id
stringlengths 9
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| abstract
stringlengths 67
2.61k
| cats
list | primary
stringlengths 5
18
| secondary
stringlengths 0
18
| strlabel
stringlengths 5
315
| stratlabel
class label 7.27k
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|---|---|---|---|---|---|---|
2202.06356
|
Most approaches for goal recognition rely on specifications of the possible
dynamics of the actor in the environment when pursuing a goal. These
specifications suffer from two key issues. First, encoding these dynamics
requires careful design by a domain expert, which is often not robust to noise
at recognition time. Second, existing approaches often need costly real-time
computations to reason about the likelihood of each potential goal. In this
paper, we develop a framework that combines model-free reinforcement learning
and goal recognition to alleviate the need for careful, manual domain design,
and the need for costly online executions. This framework consists of two main
stages: Offline learning of policies or utility functions for each potential
goal, and online inference. We provide a first instance of this framework using
tabular Q-learning for the learning stage, as well as three measures that can
be used to perform the inference stage. The resulting instantiation achieves
state-of-the-art performance against goal recognizers on standard evaluation
domains and superior performance in noisy environments.
|
[
"cs.AI",
"cs.LG"
] |
cs.AI
|
cs.LG
|
Artificial Intelligence;Machine Learning
| 421Artificial Intelligence;Machine Learning
|
1409.4927
|
One fascinating aspect of the brain is its ability to process information in
a fast and reliable manner. The functional architecture is thought to play a
central role in this task, by encoding efficiently complex stimuli and
facilitating higher level processing. In the early visual cortex of higher
mammals, information is processed within functional maps whose layout is
thought to underlie visual perception. The possible principles underlying the
topology of the different maps, as well as the role of a specific functional
architecture on information processing, is however poorly understood. We
demonstrate mathematically here that two natural principles, local exhaustivity
of representation and parsimony, would constrain the orientation and spatial
frequency maps to display co-located singularities around which the orientation
is organized as a pinwheel and spatial frequency as a dipole. This observation
is perfectly in line with new optical imaging data on the cat visual cortex we
analyze in a companion paper. Here we further focus on the theoretical
implications of this structure. Using a computational model, we show that this
architecture allows a trade-off in the local perception of orientation and
spatial frequency, but this would occur for sharper selectivity than the tuning
width reported in the literature. We therefore re-examined physiological data
and show that indeed the spatial frequency selectivity substantially sharpens
near maps singularities, bringing to the prediction that the system tends to
optimize balanced detection between different attributes. These results shed
new light on the principles at play in the emergence of functional architecture
of cortical maps, as well as their potential role in processing information.
|
[
"q-bio.NC",
"physics.bio-ph"
] |
q-bio.NC
|
physics.bio-ph
|
Neurons and Cognition;Biological Physics
| 4,815Neurons and Cognition;Biological Physics
|
1609.02894
|
We present the first measurements of long-range angular correlations and the
transverse momentum dependence of elliptic flow $v_2$ in high-multiplicity
$p$$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV. A comparison of these
results with previous measurements in high-multiplicity $d$$+$Au and $^3{\rm
He}$$+$Au collisions demonstrates a relation between $v_2$ and the initial
collision eccentricity $\varepsilon_2$, suggesting that the observed
momentum-space azimuthal anisotropies in these small systems have a collective
origin and reflect the initial geometry. Good agreement is observed between the
measured $v_2$ and hydrodynamic calculations for all systems, and an argument
disfavoring theoretical explanations based on momentum-space domain
correlations is presented. The set of measurements presented here allows us to
leverage the distinct intrinsic geometry of each of these systems to
distinguish between different theoretical descriptions of the long-range
correlations observed in small collision systems.
|
[
"nucl-ex"
] |
nucl-ex
|
Nuclear Experiment
| 4,855Nuclear Experiment
|
|
1805.05861
|
We study Phragm\'en-Lindel\"of properties of viscosity solutions to a class
of doubly nonlinear parabolic equations in $\mathbb{R}^n\times (0,T)$. We also
include an application to some doubly nonlinear equations.
|
[
"math.AP"
] |
math.AP
|
Analysis of PDEs
| 205Analysis of PDEs
|
|
1712.01233
|
A computing platform based on low temperature superconductors (LTS) has
already been proven both theoretically and experimentally. However, qubits
based on high Tc superconductors (HTS) are not yet well understood. Here we
study the Andreev bounds states (ABS) in the later materials in order to show
that a formal correspondence exists between the Mathieu levels in a Cooper Pair
Box qubit built with LTS and the Andreev levels in HTS junctions.
|
[
"quant-ph",
"cond-mat.supr-con"
] |
quant-ph
|
cond-mat.supr-con
|
Quantum Physics;Superconductivity
| 6,210Quantum Physics;Superconductivity
|
2110.08631
|
Neural systems are well known for their ability to learn and store
information as memories. Even more impressive is their ability to abstract
these memories to create complex internal representations, enabling advanced
functions such as the spatial manipulation of mental representations. While
recurrent neural networks (RNNs) are capable of representing complex
information, the exact mechanisms of how dynamical neural systems perform
abstraction are still not well-understood, thereby hindering the development of
more advanced functions. Here, we train a 1000-neuron RNN -- a reservoir
computer (RC) -- to abstract a continuous dynamical attractor memory from
isolated examples of dynamical attractor memories. Further, we explain the
abstraction mechanism with new theory. By training the RC on isolated and
shifted examples of either stable limit cycles or chaotic Lorenz attractors,
the RC learns a continuum of attractors, as quantified by an extra Lyapunov
exponent equal to zero. We propose a theoretical mechanism of this abstraction
by combining ideas from differentiable generalized synchronization and feedback
dynamics. Our results quantify abstraction in simple neural systems, enabling
us to design artificial RNNs for abstraction, and leading us towards a neural
basis of abstraction.
|
[
"cs.NE",
"nlin.CD"
] |
cs.NE
|
nlin.CD
|
Neural and Evolutionary Computing;Chaotic Dynamics
| 7,267longtail
|
1512.06799
|
We discuss some consistency tests that must be passed for a successful
explanation of a diphoton excess at larger mass scales, generated by a scalar
or pseudoscalar state, possibly of a composite nature, decaying to two photons.
Scalar states at mass scales above the electroweak scale decaying significantly
into photon final states generically lead to modifications of Standard Model
Higgs phenomenology. We characterise this effect using the formalism of
Effective Field Theory (EFT) and study the modification of the effective
couplings to photons and gluons of the Higgs. The modification of Higgs
phenomenology comes about in a variety of ways. For scalar $0^+$states, the
Higgs and the heavy boson can mix. Lower energy phenomenology gives a limit on
the mixing angle, which gets generated at one loop in any such theory
explaining the diphoton excess. Even if the mixing angle is set to zero, we
demonstrate that a relation exists between lower energy Higgs data and a
massive scaler decaying to diphoton final states. If the new boson is a
pseudoscalar, we note that if it is composite, it is generic to have an excited
scalar partner that can mix with the Higgs, which has a stronger coupling to
photons. In the case of a pseudoscalar, we also characterize how lower energy
Higgs phenomenology is directly modified using EFT, even without assuming a
scalar partner of the pseudoscalar state. We find that naturalness concerns can
be accommodated, and that pseudoscalar models are more protected from lower
energy constraints.
|
[
"hep-ph"
] |
hep-ph
|
High Energy Physics - Phenomenology
| 3,129High Energy Physics - Phenomenology
|
|
1801.00971
|
Semiconductor Bi$_2$O$_2$Se nanolayers of high crystal quality have been
realized via epitaxial growth. These two-dimensional (2D) materials possess
excellent electron transport properties with potential application in
nanoelectronics. It is also strongly expected that the 2D Bi$_2$O$_2$Se
nanolayers could be of an excellent material platform for developing spintronic
and topological quantum devices, if the presence of strong spin-orbit
interaction in the 2D materials can be experimentally demonstrated. Here, we
report on experimental determination of the strength of spin-orbit interaction
in Bi$_2$O$_2$Se nanoplates through magnetotransport measurements. The
nanoplates are epitaxially grown by chemical vapor deposition and the
magnetotransport measurements are performed at low temperatures. The measured
magnetoconductance exhibits a crossover behavior from weak antilocalization to
weak localization at low magnetic fields with increasing temperature or
decreasing back gate voltage. We have analyzed this transition behavior of the
magnetoconductance based on an interference theory which describes the quantum
correction to the magnetoconductance of a 2D system in the presence of
spin-orbit interaction. Dephasing length and spin relaxation length are
extracted from the magnetoconductance measurements. Comparing to other
semiconductor nanostructures, the extracted relatively short spin relaxation
length of ~150 nm indicates the existence of strong spin-orbit interaction in
Bi$_2$O$_2$Se nanolayers.
|
[
"cond-mat.mes-hall"
] |
cond-mat.mes-hall
|
Mesoscale and Nanoscale Physics
| 4,450Mesoscale and Nanoscale Physics
|
|
cond-mat/9810396
|
We show that, in second-order phase transformations induced by an
inhomogeneous quench, the density of topological defects is drastically
suppressed as the velocity with which the quench propagates becomes smaller
than the speed at which the front of the broken symmetry phase spreads. The
velocity of the broken symmetry phase front is approximately given by the ratio
of the healing length to relaxation time at freeze-out, that is at the instant
when the critical slowing down results in a transition from the adiabatic to
the impulse behavior in the order parameter. Experimental implications are
briefly discussed.
|
[
"cond-mat",
"gr-qc",
"hep-ph",
"quant-ph"
] |
cond-mat
|
gr-qc
|
Condensed Matter;General Relativity and Quantum Cosmology;High Energy Physics - Phenomenology;Quantum Physics
| 7,267longtail
|
1407.2376
|
We analyse the consequences of a disformal interaction between a massless
scalar and matter particles in the context of atomic physics. We focus on the
displacement of the atomic energy levels that it induces, and in particular the
change in the Lamb shift between the 2s and 2p states. We find that the
correction to the Lamb shift depends on the mass of the fermion orbiting around
the nucleus, implying a larger effect for muonic atoms. Taking the cut-off
scale describing the effective scalar field theory close to the QCD scale, we
find that the disformal interaction can account for the observed difference in
the proton radius of muonic versus electronic Hydrogen. Explaining the proton
radius puzzle is only possible when the scalar field is embedded in non-linear
theories which alleviate constraints from collider and stellar physics. Short
distance properties of the Galileon where non-perturbative effects in vacuum
are present ensure that unitarity is preserved in high energy particle
collisions. In matter, the chameleon mechanism alleviates the constraints on
disformal interactions coming from the burning rates for stellar objects. We
show how to combine these two properties in a single model which renders the
proposed explanation of the proton radius puzzle viable.
|
[
"hep-ph",
"astro-ph.CO",
"hep-th"
] |
hep-ph
|
astro-ph.CO
|
High Energy Physics - Phenomenology;Cosmology and Nongalactic Astrophysics;High Energy Physics - Theory
| 3,176High Energy Physics - Phenomenology;Cosmology and Nongalactic Astrophysics;High Energy Physics - Theory
|
2006.08737
|
We develop a distributed second order optimization algorithm that is
communication-efficient as well as robust against Byzantine failures of the
worker machines. We propose COMRADE (COMunication-efficient and Robust
Approximate Distributed nEwton), an iterative second order algorithm, where the
worker machines communicate only once per iteration with the center machine.
This is in sharp contrast with the state-of-the-art distributed second order
algorithms like GIANT [34] and DINGO[7], where the worker machines send
(functions of) local gradient and Hessian sequentially; thus ending up
communicating twice with the center machine per iteration. Moreover, we show
that the worker machines can further compress the local information before
sending it to the center. In addition, we employ a simple norm based
thresholding rule to filter-out the Byzantine worker machines. We establish the
linear-quadratic rate of convergence of COMRADE and establish that the
communication savings and Byzantine resilience result in only a small
statistical error rate for arbitrary convex loss functions. To the best of our
knowledge, this is the first work that addresses the issue of Byzantine
resilience in second order distributed optimization. Furthermore, we validate
our theoretical results with extensive experiments on synthetic and benchmark
LIBSVM [5] data-sets and demonstrate convergence guarantees.
|
[
"cs.LG",
"cs.DC",
"math.OC",
"stat.ML"
] |
cs.LG
|
cs.DC
|
Machine Learning;Distributed, Parallel, and Cluster Computing;Optimization and Control;Machine Learning
| 4,123Machine Learning;Distributed, Parallel, and Cluster Computing;Optimization and Control;Machine Learning
|
1210.1043
|
In this Letter we report on the results of our search for photons from a U(1)
gauge factor in the hidden sector of the full theory. With our experimental
setup we observe the single spectrum in a HPGe detector arising as a result of
the photoelectric-like absorption of hidden photons emitted from the Sun on
germanium atoms inside the detector. The main ingredient of the theory used in
our analysis, a severely constrained kinetic mixing from the two U(1) gauge
factors and massive hidden photons, entails both photon into hidden state
oscillations and a minuscule coupling of hidden photons to visible matter, of
which the latter our experimental setup has been designed to observe. On a
theoretical side, full account was taken of the effects of refraction and
damping of photons while propagating in Sun's interior as well as in the
detector. We exclude hidden photons with kinetic couplings chi > (2.2 x
10^{-13}- 3 x 10^{-7}) in the mass region 0.2 eV < m_gamma' < 30 keV. Our
constraints on the mixing parameter chi in the mass region from 20 eV up to 15
keV prove even slightly better then those obtained recently by using data from
the CAST experiment, albeit still somewhat weaker than those obtained from
solar and HB stars lifetime arguments.
|
[
"hep-ex",
"hep-ph"
] |
hep-ex
|
hep-ph
|
High Energy Physics - Experiment;High Energy Physics - Phenomenology
| 3,075High Energy Physics - Experiment;High Energy Physics - Phenomenology
|
astro-ph/0106472
|
The observed clustering of ultra-high energy cosmic rays suggests the
existence of a neutral component. The models with violation of Lorentz
invariance may explain this component by neutrons becoming stable above some
threshold energy E_0. The protons, in turn, may become unstable above some
energy E_1>E_0. We calculate the dependence of the threshold energies E_0 and
E_1 on the parameters of the model and find E_1/E_0\gsim 1.5. We argue that the
characteristic threshold behavior of charged and neutral components may be used
as the specific signature of models with violation of Lorentz invariance. The
existence of the neutron stability threshold E_0 can be investigated with
already existing data.
|
[
"astro-ph"
] |
astro-ph
|
Astrophysics
| 463Astrophysics
|
|
2208.06211
|
The CUbesat Solar Polarimeter (CUSP) project aims to develop a constellation
of two CubeSats orbiting the Earth to measure the linear polarisation of solar
flares in the hard X-ray band by means of a Compton scattering polarimeter on
board of each satellite. CUSP will allow to study the magnetic reconnection and
particle acceleration in the flaring magnetic structures. CUSP is a project
approved for a Phase A study by the Italian Space Agency in the framework of
the Alcor program aimed to develop CubeSat technologies and missions.
|
[
"astro-ph.SR",
"astro-ph.IM",
"physics.space-ph"
] |
astro-ph.SR
|
astro-ph.IM
|
Solar and Stellar Astrophysics;Instrumentation and Methods for Astrophysics;Space Physics
| 6,716Solar and Stellar Astrophysics;Instrumentation and Methods for Astrophysics;Space Physics
|
0801.4215
|
In this paper we study the chiral symmetry breaking in the hard wall AdS/QCD
model. We solve the equations of motion up to the second order at large
momentum and obtain the first few terms in the expansion of the "left-right"
correlator, which is the measure of symmetry breaking. We study the dependence
on AdS radius to get the result as the series in t'Hooft constant.
|
[
"hep-th"
] |
hep-th
|
High Energy Physics - Theory
| 3,266High Energy Physics - Theory
|
|
1512.01537
|
A general approach to knowledge transfer is introduced in which an agent
controlled by a neural network adapts how it reuses existing networks as it
learns in a new domain. Networks trained for a new domain can improve their
performance by routing activation selectively through previously learned neural
structure, regardless of how or for what it was learned. A neuroevolution
implementation of this approach is presented with application to
high-dimensional sequential decision-making domains. This approach is more
general than previous approaches to neural transfer for reinforcement learning.
It is domain-agnostic and requires no prior assumptions about the nature of
task relatedness or mappings. The method is analyzed in a stochastic version of
the Arcade Learning Environment, demonstrating that it improves performance in
some of the more complex Atari 2600 games, and that the success of transfer can
be predicted based on a high-level characterization of game dynamics.
|
[
"cs.NE",
"cs.AI"
] |
cs.NE
|
cs.AI
|
Neural and Evolutionary Computing;Artificial Intelligence
| 4,762Neural and Evolutionary Computing;Artificial Intelligence
|
2106.06304
|
Finding the best configuration of algorithms' hyperparameters for a given
optimization problem is an important task in evolutionary computation. We
compare in this work the results of four different hyperparameter tuning
approaches for a family of genetic algorithms on 25 diverse pseudo-Boolean
optimization problems. More precisely, we compare previously obtained results
from a grid search with those obtained from three automated configuration
techniques: iterated racing, mixed-integer parallel efficient global
optimization, and mixed-integer evolutionary strategies.
Using two different cost metrics, expected running time and the area under
the empirical cumulative distribution function curve, we find that in several
cases the best configurations with respect to expected running time are
obtained when using the area under the empirical cumulative distribution
function curve as the cost metric during the configuration process. Our results
suggest that even when interested in expected running time performance, it
might be preferable to use anytime performance measures for the configuration
task. We also observe that tuning for expected running time is much more
sensitive with respect to the budget that is allocated to the target
algorithms.
|
[
"cs.NE"
] |
cs.NE
|
Neural and Evolutionary Computing
| 4,760Neural and Evolutionary Computing
|
|
astro-ph/0309578
|
The Petrova (2000) model to calculate pulse profiles is extended to a
variable emission height model to make it physically self-consistent. In this
context variable means that the emission height is no longer considered to be
the same for different magnetic field lines. The pulse profiles calculated
using this new model seem to be less realistic due to a focusing effect and
cannot be used to fit (typical) multifrequency pulsar observations. Apart from
the focusing effect the general morphology of pulse profiles is not greatly
affected by introducing a variable emission height. Additional extensions of
the model will be needed to be able to fit observations, and several
suggestions are made.
|
[
"astro-ph"
] |
astro-ph
|
Astrophysics
| 463Astrophysics
|
|
1411.6230
|
We investigate the magnetic field at the surface of 48 red giants selected as
promising for detection of Stokes V Zeeman signatures in their spectral lines.
We use the spectropolarimeters Narval and ESPaDOnS to detect circular
polarization within the photospheric absorption lines of our targets and use
the least-squares deconvolution (LSD) method. We also measure the classical
S-index activity indicator, and the stellar radial velocity. To infer the
evolutionary status of our giants and to interpret our results, we use
state-of-the-art stellar evolutionary models with predictions of convective
turnover times. We unambiguously detect magnetic fields via Zeeman signatures
in 29 of the 48 red giants in our sample. Zeeman signatures are found in all
but one of the 24 red giants exhibiting signs of activity, as well as 6 out of
17 bright giant stars.The majority of the magnetically detected giants are
either in the first dredge up phase or at the beginning of core He burning,
i.e. phases when the convective turnover time is at a maximum: this corresponds
to a 'magnetic strip' for red giants in the Hertzsprung-Russell diagram. A
close study of the 16 giants with known rotational periods shows that the
measured magnetic field strength is tightly correlated with the rotational
properties, namely to the rotational period and to the Rossby number Ro. Our
results show that the magnetic fields of these giants are produced by a dynamo.
Four stars for which the magnetic field is measured to be outstandingly strong
with respect to that expected from the rotational period/magnetic field
relation or their evolutionary status are interpreted as being probable
descendants of magnetic Ap stars. In addition to the weak-field giant Pollux, 4
bright giants (Aldebaran, Alphard, Arcturus, eta Psc) are detected with
magnetic field strength at the sub-gauss level.
|
[
"astro-ph.SR"
] |
astro-ph.SR
|
Solar and Stellar Astrophysics
| 6,668Solar and Stellar Astrophysics
|
|
2305.16466
|
During operation, aerial manipulation systems are affected by various
disturbances. Among them is a gravitational torque caused by the weight of the
robotic arm. Common propeller-based actuation is ineffective against such
disturbances because of possible overheating and high power consumption. To
overcome this issue, in this paper we propose a winchbased actuation for the
crane-stationed cable-suspended aerial manipulator. Three winch-controlled
suspension rigging cables produce a desired cable tension distribution to
generate a wrench that reduces the effect of gravitational torque. In order to
coordinate the robotic arm and the winch-based actuation, a model-based
hierarchical whole-body controller is adapted. It resolves two tasks: keeping
the robotic arm end-effector at the desired pose and shifting the system center
of mass in the location with zero gravitational torque. The performance of the
introduced actuation system as well as control strategy is validated through
experimental studies.
|
[
"cs.RO"
] |
cs.RO
|
Robotics
| 6,325Robotics
|
|
1202.4632
|
We calculate the linear and nonlinear conductance of spinless fermions in
clean, long quantum wires where short-ranged interactions lead locally to
equilibration. Close to the quantum phase transition where the conductance
jumps from zero to one conductance quantum, the conductance obtains an
universal form governed by the ratios of temperature, bias voltage and gate
voltage. Asymptotic analytic results are compared to solutions of a Boltzmann
equation which includes the effects of three-particle scattering. Surprisingly,
we find that for long wires the voltage predominantly drops close to one end of
the quantum wire due to a thermoelectric effect.
|
[
"cond-mat.mes-hall"
] |
cond-mat.mes-hall
|
Mesoscale and Nanoscale Physics
| 4,450Mesoscale and Nanoscale Physics
|
|
2304.13986
|
By integrating certain optimization solvers with deep neural networks, deep
unfolding network (DUN) with good interpretability and high performance has
attracted growing attention in compressive sensing (CS). However, existing DUNs
often improve the visual quality at the price of a large number of parameters
and have the problem of feature information loss during iteration. In this
paper, we propose an Optimization-inspired Cross-attention Transformer (OCT)
module as an iterative process, leading to a lightweight OCT-based Unfolding
Framework (OCTUF) for image CS. Specifically, we design a novel Dual Cross
Attention (Dual-CA) sub-module, which consists of an Inertia-Supplied Cross
Attention (ISCA) block and a Projection-Guided Cross Attention (PGCA) block.
ISCA block introduces multi-channel inertia forces and increases the memory
effect by a cross attention mechanism between adjacent iterations. And, PGCA
block achieves an enhanced information interaction, which introduces the
inertia force into the gradient descent step through a cross attention block.
Extensive CS experiments manifest that our OCTUF achieves superior performance
compared to state-of-the-art methods while training lower complexity. Codes are
available at https://github.com/songjiechong/OCTUF.
|
[
"cs.CV",
"eess.IV"
] |
cs.CV
|
eess.IV
|
Computer Vision and Pattern Recognition;Image and Video Processing
| 1,584Computer Vision and Pattern Recognition;Image and Video Processing
|
1609.09369
|
We introduce the notion of quasimonotone polar of a multivalued operator, in
a similar way as the well-known monotone polar due to Martinez-Legaz and
Svaiter.
We first recover several properties similar to the monotone polar, including
a characterization in terms of normal cones. Next, we use it to analyze certain
aspects of maximal (in the sense of graph inclusion) quasimonotonicity, and its
relation to the notion of maximal quasimonotonicity introduced by Aussel and
Eberhard.
Furthermore, we study the connections between quasimonotonicity and Minty
Variational Inequality Problems.
|
[
"math.OC"
] |
math.OC
|
Optimization and Control
| 5,234Optimization and Control
|
|
hep-th/0103003
|
This paper reports the investigation of a matrix model via super Lie algebra,
following the proposal of L. Smolin. We consider the osp(1|32,R) nongauged
matrix model and gl(1|32,R) gauged matrix model, especially paying attention to
the supersymmetry and the relationship with IKKT model. This paper is based on
the collaboration with the collaboration with S.Iso, H.Kawai and Y.Ohwashi.
|
[
"hep-th"
] |
hep-th
|
High Energy Physics - Theory
| 3,266High Energy Physics - Theory
|
|
0804.1375
|
During the summer of 2006, the accreting X-ray pulsar EXO 2030+375 underwent
its first giant outburst since its discovery in 1985. Our observations include
the first ever of the rise of a giant outburst of EXO 2030+375. EXO 2030+375
was monitored daily with the Rossi X-ray Timing Explorer (RXTE) from 2006 June
through 2007 May. During the giant outburst, we discovered evidence for a
cyclotron feature at ~11 keV. This feature was confidently detected for about
90 days, during the brighter portion of the outburst. Daily observations of the
next five EXO 2030+375 orbits detected pulsations at all orbital phases and
normal outbursts shifted to a later orbital phase than before the giant
outburst. An accretion disk appears to be present in both the normal and giant
outbursts, suggesting that the long-term behavior is a product of the state of
the Be star disk and the accretion disk. Here we will present flux and
frequency histories from our detailed RXTE observations of the giant outburst
and the normal outbursts that surrounded it. A new orbital analysis is
presented that includes observations from 1991 through 2007 August.
|
[
"astro-ph"
] |
astro-ph
|
Astrophysics
| 463Astrophysics
|
|
0712.2880
|
We present preliminary results of an ESO-VLT large programme (AMAZE) aimed at
determining the evolution of the mass-metallicity relation at z~3 by means of
deep near-IR spectroscopy. Gas metallicities and stellar masses are measured
for an initial sample of nine star forming galaxies at z~3.3. When compared
with previous surveys, the mass-metallicity relation inferred at z~3.3 shows an
evolution significantly stronger than observed at lower redshifts. There are
also some indications that the metallicity evolution of low mass galaxies is
stronger relative to high mass systems, an effect which can be considered as
the chemical version of the galaxy downsizing. The mass-metallicity relation
observed at z~3.3 is difficult to reconcile with the predictions of some
hierarchical evolutionary models. We shortly discuss the possible implications
of such discrepancies.
|
[
"astro-ph"
] |
astro-ph
|
Astrophysics
| 463Astrophysics
|
|
1309.6211
|
Let $\Omega \subset \mathbb{R}^n$ be a convex. If $u: \Omega \rightarrow
\mathbb{R}$ has mean 0, then we have the classical Poincar\'{e} inequality $$
\|u \|_{L^p} \leq c_p \mbox{diam}(\Omega) \| \nabla u \|_{L^p}$$ with sharp
constants $c_2 = 1/\pi$ (Payne \& Weinberger, 1960) and $c_1 = 1/2$ (Acosta \&
Duran, 2005) independent of the dimension. The sharp constants $c_p$ for $1 < p
< 2$ have recently been found by Ferone, Nitsch \& Trombetti (2012). The
purpose of this short paper is to prove a much stronger inequality in the
endpoint $L^1$: we combine results of Cianchi and Kannan, Lov\'{a}sz \&
Simonovits to show that $$\left\|u\right\|_{L^{1}(\Omega)} \leq
\frac{2}{\log{2}} M_{}(\Omega) \left\|\nabla u\right\|_{L^{1}(\Omega)}$$ where
$M_{}(\Omega)$ is the average distance between a point in $\Omega$ and the
center of gravity of $\Omega$. If $\Omega$ is a simplex, this yields an
improvement by a factor of $\sim \sqrt{n}$ in $n$ dimensions. By interpolation,
this implies that that for every convex $\Omega \subset \mathbb{R}^n$ and every
$u:\Omega \rightarrow \mathbb{R}$ with mean 0 $$
\left\|u\right\|_{L^{p}(\Omega)}\leq \left(\frac{2}{\log{2}} M_{}(\Omega)
\right)^{\frac{1}{p}}\mbox{diam}(\Omega)^{1-\frac{1}{p}}\left\|\nabla
u\right\|_{L^{p}(\Omega)}. $$
|
[
"math.CA",
"math.AP",
"math.MG"
] |
math.CA
|
math.AP
|
Classical Analysis and ODEs;Analysis of PDEs;Metric Geometry
| 940Classical Analysis and ODEs;Analysis of PDEs;Metric Geometry
|
1410.2432
|
The effect of an atomically sharp impenetrable interface on the spin
splitting of the spectrum of two-dimensional electrons in heterostructures
based on (001) III-V compounds has been analyzed. To this end, the single band
Hamiltonian $\Gamma_{6c}$ for envelope functions is supplemented by a general
boundary condition taking into account the possibility of the existence of Tamm
states. This boundary condition also takes into account the spin-orbit
interaction, the asymmetry of a quantum well, and the lack of inversion
symmetry in the crystal and contains the single phenomenological length $R$
characterizing the structure of the interface at atomic scales. The model of a
quasitriangular well created by the electric field $F$ has been considered.
After the unitary transformation to zero boundary conditions, in the modified
Hamiltonian interfacial contribution appears, from which the two-dimensional
spin Hamiltonian is obtained through averaging over the fast motion along the
normal. In the absence of magnetic field $\boldsymbol B$, this contribution is
the sum of the Dresselhaus and the Bychkov-Rashba terms with the constants
renormalized owing to the interfacial contribution. In the field $\boldsymbol
B$ containing the quantizing component $B_z$, the off - diagonal (in cubic
axes) components of the $g$-factor tensor are linear functions of $|B_z|$ and
the number of the Landau level $N$. The results are in qualitative agreement
with the experimental data.
|
[
"cond-mat.mes-hall"
] |
cond-mat.mes-hall
|
Mesoscale and Nanoscale Physics
| 4,450Mesoscale and Nanoscale Physics
|
|
2301.08538
|
In this article we study certain notions of `tameness' for the persistence
modules studied in topological data analysis. In particular, we show that after
adding infinitary points the so called finitely determined modules become
finitely presented.
|
[
"math.AT",
"math.AC"
] |
math.AT
|
math.AC
|
Algebraic Topology;Commutative Algebra
| 177Algebraic Topology;Commutative Algebra
|
1402.3268
|
We derive physical properties of 10 submillimeter galaxies located in the
CANDELS coverage of the GOODS-S field. The galaxies were first identified as
submillimeter sources with the LABOCA bolometer and subsequently targeted for
870um continuum observation with ALMA. The high angular resolution of the ALMA
imaging allows secure counterparts to be identified in the CANDELS multiband
dataset. The CANDELS data provide deep photometric data from UV through
near-infrared wavelengths. Using synthetic spectral energy distributions, we
derive photometric redshifts, stellar masses, extinction, ages, and the star
formation history. The redshift range is z=1.65-4.76, with two of the galaxies
located at z>4. Two SMG counterparts have stellar masses 2-3 orders of
magnitude lower than the rest. The remaining SMG counterparts have stellar
masses around 1x10^11 Msun. The stellar population in the SMGs is typically
older than the expected duration of the submillimeter phase, suggesting that
the star formation history of submillimeter galaxies is more complex than a
single burst. Non-parametric morphology indices suggest that the SMG
counterparts are among the most asymmetric systems compared with galaxies of
the same stellar mass and redshift. The HST images shows that 3 of the SMGs are
associated with on-going mergers. The remaining counterparts are isolated.
Estimating the dust and molecular gas mass from the submm fluxes, and comparing
with our stellar masses shows that the molecular gas mass fraction of SMGs is
~28% and that the final stellar mass is likely to be (1-2)x10^11 Msun.
|
[
"astro-ph.GA",
"astro-ph.CO"
] |
astro-ph.GA
|
astro-ph.CO
|
Astrophysics of Galaxies;Cosmology and Nongalactic Astrophysics
| 470Astrophysics of Galaxies;Cosmology and Nongalactic Astrophysics
|
astro-ph/0112156
|
The physics of gamma-ray bursts (GRBs) and their offsets from the centers of
their host galaxies are used to investigate the evolutionary state of their
progenitors, motivated by the popular idea that GRBs are linked with the
cataclysmic collapse of massive stars. We suggest that GRB progenitors in the
inner and outer regions of hosts may be intrinsically different: outer bursts
appear to have systematically greater isotropic equivalent energies (or
narrower jets). This may provide an interesting clue to the nature of GRBs, and
could reflect a relation between metallicity and the evolution of GRB
progenitors. If true, then this offset-isotropic luminosity correlation is a
strong argument for a collapsar origin of long-duration GRBs.
|
[
"astro-ph"
] |
astro-ph
|
Astrophysics
| 463Astrophysics
|
|
2205.11595
|
When a large number of similar entities interact among each other and with
their environment at a low scale, unexpected outcomes at higher spatio-temporal
scales might spontaneously arise. This nontrivial phenomenon, known as
emergence, characterizes a broad range of distinct complex systems -- from
physical to biological and social ones -- and is often related to collective
behavior. It is ubiquitous, from non-living entities such as oscillators that
under specific conditions synchronize, to living ones, such as birds flocking
or fish schooling. Despite the ample phenomenological evidence of the existence
of systems' emergent properties, central theoretical questions to the study of
emergence remain still unanswered, such as the lack of a widely accepted,
rigorous definition of the phenomenon or the identification of the essential
physical conditions that favour emergence. We offer here a general overview of
the phenomenon of emergence and sketch current and future challenges on the
topic. Our short review also serves as an introduction to the Theme Issue
"Emergent phenomena in complex physical and socio-technical systems: from cells
to societies", where we provide a synthesis of the contents tackled in the
Issue and outline how they relate to these challenges, spanning from current
advances in our understanding on the origin of life to the large-scale
propagation of infectious diseases.
|
[
"physics.soc-ph",
"cond-mat.stat-mech"
] |
physics.soc-ph
|
cond-mat.stat-mech
|
Physics and Society;Statistical Mechanics
| 5,540Physics and Society;Statistical Mechanics
|
2103.11494
|
Despite the undeniable success of the Standard Model of particle physics
(SM), there are some phenomena that the SM can't explain. These phenomena
indicate that the SM has to be modified. One of the possible ways to extend the
SM is to introduce heavy neutral leptons (HNLs). To search for HNLs in
intensity frontier experiments, one has to consider HNL production both in
2-body and 3-body decays of some mesons. We verified the possibility of using
the parton level PYTHIA default matrix elements (without the form-factor
formalism) to calculate HNL production in 3-body semileptonic decays of $B$ and
$D$ mesons in the experimentally interesting mass range of the produced HNLs.
We conclude that this approach is quite suitable for the estimation of the
sensitivity region for HNLs in the intensity frontier experiments, provided one
uses suitable parton level PYTHIA default matrix elements. Our study was driven
by the usage of such an approximation by the SHiP collaboration. We conclude
that in this case the parton level PYTHIA default matrix elements could have
been chosen more appropriately.
|
[
"hep-ph"
] |
hep-ph
|
High Energy Physics - Phenomenology
| 3,129High Energy Physics - Phenomenology
|
|
2005.05446
|
The apparent lack of massive O-type stars near the zero-age main sequence (at
ages < 2 Myr) is a topic widely discussed. Different explanations for this
elusive detection have been proposed, but no firm conclusions have been reached
yet. We reassess this empirical result benefiting from the high-quality
spectroscopic observations of >400 Galactic O-type stars gathered by the IACOB
and OWN surveys. We used temperatures and gravities from a iacob-gbat/fastwind
spectroscopic analysis to locate our sample in the Kiel and spectroscopic HR
diagrams. We evaluated the completeness of our sample of stars, observational
biases using information from the Galactic O star catalog (GOSC), systematics
of our methodology, and compare with other recent studies using smaller samples
of Galactic O-type stars. We base our discussion on the spectroscopic HR
diagram to avoid the use of uncertain distances. We performed a detailed study
of the young cluster Trumpler-14 as an example of how Gaia cluster distances
can help to construct the associated classical HR diagram. The apparent lack of
massive O-type stars near the ZAMS with masses between 30 and 70 Msol persist
even when spectroscopic results from a large, non-biased sample of stars are
used. We do not find correlation between the dearth of stars and observational
biases, limitations of our methodology, or the use of spectroscopic HR diagram
instead of the classical one. Investigating the efficiency of mass accretion
during the formation process we conclude that an adjustment of the accretion
rate towards lower values could reconcile the hotter boundary of detected
O-type stars and the theoretical birthline. Last, we discuss that the presence
of a small sample of O2-O3.5 stars found closer to the ZAMS might be explained
taking into account non-standard star evolution (e.g. binary interaction,
mergers, or homogeneous evolution).
|
[
"astro-ph.SR"
] |
astro-ph.SR
|
Solar and Stellar Astrophysics
| 6,668Solar and Stellar Astrophysics
|
|
1011.2992
|
We live near a magnetic star whose cycles of activity are driven by dynamo
action beneath the surface. In the solar convection zone, rotation couples with
plasma motions to build highly organized magnetic fields that erupt at the
surface and undergo relatively regular cycles of polarity reversal. Despite our
proximity to the Sun, the nature of its dynamo remains elusive, but
observations of other solar-type stars show that surface magnetism is a nearly
ubiquitous feature. In recent time, numerical simulations of convection and
dynamo action have taken tremendous strides forward. Global-scale organization
and cyclic magnetism are being achieved by several groups in distinctly
different solar and stellar simulations. Here I will talk about advances on the
numerical front including wreath-building dynamos which may occupy stellar
convection zones. I will discuss the interplay between the new simulations,
various classes of mean-field models, and current and upcoming solar and
stellar observations.
|
[
"astro-ph.SR"
] |
astro-ph.SR
|
Solar and Stellar Astrophysics
| 6,668Solar and Stellar Astrophysics
|
|
2210.09736
|
We introduce a Fourier-Bessel-based spectral solver for Cauchy problems
featuring Laplacians in polar coordinates under homogeneous Dirichlet boundary
conditions. We use FFTs in the azimuthal direction to isolate angular modes,
then perform discrete Hankel transform (DHT) on each mode along the radial
direction to obtain spectral coefficients. The two transforms are connected via
numerical and cardinal interpolations. We analyze the boundary-dependent error
bound of DHT; the worst case is $\sim N^{-3/2}$, which governs the method, and
the best $\sim e^{-N}$, which then the numerical interpolation governs. The
complexity is $O[N^3]$. Taking advantage of Bessel functions being the
eigenfunctions of the Laplacian operator, we solve linear equations for all
times. For non-linear equations, we use a time-splitting method to integrate
the solutions. We show examples and validate the method on the two-dimensional
wave equation, which is linear, and on two non-linear problems: a
time-dependent Poiseuille flow and the flow of a Bose-Einstein condensate on a
disk.
|
[
"physics.comp-ph",
"cond-mat.quant-gas",
"cs.NA",
"math.NA",
"physics.flu-dyn"
] |
physics.comp-ph
|
cond-mat.quant-gas
|
Computational Physics;Quantum Gases;Numerical Analysis;Numerical Analysis;Fluid Dynamics
| 7,267longtail
|
1810.00280
|
The ABALONE Photosensor Technology (U.S. Pat. 9064678) is a modern, scalable
technology specifically invented for cost effective mass production,
robustness, and high performance. We present the performance of advanced fused
silica ABALONE Photosensors, developed specifically for the potential extension
of the Ice Cube neutrino experiment, and stress tested for 120 days. The
resulting performance makes a significant difference: intrinsic gain in the
high 100 million range, total afterpulsing rate of only 0.005 ions per
photoelectron, subnanosecond timing resolution, single photon sensitivity, and
unique radiopurity and UV sensitivity, thanks to the fused silica components,
at no additional cost to the assembly process.
|
[
"physics.ins-det",
"astro-ph.HE",
"hep-ex",
"nucl-ex"
] |
physics.ins-det
|
astro-ph.HE
|
Instrumentation and Detectors;High Energy Astrophysical Phenomena;High Energy Physics - Experiment;Nuclear Experiment
| 7,267longtail
|
2011.07359
|
The proliferation of smartphones has led to the increased popularity of
location-based search and recommendation systems. Online platforms like Google
and Yelp allow location-based search in the form of nearby feature to query for
hotels or restaurants in the vicinity. Moreover, hotel booking platforms like
Booking[dot]com, Expedia, or Trivago allow travelers searching for
accommodations using either their desired location as a search query or near a
particular landmark. Since the popularity of different locations in a city
varies, certain locations may get more queries than other locations. Thus, the
exposure received by different establishments at these locations may be very
different from their intrinsic quality as captured in their ratings.
Today, many small businesses (shops, hotels, or restaurants) rely on such
online platforms for attracting customers. Thus, receiving less exposure than
that is expected can be unfavorable for businesses. It could have a negative
impact on their revenue and potentially lead to economic starvation or even
shutdown. By gathering and analyzing data from three popular platforms, we
observe that many top-rated hotels and restaurants get less exposure vis-a-vis
their quality, which could be detrimental for them. Following a meritocratic
notion, we define and quantify such exposure disparity due to location-based
searches on these platforms. We attribute this exposure disparity mainly to two
kinds of biases -- Popularity Bias and Position Bias. Our experimental
evaluation on multiple datasets reveals that although the platforms are doing
well in delivering distance-based results, exposure disparity exists for
individual businesses and needs to be reduced for business sustainability.
|
[
"cs.IR"
] |
cs.IR
|
Information Retrieval
| 3,577Information Retrieval
|
|
astro-ph/9811259
|
We present first results of three-dimensional (3D-) calculations of turbulent
and degenerate hydrogen-burning on top of a C+O white dwarf of one solar mass.
The simulations are carried out by means of a code which solves Euler's
equation for an arbitrary equation of state together with a nuclear reaction
network and the energy input from nuclear reactions on a Cartesian grid
covering a fraction of the white dwarf's surface and accreted atmosphere. The
flow patterns we obtain are very different from those of earlier 2D simulations
using the same initial conditions and the same numerical resolution. The
possibility of self-enrichment of the accreted hydrogen-rich atmosphere with
carbon and oxygen from the surface layers of the white dwarf during the violent
phase of the burning is investigated, and it is demonstrated that
self-enrichment proceeds too slowly if the accreted gas has near-solar
CNO-abundances at the onset of the thermonuclear runaway. As a result, we do
not find a fast nova outburst. This conclusion remains valid if the initial
metallicity of the accreted gas is raised by a factor of five. Therefore we
conclude that fast nova outbursts indeed require huge enrichments of C and O,
as postulated from spherically symmetric models, and that the mechanism which
leads to such enhancements must operate prior to the outburst.
|
[
"astro-ph"
] |
astro-ph
|
Astrophysics
| 463Astrophysics
|
|
1705.00442
|
Graph filters play a key role in processing the graph spectra of signals
supported on the vertices of a graph. However, despite their widespread use,
graph filters have been analyzed only in the deterministic setting, ignoring
the impact of stochastic- ity in both the graph topology as well as the signal
itself. To bridge this gap, we examine the statistical behavior of the two key
filter types, finite impulse response (FIR) and autoregressive moving average
(ARMA) graph filters, when operating on random time- varying graph signals (or
random graph processes) over random time-varying graphs. Our analysis shows
that (i) in expectation, the filters behave as the same deterministic filters
operating on a deterministic graph, being the expected graph, having as input
signal a deterministic signal, being the expected signal, and (ii) there are
meaningful upper bounds for the variance of the filter output. We conclude the
paper by proposing two novel ways of exploiting randomness to improve (joint
graph-time) noise cancellation, as well as to reduce the computational
complexity of graph filtering. As demonstrated by numerical results, these
methods outperform the disjoint average and denoise algorithm, and yield a (up
to) four times complexity redution, with very little difference from the
optimal solution.
|
[
"cs.SY"
] |
cs.SY
|
Systems and Control
| 7,149Systems and Control
|
|
2103.07765
|
This research recasts the network attack dataset from UNSW-NB15 as an
intrusion detection problem in image space. Using one-hot-encodings, the
resulting grayscale thumbnails provide a quarter-million examples for deep
learning algorithms. Applying the MobileNetV2's convolutional neural network
architecture, the work demonstrates a 97% accuracy in distinguishing normal and
attack traffic. Further class refinements to 9 individual attack families
(exploits, worms, shellcodes) show an overall 56% accuracy. Using feature
importance rank, a random forest solution on subsets show the most important
source-destination factors and the least important ones as mainly obscure
protocols. The dataset is available on Kaggle.
|
[
"cs.CR",
"cs.LG"
] |
cs.CR
|
cs.LG
|
Cryptography and Security;Machine Learning
| 1,835Cryptography and Security;Machine Learning
|
2311.01974
|
New characterizations of the disjoint Dunford-Pettis property of order $p$
(disjoint $DPP_p$) are proved and applied to show that a Banach lattice of
cotype $p$ has the disjoint $DPP_p$ whenever its dual has this property. The
disjoint Dunford-Pettis$^*$ property of order $p$ (disjoint $DP^*P_p$) is
thoroughly investigated. Close connections with the positive Schur property of
order $p$, with the disjoint $DPP_p$, with the $p$-weak $DP^*$ property and
with the positive $DP^*$ property of order $p$ are established. In a final
section we study the polynomial versions of the disjoint $DPP_p$ and of the
disjoint $DP^*P_p$.
|
[
"math.FA"
] |
math.FA
|
Functional Analysis
| 2,549Functional Analysis
|
|
1001.1273
|
The problem of the fluctuation of the Longest Common Subsequence (LCS) of two
i.i.d. sequences of length $n>0$ has been open for decades. There exist
contradicting conjectures on the topic. Chvatal and Sankoff conjectured in 1975
that asymptotically the order should be $n^{2/3}$, while Waterman conjectured
in 1994 that asymptotically the order should be $n$. A contiguous substring
consisting only of one type of symbol is called a block. In the present work,
we determine the order of the fluctuation of the LCS for a special model of
sequences consisting of i.i.d. blocks whose lengths are uniformly distributed
on the set $\{l-1,l,l+1\}$, with $l$ a given positive integer. We showed that
the fluctuation in this model is asymptotically of order $n$, which confirm
Waterman's conjecture. For achieving this goal, we developed a new method which
allows us to reformulate the problem of the order of the variance as a
(relatively) low dimensional optimization problem.
|
[
"math.PR",
"math.CO"
] |
math.PR
|
math.CO
|
Probability;Combinatorics
| 5,726Probability;Combinatorics
|
1912.11987
|
The essential matrix incorporates relative rotation and translation
parameters of two calibrated cameras. The well-known algebraic characterization
of essential matrices, i.e. necessary and sufficient conditions under which an
arbitrary matrix (of rank two) becomes essential, consists of a unique matrix
equation of degree three. Based on this equation, a number of efficient
algorithmic solutions to different relative pose estimation problems have been
proposed. In three views, a possible way to describe the geometry of three
calibrated cameras comes from considering compatible triplets of essential
matrices. The compatibility is meant the correspondence of a triplet to a
certain configuration of calibrated cameras. The main goal of this paper is to
give an algebraic characterization of compatible triplets of essential
matrices. Specifically, we propose necessary and sufficient polynomial
constraints on a triplet of real rank-two essential matrices that ensure its
compatibility. The constraints are given in the form of six cubic matrix
equations, one quartic and one sextic scalar equations. An important advantage
of the proposed constraints is their sufficiency even in the case of cameras
with collinear centers. The applications of the constraints may include
relative camera pose estimation in three and more views, averaging of essential
matrices for incremental structure from motion, multiview camera
auto-calibration, etc.
|
[
"cs.CV"
] |
cs.CV
|
Computer Vision and Pattern Recognition
| 1,498Computer Vision and Pattern Recognition
|
|
nlin/0101055
|
We present a new semiclassical technique which relies on replacing
complicated classical manifold structure with simpler manifolds, which are then
evaluated by the usual semiclassical rules. Under circumstances where the
original manifold structure gives poor or useless results semiclassically the
replacement manifolds can yield remarkable accuracy. We give several working
examples to illustrate the theory presented here.
|
[
"nlin.CD",
"quant-ph"
] |
nlin.CD
|
quant-ph
|
Chaotic Dynamics;Quantum Physics
| 852Chaotic Dynamics;Quantum Physics
|
2101.12174
|
We extend the work of Salberger; Walsh; Castryck, Cluckers, Dittmann and
Nguyen; and Vermeulen to prove the uniform dimension growth conjecture of
Heath-Brown and Serre for varieties of degree at least $4$ over global fields.
As an intermediate step, we generalize the bounds of Bombieri and Pila to
curves over global fields and in doing so we improve the $B^{\varepsilon}$
factor by a $\log(B)$ factor.
|
[
"math.NT",
"math.AG"
] |
math.NT
|
math.AG
|
Number Theory;Algebraic Geometry
| 4,946Number Theory;Algebraic Geometry
|
2210.16269
|
Executing large test suites is time and resource consuming, sometimes
impossible, and such test suites typically contain many redundant test cases.
Hence, test case minimization is used to remove redundant test cases that are
unlikely to detect new faults. However, most test case (suite) minimization
techniques rely on code coverage (white-box), model-based features, or
requirements specifications, which are not always accessible by test engineers.
Recently, a set of novel techniques was proposed, called FAST-R, relying solely
on test case code for test case minimization, which appeared to be much more
efficient than white-box techniques. However, it achieved a comparable low
fault detection capability for Java projects, making its application
challenging in practice. This paper proposes ATM (AST-based Test case
Minimizer), a similarity-based, search-based test case minimization technique,
taking a specific budget as input, that also relies exclusively on the source
code of test cases but attempts to achieve higher fault detection through
finer-grained similarity analysis and a dedicated search algorithm. ATM
transforms test case code into Abstract Syntax Trees (AST) and relies on four
tree-based similarity measures to apply evolutionary search, specifically
genetic algorithms, to minimize test cases. We evaluated the effectiveness and
efficiency of ATM on a large dataset of 16 Java projects with 661 faulty
versions using three budgets ranging from 25% to 75% of test suites. ATM
achieved significantly higher fault detection rates (0.82 on average), compared
to FAST-R (0.61 on average) and random minimization (0.52 on average), when
running only 50% of the test cases, within practically acceptable time (1.1-4.3
hours, on average), given that minimization is only occasionally applied when
many new test cases are created (major releases). Results achieved for other
budgets were consistent.
|
[
"cs.SE"
] |
cs.SE
|
Software Engineering
| 6,626Software Engineering
|
|
2304.09198
|
We develop a framework for self-consistently extracting cosmological
information from the clustering of tracers in redshift space,
$\textit{without}$ relying on model-dependent templates to describe the baryon
acoustic oscillation (BAO) feature. Our approach uses the recently proposed
Laguerre reconstruction technique for the BAO feature and its linear point
$r_{\rm LP}$, and substantially extends it to simultaneously model the
multipoles $\ell=0,2,4$ of the anisotropic galaxy 2-point correlation function
(2pcf). The approach is `model-agnostic': it assumes that the non-linear growth
of structure smears the BAO feature by an approximately Gaussian kernel with a
smearing scale $\sigma_{\rm v}$, but does not assume any fiducial cosmology for
describing the shape of the feature itself. Using mock observations for two
realistic survey configurations assuming $\Lambda$ cold dark matter
($\Lambda$CDM), combined with Bayesian parameter inference, we show that the
linear point $r_{\rm LP}$ and smearing scale $\sigma_{\rm v}$ can be accurately
recovered by our method in both existing and upcoming surveys. The precision of
the recovery of $r_{\rm LP}$ is always better than $1\%$, while $\sigma_{\rm
v}$ can be recovered with $\lesssim10\%$ uncertainty provided the linear galaxy
bias $b$ is separately constrained, e.g., using weak lensing observations. Our
method is also sensitive to the linear growth rate $f$, albeit with larger
uncertainties and systematic errors, especially for upcoming surveys such as
DESI. We discuss how our model can be modified to improve the recovery of $f$,
such that the resulting constraints on $\{f,\sigma_{\rm v},r_{\rm LP}\}$ can
potentially be used as a test of cosmological models including and beyond
$\Lambda$CDM.
|
[
"astro-ph.CO"
] |
astro-ph.CO
|
Cosmology and Nongalactic Astrophysics
| 1,725Cosmology and Nongalactic Astrophysics
|
|
hep-ph/0601269
|
We discuss the spectrum of Higgs bosons in the framework of the exceptional
supersymmetric standard model. The presence of a $Z'$ and exotic particles
predicted by the exceptional SUSY model allows the lightest Higgs particle to
be significantly heavier than in the MSSM and NMSSM. When the mass of the
lightest Higgs boson is larger than $135-140 {GeV}$ the heaviest scalar,
pseudoscalar and charged Higgs states lie beyond the ${TeV}$ range.
|
[
"hep-ph"
] |
hep-ph
|
High Energy Physics - Phenomenology
| 3,129High Energy Physics - Phenomenology
|
|
1703.05158
|
A numerical method for particle-laden fluids interacting with a deformable
solid domain and mobile rigid parts is proposed and implemented in a full
engineering system. The fluid domain is modeled with a lattice Boltzmann
representation, the particles and rigid parts are modeled with a discrete
element representation, and the deformable solid domain is modeled using a
Lagrangian mesh. The main issue of this work, since separately each of these
methods is a mature tool, is to develop coupling and model-reduction approaches
in order to efficiently simulate coupled problems of this nature, as occur in
various geological and engineering applications. The lattice Boltzmann method
incorporates a large-eddy simulation technique using the Smagorinsky turbulence
model. The discrete element method incorporates spherical and polyhedral
particles for stiff contact interactions. A neo-Hookean hyperelastic model is
used for the deformable solid. We provide a detailed description of how to
couple the three solvers within a unified algorithm. The technique we propose
for rubber modeling/coupling exploits a simplification that prevents having to
solve a finite-element problem each time step. We also develop a technique to
reduce the domain size of the full system by replacing certain zones with
quasi-analytic solutions, which act as effective boundary conditions for the
lattice Boltzmann method. The major ingredients of the routine are are
separately validated. To demonstrate the coupled method in full, we simulate
slurry flows in two kinds of piston-valve geometries. The dynamics of the valve
and slurry are studied and reported over a large range of input parameters.
|
[
"cs.CE"
] |
cs.CE
|
Computational Engineering, Finance, and Science
| 1,311Computational Engineering, Finance, and Science
|
|
quant-ph/0308135
|
We present an experimental and theoretical study of a simple, passive system
consisting of a birefringent, two-dimensional photonic crystal and a polarizer
in series, and show that superluminal dispersive effects can arise even though
no incident radiation is absorbed or reflected. We demonstrate that a vector
formulation of the Kramers-Kronig dispersion relations facilitates an
understanding of these counter-intuitive effects.
|
[
"quant-ph"
] |
quant-ph
|
Quantum Physics
| 5,985Quantum Physics
|
|
0707.2119
|
We analyze properties of the 2-adic valuations of an integer sequence that
originates from an explicit evaluation of a quartic integral. We also give a
combinatorial interpretation of the valuations of this sequence. Connections
with the orbits arising from the Collatz (3x+1) problem are discussed.
|
[
"math.NT",
"math.CO"
] |
math.NT
|
math.CO
|
Number Theory;Combinatorics
| 4,960Number Theory;Combinatorics
|
hep-ph/9804417
|
Indirect CP violation is analyzed in the framework of the electroweak gauge
theory of J=0 mesons proposed in ref.[1], in which they transform like
composite fermion-antifermion operators by the chiral U(N)left x U(N)right
group and by the SU(2)left x U(1) gauge group of the Glashow-Salam-Weinberg
model. It is shown that, in this model where, in particular, mass terms can be
introduced for the mesons themselves, and unlike what happens in the standard
model for fermions: - electroweak mass eigenstates can differ from CP
eigenstates even in the case of two generations; - the existence of a complex
entry in the mixing matrix for the constituent fermions is no longer a
sufficient condition for indirect CP violation to occur at the mesonic level.
|
[
"hep-ph"
] |
hep-ph
|
High Energy Physics - Phenomenology
| 3,129High Energy Physics - Phenomenology
|
|
1801.07318
|
The central aim in this paper is to address variable selection questions in
nonlinear and nonparametric regression. Motivated by statistical genetics,
where nonlinear interactions are of particular interest, we introduce a novel
and interpretable way to summarize the relative importance of predictor
variables. Methodologically, we develop the "RelATive cEntrality" (RATE)
measure to prioritize candidate genetic variants that are not just marginally
important, but whose associations also stem from significant covarying
relationships with other variants in the data. We illustrate RATE through
Bayesian Gaussian process regression, but the methodological innovations apply
to other "black box" methods. It is known that nonlinear models often exhibit
greater predictive accuracy than linear models, particularly for phenotypes
generated by complex genetic architectures. With detailed simulations and two
real data association mapping studies, we show that applying RATE enables an
explanation for this improved performance.
|
[
"stat.ME",
"q-bio.QM",
"stat.AP",
"stat.ML"
] |
stat.ME
|
q-bio.QM
|
Methodology;Quantitative Methods;Applications;Machine Learning
| 7,267longtail
|
1701.06980
|
We explore the far-field scattering properties of anisotropic 2D materials in
ribbon array configuration. Our study reveals the plasmon-enhanced linear
birefringence in these ultrathin metasurfaces, where linearly polarized
incident light can be scattered into its orthogonal polarization or be
converted into circular polarized light. We found wide modulation in both
amplitude and phase of the scattered light via tuning the operating frequency
or material's anisotropy and develop models to explain the observed scattering
behavior.
|
[
"cond-mat.mes-hall",
"physics.optics"
] |
cond-mat.mes-hall
|
physics.optics
|
Mesoscale and Nanoscale Physics;Optics
| 4,519Mesoscale and Nanoscale Physics;Optics
|
2012.00682
|
We deal with the problem of learning the underlying disentangled latent
factors that are shared between the paired bi-modal data in cross-modal
retrieval. Our assumption is that the data in both modalities are complex,
structured, and high dimensional (e.g., image and text), for which the
conventional deep auto-encoding latent variable models such as the Variational
Autoencoder (VAE) often suffer from difficulty of accurate decoder training or
realistic synthesis. A suboptimally trained decoder can potentially harm the
model's capability of identifying the true factors. In this paper we propose a
novel idea of the implicit decoder, which completely removes the ambient data
decoding module from a latent variable model, via implicit encoder inversion
that is achieved by Jacobian regularization of the low-dimensional embedding
function. Motivated from the recent Identifiable VAE (IVAE) model, we modify it
to incorporate the query modality data as conditioning auxiliary input, which
allows us to prove that the true parameters of the model can be identified
under some regularity conditions. Tested on various datasets where the true
factors are fully/partially available, our model is shown to identify the
factors accurately, significantly outperforming conventional encoder-decoder
latent variable models. We also test our model on the Recipe1M, the large-scale
food image/recipe dataset, where the learned factors by our approach highly
coincide with the most pronounced food factors that are widely agreed on,
including savoriness, wateriness, and greenness.
|
[
"cs.LG",
"cs.CV"
] |
cs.LG
|
cs.CV
|
Machine Learning;Computer Vision and Pattern Recognition
| 4,045Machine Learning;Computer Vision and Pattern Recognition
|
1906.04410
|
A cloud quantum computer is similar to a random number generator in that its
physical mechanism is inaccessible to its users. In this respect, a cloud
quantum computer is a black box. In both devices, its users decide the device
condition from the output. A framework to achieve this exists in the field of
random number generation in the form of statistical tests for random number
generators. In the present study, we generated random numbers on a 20-qubit
cloud quantum computer and evaluated the condition and stability of its qubits
using statistical tests for random number generators. As a result, we observed
that some qubits were more biased than others. Statistical tests for random
number generators may provide a simple indicator of qubit condition and
stability, enabling users to decide for themselves which qubits inside a cloud
quantum computer to use.
|
[
"quant-ph",
"cs.CR",
"cs.DC",
"physics.data-an",
"stat.CO"
] |
quant-ph
|
cs.CR
|
Quantum Physics;Cryptography and Security;Distributed, Parallel, and Cluster Computing;Data Analysis, Statistics and Probability;Computation
| 7,267longtail
|
astro-ph/0605614
|
We study the Gunn-Peterson effect of the photo-ionized intergalactic
medium(IGM) in the redshift range 5< z <6.4 using semi-analytic simulations
based on the lognormal model. Assuming a rapidly evolved and spatially uniform
ionizing background, the simulation can produce all the observed abnormal
statistical features near redshift z ~ 6. They include: 1) rapidly increase of
absorption depths; 2) large scatter in the optical depths; 3) long-tailed
distributions of transmitted flux and 4) long dark gaps in spectra. These
abnormal features are mainly due to rare events, which correspond to the
long-tailed probability distribution of the IGM density field, and therefore,
they may not imply significantly spatial fluctuations in the UV ionizing
background at z ~ 6.
|
[
"astro-ph"
] |
astro-ph
|
Astrophysics
| 463Astrophysics
|
|
2302.14513
|
We derive in detail the orbital period loss of a compact binary system in
presence of a fifth force and radiation of ultralight particles for a general
eccentric Keplerian orbit. We obtain constraints on fifth force strength
$\alpha\lesssim 1.11\times 10^{-3}$ from the orbital period decay of compact
binary systems. We derive constraints on the gauge coupling of ultralight
scalar $(g_S\lesssim 3.06\times 10^{-20})$ and vector $(g_V\lesssim 2.29\times
10^{-20})$ particles from orbital period loss and the constraints get stronger
in presence of a fifth force $(\alpha=0.9)$. In addition, we also obtain
constraints on the axion decay constant $(7.94\times 10^{10}~\rm{GeV}\lesssim
f_a\lesssim 3.16\times 10^{17}~\rm{GeV}, \alpha=0.9)$ if the orbital period
decays due to the combined effects of axionic fifth force and axion radiation.
We also achieve constraints on the strengths of the fifth force
$(\alpha\lesssim 0.025)$ and radiation $(\beta\lesssim 10^{-3})$ from GW170817.
The constraints on new force parameters depend on the choice of the initial
eccentricity which we include in our analysis $(\epsilon_0=10^{-6}, 0.1)$. We
do the model independent estimate of the capture of dark matter mass fraction
by a binary system. Lastly, we obtain constraints on fifth force strength due
to Brans-Dicke mediated scalar between two compact stars in a binary system
$(\omega_{\rm{BD}}>266)$ and from the Nordtvedt effect
$(\omega_{\rm{BD}}>75858)$. The bound on Brans-Dicke coupling gets stronger if
one includes the effect of eccentricity. Our constraints can be generalized to
any alternative theories of gravity and will be within the reach of second and
third generation gravitational wave detectors.
|
[
"hep-ph",
"astro-ph.CO",
"gr-qc"
] |
hep-ph
|
astro-ph.CO
|
High Energy Physics - Phenomenology;Cosmology and Nongalactic Astrophysics;General Relativity and Quantum Cosmology
| 3,160High Energy Physics - Phenomenology;Cosmology and Nongalactic Astrophysics;General Relativity and Quantum Cosmology
|
physics/9904016
|
Avogadro's number is a count of a definite number of things and, therefore,
must be an integer and not a floating point number. Arguments are given herein
that this integer should be precisely 2E79 - that is,
N_o = 2E79 = 6.04 462 909 107 318 607 353 088 E23;
hence, the binary mole.
|
[
"physics.gen-ph"
] |
physics.gen-ph
|
General Physics
| 2,645General Physics
|
|
cond-mat/0310606
|
We present the first principles results of point defect energetics in silicon
calculated using the LDA+U method: a Hubbard type on-site interaction added to
the local density approximation (LDA). The on-site Coulomb and exchange
parameters were tuned to match the experimental band gap in Si. The relaxed
configuration was obtained using the LDA; LDA+U was used only to calculate the
energies. Our values of point defect energetics are in very good agreement with
both recent experimental results and quantum Monte Carlo (QMC) calculations.
|
[
"cond-mat.mtrl-sci",
"cond-mat.str-el"
] |
cond-mat.mtrl-sci
|
cond-mat.str-el
|
Materials Science;Strongly Correlated Electrons
| 4,377Materials Science;Strongly Correlated Electrons
|
2008.01996
|
We consider a space-time variational formulation of parabolic
initial-boundary value problems in anisotropic Sobolev spaces in combination
with a Hilbert-type transformation. This variational setting is the starting
point for the space-time Galerkin finite element discretization that leads to a
large global linear system of algebraic equations. We propose and investigate
new efficient direct solvers for this system. In particular, we use a
tensor-product approach with piecewise polynomial, globally continuous ansatz
and test functions. The developed solvers are based on the Bartels-Stewart
method and on the Fast Diagonalization method, which result in solving a
sequence of spatial subproblems. The solver based on the Fast Diagonalization
method allows to solve these spatial subproblems in parallel leading to a full
parallelization in time. We analyze the complexity of the proposed algorithms,
and give numerical examples for a two-dimensional spatial domain, where sparse
direct solvers for the spatial subproblems are used.
|
[
"math.NA",
"cs.NA"
] |
math.NA
|
cs.NA
|
Numerical Analysis;Numerical Analysis
| 5,059Numerical Analysis;Numerical Analysis
|
1909.01203
|
We present an approach to recover absolute 3D human poses from multi-view
images by incorporating multi-view geometric priors in our model. It consists
of two separate steps: (1) estimating the 2D poses in multi-view images and (2)
recovering the 3D poses from the multi-view 2D poses. First, we introduce a
cross-view fusion scheme into CNN to jointly estimate 2D poses for multiple
views. Consequently, the 2D pose estimation for each view already benefits from
other views. Second, we present a recursive Pictorial Structure Model to
recover the 3D pose from the multi-view 2D poses. It gradually improves the
accuracy of 3D pose with affordable computational cost. We test our method on
two public datasets H36M and Total Capture. The Mean Per Joint Position Errors
on the two datasets are 26mm and 29mm, which outperforms the state-of-the-arts
remarkably (26mm vs 52mm, 29mm vs 35mm). Our code is released at
\url{https://github.com/microsoft/multiview-human-pose-estimation-pytorch}.
|
[
"cs.CV"
] |
cs.CV
|
Computer Vision and Pattern Recognition
| 1,498Computer Vision and Pattern Recognition
|
|
1810.10339
|
The human brain cortical layer has a convoluted morphology that is unique to
each individual. Characterization of the cortical morphology is necessary in
longitudinal studies of structural brain change, as well as in discriminating
individuals in health and disease. A method for encoding the cortical
morphology in the form of a graph is presented. The design of graphs that
encode the global cerebral hemisphere cortices as well as localized cortical
regions is proposed. Spectral features of these graphs are then studied and
proposed as descriptors of cortical morphology. As proof-of-concept of their
applicability in characterizing cortical morphology, the descriptors are
studied in the context of discriminating individuals based on their sex.
|
[
"cs.CV",
"q-bio.NC"
] |
cs.CV
|
q-bio.NC
|
Computer Vision and Pattern Recognition;Neurons and Cognition
| 1,629Computer Vision and Pattern Recognition;Neurons and Cognition
|
2007.15852
|
The binary fraction of unevolved massive stars is thought to be 70-100% but
there are few observational constraints on the binary fraction of the evolved
version of a subset of these stars, the red supergiants (RSGs). Here we
identify a complete sample of RSGs in the Large Magellanic Cloud (LMC) using
new spectroscopic observations and archival UV, IR and broadband optical
photometry. We find 4090 RSGs with log L/Lo > 3.5 with 1820 of them having log
L/Lo > 4, which we believe is our completeness limit. We additionally
spectroscopically confirmed 38 new RSG+B star binaries in the LMC, bringing the
total known up to 55. We then estimated the binary fraction using a k-nearest
neighbors algorithm that classifies stars as single or binary based on
photometry with a spectroscopic sample as a training set. We take into account
observational biases such as line-of-sight stars and binaries in eclipse while
also calculating model-dependent corrections for RSGs with companions that our
observations were not designed to detect. Based on our data, we find an initial
result of 13.5 +7.56/-6.67% for RSGs with O or B-type companions. Using the
Binary Population and Spectral Synthesis (BPASS) models to correct for
unobserved systems, this corresponds to a total RSG binary fraction of 19.5
+7.6/-6.7%. This number is in broad agreement with what we would expect given
an initial OB binary distribution of 70%, a predicted merger fraction of 20-30%
and a binary interaction fraction of 40-50%.
|
[
"astro-ph.SR",
"astro-ph.GA"
] |
astro-ph.SR
|
astro-ph.GA
|
Solar and Stellar Astrophysics;Astrophysics of Galaxies
| 6,669Solar and Stellar Astrophysics;Astrophysics of Galaxies
|
math/0607729
|
The aim of this paper is to study the multipliers from $A_{r}(I)$ to
$A_{p}(I), r \ne p$, where $I=(0,\infty)$ is the locally compact topological
semigroup with multiplication max and usual topology and $A_{r}(I) = \{f \in
L_{1}(I)\hbox{:} \hat{f} \in L_{r}(\hat{I})\}$ with norm $|||f|||_{r} =
\|f\|_{1} + \|\hat{f}\|_{r}$.
|
[
"math.FA"
] |
math.FA
|
Functional Analysis
| 2,549Functional Analysis
|
|
2401.01766
|
A subgraph of an edge-colored graph is rainbow if all of its edges have
different colors. Let $G$ and $H$ be two graphs. The anti-Ramsey number $\ar(G,
H)$ is the maximum number of colors of an edge-coloring of $G$ that does not
contain a rainbow copy of $H$. In this paper, we study the anti-Ramsey numbers
of $K_k$ in complete multi-partite graphs. We determine the values of the
anti-Ramsey numbers of $K_k$ in complete $k$-partite graphs and in balanced
complete $r$-partite graphs for $r\geq k$.
|
[
"math.CO"
] |
math.CO
|
Combinatorics
| 1,014Combinatorics
|
|
1407.4728
|
The nonmesonic weak decay spectra of light hypernuclei have been evaluated in
a systematic way. As theoretical framework we adopt the independent particle
shell model with three different one-meson-exchange transition potentials. Good
agreement with data is obtained for proton and neutron kinetic energy spectra
of $^4_\Lambda$He, and $^5_\Lambda$He, when the recoil effect is considered.
The coincidence spectra of proton-neutron pairs are also accounted for quite
reasonably, but it was not possible to reproduce the data for the
neutron-neutron pair spectra. It is suggested that the $\pi+K$ meson-exchange
model with soft monopole form factors could be a good starting point for
describing the dynamics responsible for the decays of these two hypernuclei.
The $^4_\Lambda$H~ spectra are also presented.
|
[
"nucl-th"
] |
nucl-th
|
Nuclear Theory
| 4,876Nuclear Theory
|
|
1406.7094
|
We introduce an experimentally accessible method to measure a unique degree
of nonclassicality, based on the quantum superposition principle, for arbitrary
quantum states. We formulate witnesses and test a given state for any
particular value of this measure. The construction of optimal tests is
presented as well as the general numerical implementation. We apply this
approach on examples such as squeezed states, and we show how to formulate
conditions to certify a particular degree of nonclassicality for single- and
multimode radiation fields.
|
[
"quant-ph"
] |
quant-ph
|
Quantum Physics
| 5,985Quantum Physics
|
|
1010.3936
|
We first define a quantity exhibiting the usefulness of bipartite quantum
states for teleportation, called the quantum teleportation capability, and then
investigate its restricted shareability in multi-party quantum systems. In this
work, we verify that the quantum teleportation capability has a monogamous
property in its shareability for arbitrary three-qutrit pure states by
employing the monogamy inequality in terms of the negativity.
|
[
"quant-ph"
] |
quant-ph
|
Quantum Physics
| 5,985Quantum Physics
|
|
1909.03808
|
With the rapid development of Internet finance, a large number of studies
have shown that Internet financial platforms have different financial systemic
risk characteristics when they are subject to macroeconomic shocks or fragile
internal crisis. From the perspective of regional development of Internet
finance, this paper uses t-SNE machine learning algorithm to obtain data mining
of China's Internet finance development index involving 31 provinces and 335
cities and regions. The conclusion of the peak and thick tail characteristics,
then proposed three classification risks of Internet financial systemic risk,
providing more regionally targeted recommendations for the systematic risk of
Internet finance.
|
[
"q-fin.ST",
"econ.EM"
] |
q-fin.ST
|
econ.EM
|
Statistical Finance;Econometrics
| 6,809Statistical Finance;Econometrics
|
hep-ex/0012060
|
This paper presents the latest results from experiment E787, at Brookhaven
National Laboratory, on K+ -> pi nu/nubar and radiative K+ decays. The result
for K+ -> pi nu/nubar uses data collected in runs taken during 1995, 1996 and
1997. In addition, we discuss plans for future measurements of K+ -> pi
nu/nubar.
|
[
"hep-ex"
] |
hep-ex
|
High Energy Physics - Experiment
| 3,059High Energy Physics - Experiment
|
|
2111.03421
|
In this technical report, we present our solution to the Traffic4Cast 2021
Core Challenge, in which participants were asked to develop algorithms for
predicting a traffic state 60 minutes ahead, based on the information from the
previous hour, in 4 different cities. In contrast to the previously held
competitions, this year's challenge focuses on the temporal domain shift in
traffic due to the COVID-19 pandemic. Following the past success of U-Net, we
utilize it for predicting future traffic maps. Additionally, we explore the
usage of pre-trained encoders such as DenseNet and EfficientNet and employ
multiple domain adaptation techniques to fight the domain shift. Our solution
has ranked third in the final competition. The code is available at
https://github.com/jbr-ai-labs/traffic4cast-2021.
|
[
"cs.CV",
"cs.AI",
"cs.LG"
] |
cs.CV
|
cs.AI
|
Computer Vision and Pattern Recognition;Artificial Intelligence;Machine Learning
| 1,521Computer Vision and Pattern Recognition;Artificial Intelligence;Machine Learning
|
0812.1086
|
Thalamic relay cells fire action potentials that transmit information from
retina to cortex. The amount of information that spike trains encode is usually
estimated from the precision of spike timing with respect to the stimulus.
Sensory input, however, is only one factor that influences neural activity. For
example, intrinsic dynamics, such as oscillations of networks of neurons, also
modulate firing pattern. Here, we asked if retinal oscillations might help to
convey information to neurons downstream. Specifically, we made whole-cell
recordings from relay cells to reveal retinal inputs (EPSPs) and thalamic
outputs (spikes) and analyzed these events with information theory. Our results
show that thalamic spike trains operate as two multiplexed channels. One
channel, which occupies a low frequency band (<30 Hz), is encoded by average
firing rate with respect to the stimulus and carries information about local
changes in the image over time. The other operates in the gamma frequency band
(40-80 Hz) and is encoded by spike time relative to the retinal oscillations.
Because these oscillations involve extensive areas of the retina, it is likely
that the second channel transmits information about global features of the
visual scene. At times, the second channel conveyed even more information than
the first.
|
[
"q-bio.NC"
] |
q-bio.NC
|
Neurons and Cognition
| 4,806Neurons and Cognition
|
|
1404.3868
|
We describe two noncollinear optical parametric amplifier (NOPA) systems
pumped by either the second (515 nm) or the third (343 nm) harmonic of an
Yb:KGW amplifier, respectively. Pulse durations as short as 6.8 fs are readily
obtained by compression with commercially available chirped mirrors. The
availability of both second and third harmonic for NOPA pumping allows for
gap-free tuning from 520 to 980 nm. The use of an intermediate NOPA to generate
seed light at 780 nm extends the tuning range of the third-harmonic pumped NOPA
towards 450 nm.
|
[
"physics.optics"
] |
physics.optics
|
Optics
| 5,146Optics
|
|
1411.2224
|
We calculate the coefficients of the dimension-8 quark and gluon condensates
in the current-current correlator of $1^{-+}$ light hybrid current
$g\bar{q}(x)\gamma_{\nu}iG_{\mu\nu}(x)q{(x)}$. With inclusion of these
higher-power corrections and updating the input parameters, we re-analyze the
mass of the $1^{-+}$ light hybrid meson from Monte-Carlo based QCD sum rules.
Considering the possible violation of factorization of higher dimensional
condensates and variation of $\langle g^3G^3\rangle$, we obtain a conservative
mass range 1.72--2.60\,GeV, which favors $\pi_{1}(2015)$ as a better hybrid
candidate compared with $\pi_{1}(1600)$ and $\pi_{1}(1400)$.
|
[
"hep-ph"
] |
hep-ph
|
High Energy Physics - Phenomenology
| 3,129High Energy Physics - Phenomenology
|
|
1109.4151
|
NGC 6823 is a young open cluster that lies at a distance of ~2 kpc in the
Vulpecula OB1 association. Previous studies using CCD photometry and
spectroscopy have identified a Trapezium system of bright O- and B-type stars
at its center. We present optical, near-infrared and Spitzer photometric
observations of the cluster. Our survey reaches down to I~22 mag and Ks~18 mag.
There is significant differential reddening within the cluster. We find a
bimodal distribution for Av, with a peak at ~3 mag and a broader peak at ~10
mag. We find a ~20% fraction of Class I/Class II young stellar objects (YSOs)
in the cluster, while a large 80% fraction of the sources have a Class III
classification. We have made use of the IPHAS survey in order to probe the
strength in Halpha emission for this large population of Class III sources.
Nearly all of the Class III objects have photospheric (r'-Halpha) colors,
implying an absence of Halpha in emission. This large population of Class III
sources is thus likely the extincted field star population rather than the
diskless YSOs in the cluster. There is a higher concentration of the Class I/II
systems in the eastern region of the cluster and close to the central
Trapezium. The western part of the cluster mostly contains Class III/field
stars and seems devoid of disk sources. We find evidence of a pre-main sequence
population in NGC 6823, in addition to an upper main-sequence population. The
pre-main sequence population mainly consists of young disk sources with ages
between ~1-5 Myr, and at lower masses of ~0.1-0.4 Msun. There may be a possible
mass dependent age spread in the cluster, with the older stars being more
massive than the younger ones. The presence of young disk sources in NGC 6823
indicates similar star formation properties in the outer regions of the Galaxy
as observed for young clusters in the solar neighborhood.
|
[
"astro-ph.SR"
] |
astro-ph.SR
|
Solar and Stellar Astrophysics
| 6,668Solar and Stellar Astrophysics
|
|
cond-mat/0009273
|
We give an alternative method to that of Hardy-Ramanujan-Rademacher to derive
the leading exponential term in the asymptotic approximation to the partition
function p(n,a), defined as the number of decompositions of a positive integer
'n' into integer summands, with each summand appearing at most 'a' times in a
given decomposition. The derivation involves mapping to an equivalent physical
problem concerning the quantum entropy and energy currents of particles flowing
in a one-dimensional channel connecting thermal reservoirs, and which obey
Gentile's intermediate statistics with statistical parameter 'a'. The method is
also applied to partitions associated with Haldane's fractional exclusion
statistics.
|
[
"cond-mat.stat-mech",
"cond-mat.mes-hall",
"math.NT",
"quant-ph"
] |
cond-mat.stat-mech
|
cond-mat.mes-hall
|
Statistical Mechanics;Mesoscale and Nanoscale Physics;Number Theory;Quantum Physics
| 7,267longtail
|
1506.06264
|
In this paper we investigate the one-dimensional harmonic oscillator with a
singular perturbation concentrated in one point. We describe all possible
selfadjoint realizations and we show that for certain conditions on the
perturbation exactly one negative eigenvalues can arise. This eigenvalue tends
to $-\infty$ as the perturbation becomes stronger.
|
[
"math.FA"
] |
math.FA
|
Functional Analysis
| 2,549Functional Analysis
|
|
2310.11494
|
We revisit the study of string theory close to the Hagedorn temperature with
the aim towards cosmological applications. We consider interactions of open and
closed strings in a gas of D$p-$branes, and/or one isolated D$p$-brane, in an
arbitrary number $d$ of flat non-compact dimensions and general compact
dimensions. Leading order string perturbation theory is used to obtain the
basic interaction rates in a flat background, which are shown to be consistent
with the random walk picture of highly excited strings that should apply in
more general backgrounds. Using the random walk interpretation we infer the
structure of more general semi-inclusive string scattering rates and then write
down the corresponding Boltzmann equations describing ensembles of highly
excited closed and open strings. We organise the interaction terms in Boltzmann
equations so that detailed balance becomes manifest. We obtain the equilibrium
solutions and show that they reduce to previously computed solutions for $d=0$.
We further study the behaviour of non-equlibrium fluctuations and find explicit
analytic expressions for the equilibration rates (and for the number of open
strings in $d=0$). Potential implications for an early universe with strings at
high temperatures are outlined.
|
[
"hep-th"
] |
hep-th
|
High Energy Physics - Theory
| 3,266High Energy Physics - Theory
|
|
0706.0438
|
A holonomic constraint is used to enforce a constant instantaneous
configurational temperature on an equilibrium system. Three sets of equations
of motion are obtained, differing according to the way in which the holonomic
constraint is introduced and the phase space distribution function that is
preserved by the dynamics. Firstly, Gauss' principle of least constraint is
used, and it is shown that it does not preserve the canonical distribution.
Secondly, a modified Hamiltonian is used to find a dynamics that provides a
restricted microcanonical distribution. Lastly, we provide equations that are
specifically designed to both satisfy the temperature constraint and produce a
restricted canonical ensemble.
|
[
"cond-mat.stat-mech"
] |
cond-mat.stat-mech
|
Statistical Mechanics
| 6,821Statistical Mechanics
|
|
1607.03649
|
Logics and model-checking have been successfully used in the last decades for
modeling and verification of various types of hardware (and software) systems.
While most languages and techniques emerged in a context of monolithic systems
with a limited self-adaptability, modern systems require approaches able to
cope with dynamically changing requirements and emergent behaviors. The
emphasis on system reconfigurability has not been followed by an adequate
research effort, and the current state of the art lacks logics and model
checking paradigms that can describe and analyze complex modern systems in a
comprehensive way. This paper describes a case study involving the dynamic
reconfiguration of an office workflow. We state the requirements on a system
implementing the workflow and its reconfiguration and we prove workflow
reconfiguration termination by providing a compilation of generic workflows
into LTL, using the Bound model checker Zot. The objective of this paper is
demonstrating how temporal logics and model checking are effective in proving
properties of dynamic, reconfigurable and adaptable systems. This simple case
study is just a "proof of concept" to demonstrate the feasibility of our ideas.
|
[
"cs.SE"
] |
cs.SE
|
Software Engineering
| 6,626Software Engineering
|
|
hep-ph/9810525
|
In a strongly-interacting electroweak sector with an isosinglet vector state,
such as the techni-omega, $\omega_T$, the direct $ \omega_T Z \gamma $ coupling
implies that an $\omega_T$ can be produced by $Z \gamma$ fusion in $e \gamma$
collisions. This is a unique feature for high energy $e^+e^-$ or $e^-e^-$
colliders operating in an $e\gamma$ mode. We consider the processes $e^- \gamma
\to e^- Z\gamma$ and $e^- \gamma \to e^- W^+ W^- Z$, both of which proceed via
an intermediate $\omega_T$. We find that at a 1.5 TeV $e^+e^-$ linear collider
operating in an $e\gamma$ mode with an integrated luminosity of 200 fb$^{-1}$,
we can discover an $\omega_T$ for a broad range of masses and widths.
|
[
"hep-ph"
] |
hep-ph
|
High Energy Physics - Phenomenology
| 3,129High Energy Physics - Phenomenology
|
|
1909.06475
|
A Mendelsohn triple system of order $v$ (or MTS$(v)$) is a decomposition of
the complete graph into directed 3-cyles. We denote the directed 3-cycle with
edges $(x,y)$, $(y,z)$ and $(z,x)$ by $(x,y,z)$, $(y,z,x)$ or $(z,x,y)$. An
$\ell$-good sequencing of a MTS$(v)$ is a permutation of the points of the
design, say $[x_1 \; \cdots \; x_v]$, such that, for every triple $(x,y,z)$ in
the design, it is not the case that $x = x_i$, $y = x_j$ and $z = x_k$ with $i
< j < k$ and $k-i+1 \leq \ell$; or with $j < k < i$ and $i-j+1 \leq \ell$; or
with $k < i < j$ and $j-k+1 \leq \ell$.
|
[
"math.CO"
] |
math.CO
|
Combinatorics
| 1,014Combinatorics
|
|
0907.3791
|
We propose a new iterative unfolding method for experimental data, making use
of a regularization function. The use of this function allows one to build an
improved normalization procedure for Monte Carlo spectra, unbiased by the
presence of possible new structures in data. We are able to unfold, in a
dynamically stable way, data spectra which can be strongly affected by
fluctuations in the background subtraction and simultaneously reconstruct
structures which were not initially simulated. This method also allows one to
control the amount of correlations introduced between the bins of the unfolded
spectrum, when the transfers of events correcting the systematic detector
effects are performed.
|
[
"physics.data-an",
"hep-ex"
] |
physics.data-an
|
hep-ex
|
Data Analysis, Statistics and Probability;High Energy Physics - Experiment
| 1,884Data Analysis, Statistics and Probability;High Energy Physics - Experiment
|
1703.06043
|
Despite being originally inspired by the central nervous system, artificial
neural networks have diverged from their biological archetypes as they have
been remodeled to fit particular tasks. In this paper, we review several
possibilites to reverse map these architectures to biologically more realistic
spiking networks with the aim of emulating them on fast, low-power neuromorphic
hardware. Since many of these devices employ analog components, which cannot be
perfectly controlled, finding ways to compensate for the resulting effects
represents a key challenge. Here, we discuss three different strategies to
address this problem: the addition of auxiliary network components for
stabilizing activity, the utilization of inherently robust architectures and a
training method for hardware-emulated networks that functions without perfect
knowledge of the system's dynamics and parameters. For all three scenarios, we
corroborate our theoretical considerations with experimental results on
accelerated analog neuromorphic platforms.
|
[
"q-bio.NC",
"cs.NE",
"stat.ML"
] |
q-bio.NC
|
cs.NE
|
Neurons and Cognition;Neural and Evolutionary Computing;Machine Learning
| 4,840Neurons and Cognition;Neural and Evolutionary Computing;Machine Learning
|
1801.06820
|
A scalar model of wet active matter in the presence of an imposed temperature
gradient, or chemical potential gradient, is considered. It is shown that there
is a convective instability driven by a (negative) activity parameter. In this
non-equilibrium steady state the generic long-ranged correlations are computed
and compared and contrasted with the analogous results in a passive fluid. In
addition, the non-equilibrium Casimir pressure or force is computed.
Singularities in various physical quantities as the instability is approached
are determined. Finally, we give the generalized Lorenz equations
characterizing the fluid behavior above the instability and contrast these
equations to the Lorenz equations for the Rayleigh-Bernard instability in a
passive fluid.
|
[
"cond-mat.soft"
] |
cond-mat.soft
|
Soft Condensed Matter
| 6,537Soft Condensed Matter
|
|
1909.13733
|
Cross-modal embeddings, between textual and visual modalities, aim to
organise multimodal instances by their semantic correlations. State-of-the-art
approaches use maximum-margin methods, based on the hinge-loss, to enforce a
constant margin m, to separate projections of multimodal instances from
different categories. In this paper, we propose a novel scheduled adaptive
maximum-margin (SAM) formulation that infers triplet-specific constraints
during training, therefore organising instances by adaptively enforcing
inter-category and inter-modality correlations. This is supported by a
scheduled adaptive margin function, that is smoothly activated, replacing a
static margin by an adaptively inferred one reflecting triplet-specific
semantic correlations while accounting for the incremental learning behaviour
of neural networks to enforce category cluster formation and enforcement.
Experiments on widely used datasets show that our model improved upon
state-of-the-art approaches, by achieving a relative improvement of up to
~12.5% over the second best method, thus confirming the effectiveness of our
scheduled adaptive margin formulation.
|
[
"cs.MM",
"cs.LG"
] |
cs.MM
|
cs.LG
|
Multimedia;Machine Learning
| 4,707Multimedia;Machine Learning
|
2101.08936
|
Backward Stochastic Differential Equations (BSDEs) have been widely employed
in various areas of social and natural sciences, such as the pricing and
hedging of financial derivatives, stochastic optimal control problems, optimal
stopping problems and gene expression. Most BSDEs cannot be solved analytically
and thus numerical methods must be applied to approximate their solutions.
There have been a variety of numerical methods proposed over the past few
decades as well as many more currently being developed. For the most part, they
exist in a complex and scattered manner with each requiring a variety of
assumptions and conditions. The aim of the present work is thus to
systematically survey various numerical methods for BSDEs, and in particular,
compare and categorize them, for further developments and improvements. To
achieve this goal, we focus primarily on the core features of each method based
on an extensive collection of 333 references: the main assumptions, the
numerical algorithm itself, key convergence properties and advantages and
disadvantages, to provide an up-to-date coverage of numerical methods for
BSDEs, with insightful summaries of each and a useful comparison and
categorization.
|
[
"math.NA",
"cs.NA",
"math.PR"
] |
math.NA
|
cs.NA
|
Numerical Analysis;Numerical Analysis;Probability
| 5,086Numerical Analysis;Numerical Analysis;Probability
|
1808.10109
|
We revisit the spectrum of closed strings in the Lorentzian signature 2D
black hole in string theory. Using the description of the black hole as a
gauged WZNW model, we argue that the spectrum of the closed strings contain
states from the spectrally flowed versions of the principal continuous and also
the principal discrete series of $SL_2({\mathbb R})$. We identify the string
configurations that correspond to these states. Using vector-axial duality, we
also find new localized states that are essentially stringy in origin.
|
[
"hep-th"
] |
hep-th
|
High Energy Physics - Theory
| 3,266High Energy Physics - Theory
|
|
1502.04491
|
Context. In previous work, we developed a quasi-Gaussian approximation for
the likelihood of correlation functions, which, in contrast to the usual
Gaussian approach, incorporates fundamental mathematical constraints on
correlation functions. The analytical computation of these constraints is only
feasible in the case of correlation functions of one-dimensional random fields.
Aims. In this work, we aim to obtain corresponding constraints in the case of
higher-dimensional random fields and test them in a more realistic context.
Methods. We develop numerical methods to compute the constraints on
correlation functions which are also applicable for two- and three-dimensional
fields. In order to test the accuracy of the numerically obtained constraints,
we compare them to the analytical results for the one-dimensional case.
Finally, we compute correlation functions from the halo catalog of the
Millennium Simulation, check whether they obey the constraints, and examine the
performance of the transformation used in the construction of the
quasi-Gaussian likelihood.
Results. We find that our numerical methods of computing the constraints are
robust and that the correlation functions measured from the Millennium
Simulation obey them. Despite the fact that the measured correlation functions
lie well inside the allowed region of parameter space, i.e. far away from the
boundaries of the allowed volume defined by the constraints, we find strong
indications that the quasi-Gaussian likelihood yields a substantially more
accurate description than the Gaussian one.
|
[
"astro-ph.CO",
"stat.AP"
] |
astro-ph.CO
|
stat.AP
|
Cosmology and Nongalactic Astrophysics;Applications
| 1,726Cosmology and Nongalactic Astrophysics;Applications
|
2305.10943
|
In this paper, a new class of string and holographic dark energy (HDE)
cosmological model in the context of f(R) theory of gravity using the Kasner
metric is considered. The exact solution of filed equations are obtained by
using the relation between average scale factor and the scalar function f(R).
It is observed that the universe is accelerating and expanding. The string
phase of the universe is present at early stage of evolution of the universe.
The universe is dominated by quintessence type HDE at present. Effect of the
curvature function f(R) is also observed on dynamical parameters.
|
[
"gr-qc"
] |
gr-qc
|
General Relativity and Quantum Cosmology
| 2,674General Relativity and Quantum Cosmology
|
|
1405.6814
|
We present a series of radiative MHD simulations addressing the origin and
distribution of mixed polarity magnetic field in the solar photosphere. To this
end we consider numerical simulations that cover the uppermost 2-6 Mm of the
solar convection zone and we explore scales ranging from 2 km to 25 Mm. We
study how the strength and distribution of magnetic field in the photosphere
and subsurface layers depend on resolution, domain size and boundary
conditions. We find that 50% of the magnetic energy at the \tau=1 level comes
from field with the less than 500 G strength and that 50% of the energy resides
on scales smaller than about 100 km. While probability distribution functions
are essentially independent of resolution, properly describing the spectral
energy distribution requires grid spacings of 8 km or smaller. The formation of
flux concentrations in the photosphere exceeding 1 kG requires a mean vertical
field strength greater than 30-40 G at \tau=1. The filling factor of kG flux
concentrations increases with overall domain size as magnetic field becomes
organized by larger, longer lived flow structures. A solution with a mean
vertical field strength of around 85 G at \tau=1 requires a subsurface RMS
field strength increasing with depth at the same rate as the equipartition
field strength. We consider this an upper limit for the quiet Sun field
strength, which implies that most of the convection zone is magnetized close to
equipartition. We discuss these findings in view of recent high-resolution
spectropolarimetric observations of quiet Sun magnetism.
|
[
"astro-ph.SR"
] |
astro-ph.SR
|
Solar and Stellar Astrophysics
| 6,668Solar and Stellar Astrophysics
|
|
2303.03406
|
If a light axion is present during inflation and becomes part of dark matter
afterwards, its quantum fluctuations contribute to dark matter isocurvature. In
this article, we introduce a whole new suite of cosmological observables for
axion isocurvature, which could help test the presence of axions, as well as
its coupling to the inflaton and other heavy spectator fields during inflation
such as the radial mode of the Peccei-Quinn field. They include correlated
clock signals in the curvature and isocurvature spectra, and mixed
cosmological-collider non-Gaussianities involving both curvature and
isocurvature fluctuations with shapes and running unconstrained by the current
data. Taking into account of the existing strong constraints on axion
isocurvature fluctuations from the CMB, these novel signals could still be
sizable and potentially observable. In some models, the signals, if observed,
could even help us significantly narrow down the range of the inflationary
Hubble scale, a crucial parameter difficult to be determined in general,
independent of the tensor mode.
|
[
"hep-ph",
"astro-ph.CO",
"hep-th"
] |
hep-ph
|
astro-ph.CO
|
High Energy Physics - Phenomenology;Cosmology and Nongalactic Astrophysics;High Energy Physics - Theory
| 3,176High Energy Physics - Phenomenology;Cosmology and Nongalactic Astrophysics;High Energy Physics - Theory
|
2212.07140
|
Two recent publications describe realizable Gauss diagrams using conditions
stating that the number of chords in certain sets of chords is even or odd. We
demonstrate that these descriptions are incorrect by finding multiple
counter-examples. However, the idea of having a parity-based description of
realizable Gauss diagrams is attractive. We recall that realizability of Gauss
diagrams as touch curves can be described via bipartite graphs. We show that
realizable Gauss diagrams can be described via bipartite graphs.
|
[
"math.GT"
] |
math.GT
|
Geometric Topology
| 2,813Geometric Topology
|
|
0912.4349
|
We investigate the connection between the shot-noise limit in linear
interferometers and particle entanglement. In particular, we ask whether or not
sub shot-noise sensitivity can be reached with all pure entangled input states
of $N$ particles if they can be optimized with local operations. Results on the
optimal local transformations allow us to show that for $N=2$ all pure
entangled states can be made useful for sub shot-noise interferometry while for
$N>2$ this is not the case. We completely classify the useful entangled states
available in a bosonic two-mode interferometer. We apply our results to several
states, in particular to multi-particle singlet states and to cluster states.
The latter turn out to be practically useless for sub shot-noise
interferometry. Our results are based on the Cramer-Rao bound and the Fisher
information.
|
[
"quant-ph",
"cond-mat.quant-gas"
] |
quant-ph
|
cond-mat.quant-gas
|
Quantum Physics;Quantum Gases
| 6,169Quantum Physics;Quantum Gases
|
1206.0502
|
We present a 1.16-\mum-radius disk cavity with ultrahigh quality (Q) factor
by embedding the disk into a sunflower-type circular photonic crystal (CPC).
The band gap of the CPC reduces the bending loss of the whispering-gallery mode
of the disk, leading to a simulated Q of 10^7, at least one order of magnitude
higher than a bare disk of the same size. The design is experimentally verified
with a record high loaded Q of 7.4 \times 10^5 measured from an optimized
device fabricated on a silicon-on-insulator substrate.
|
[
"physics.optics"
] |
physics.optics
|
Optics
| 5,146Optics
|
|
hep-ph/9808260
|
It is shown that thermal inflation arises naturally in rank greater than five
unified theories when non-renormalisable terms are introduced. Thermal
inflation is driven by two Higgs fields \Phi_{B-L} and \bar{\Phi}_{B-L} which
also break U(1)_{B-L} when acquiring vevs at the end of inflation. The
inflationary period provides enough e-foldings to solve the monopole problem
for M_{B-L} \geq 10^{12} GeV. We point out that observations suggest that
M_{B-L} \simeq 10^{14} GeV.
|
[
"hep-ph"
] |
hep-ph
|
High Energy Physics - Phenomenology
| 3,129High Energy Physics - Phenomenology
|
|
1311.6483
|
The first fully non-linear numerical simulations of colliding charged black
holes in D=4 Einstein-Maxwell theory were recently reported arXiv:1205.1063.
These collisions were performed for black holes with equal charge-to-mass
ratio, for which initial data can be found in closed analytic form. Here we
generalize the study of collisions of charged black holes to the case of
unequal charge-to-mass ratios. We focus on oppositely charged black holes, as
to maximize acceleration-dependent effects. As |Q|/M increases from 0 to 0.99,
we observe that the gravitational radiation emitted increases by a factor of ~
2.7; the electromagnetic radiation emission becomes dominant for |Q|/M >~ 0.37
and at |Q|/M=0.99 is larger, by a factor of ~ 5.8, than its gravitational
counterpart. We observe that these numerical results exhibit a precise and
simple scaling with the charge. Furthermore, we show that the results from the
numerical simulations are qualitatively captured by a simple analytic model
that computes the electromagnetic dipolar radiation and the gravitational
quadrupolar radiation of two non-relativistic interacting particles in
Minkowski spacetime.
|
[
"gr-qc",
"hep-th"
] |
gr-qc
|
hep-th
|
General Relativity and Quantum Cosmology;High Energy Physics - Theory
| 2,746General Relativity and Quantum Cosmology;High Energy Physics - Theory
|
2206.11486
|
Determining black hole masses and accretion rates with better accuracy and
precision is crucial for understanding quasars as a population. These are
fundamental physical properties that underpin models of active galactic nuclei.
A primary technique to measure the black hole mass employs the reverberation
mapping of low-redshift quasars, which is then extended via the
radius-luminosity relationship for the broad-line region to estimate masses
based on single-epoch spectra. An updated radius-luminosity relationship
incorporates the flux ratio of optical Fe ii to H$\beta$ ($\equiv
\mathcal{R}_{\rm Fe}$) to correct for a bias in which more highly accreting
systems have smaller line-emitting regions than previously realized. In this
current work, we demonstrate and quantify the effect of using this Fe-corrected
radius-luminosity relationship on mass estimation by employing archival data
sets possessing rest-frame optical spectra over a wide range of redshifts. We
find that failure to use a Fe-corrected radius predictor results in
overestimated single-epoch black hole masses for the most highly accreting
quasars. Their accretion rate measures ($L_{\rm Bol}/ L_{\rm Edd}$ and
$\dot{\mathscr{M}}$), are similarly underestimated. The strongest Fe-emitting
quasars belong to two classes: high-z quasars with rest-frame optical spectra,
which given their extremely high luminosities, require high accretion rates,
and their low-z analogs, which given their low black holes masses, must have
high accretion rates to meet survey flux limits. These classes have mass
corrections downward of about a factor of two, on average. These results
strengthen the association of the dominant Eigenvector 1 parameter
$\mathcal{R}_{\rm Fe}$ with the accretion process.
|
[
"astro-ph.GA"
] |
astro-ph.GA
|
Astrophysics of Galaxies
| 464Astrophysics of Galaxies
|
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