publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
|---|---|---|---|
2002-06-17 | Damped Bloch oscillations of cold atoms in optical lattices | The paper studies Bloch oscillations of cold neutral atoms in the optical
lattice. The effect of spontaneous emission on the dynamics of the system is
analyzed both analytically and numerically. The spontaneous emission is shown
to cause (i) the decay of Bloch oscillations with the decrement given by the
rate of sponta... | 0206108v1 |
2005-06-22 | A degenerate three-level laser with a parametric amplifier | The aim of this paper is to study the squeezing and statistical properties of
the light produced by a degenerate three-level laser whose cavity contains a
degenerate parametric amplifier. In this quantum optical system the top and
bottom levels of the three-level atoms injected into the laser cavity are
coupled by the ... | 0506178v3 |
2006-04-28 | Purity of states in the theory of open quantum systems | The condition of purity of states for a damped harmonic oscillator is
considered in the framework of Lindblad theory for open quantum systems. For a
special choice of the environment coefficients, the correlated coherent states
are shown to be the only states which remain pure all the time during the
evolution of the c... | 0604212v1 |
2007-05-08 | Theoretical Analysis of Subthreshold Oscillatory Behaviors in Nonlinear Autonomous Systems | We have developed a linearization method to investigate the subthreshold
oscillatory behaviors in nonlinear autonomous systems. By considering firstly
the neuronal system as an example, we show that this theoretical approach can
predict quantitatively the subthreshold oscillatory activities, including the
damping coeff... | 0705.1019v1 |
2007-06-03 | A class of series acceleration formulae for Catalan's constant | In this note, we develop transformation formulae and expansions for the log
tangent integral, which are then used to derive series acceleration formulae
for certain values of Dirichlet L-functions, such as Catalan's constant. The
formulae are characterized by the presence of an infinite series whose general
term consis... | 0706.0356v1 |
2007-08-21 | Dimer diffusion in a washboard potential | The transport of a dimer, consisting of two Brownian particles bounded by a
harmonic potential, moving on a periodic substrate is investigated both
numerically and analytically. The mobility and diffusion of the dimer center of
mass present distinct properties when compared with those of a monomer under
the same transp... | 0708.2858v2 |
2007-10-25 | Casimir energy and entropy between dissipative mirrors | We discuss the Casimir effect between two identical, parallel slabs,
emphasizing the role of dissipation and temperature. Starting from quite
general assumptions, we analyze the behavior of the Casimir entropy in the
limit T->0 and link it to the behavior of the slab's reflection coefficients at
low frequencies. We als... | 0710.4915v2 |
2007-12-19 | Hyperon bulk viscosity in the presence of antikaon condensate | We investigate the hyperon bulk viscosity due to the non-leptonic process $n
+ p \rightleftharpoons p + \Lambda $ in $K^-$ condensed matter and its effect
on the r-mode instability in neutron stars. We find that the hyperon bulk
viscosity coefficient in the presence of antikaon condensate is suppressed
compared with th... | 0712.3171v2 |
2008-06-24 | A Gear-like Predictor-Corrector method for Brownian Dynamics Simulation | We introduce a Predictor-Corrector type method suitable for performing
many-particle Brownian Dynamics simulations. Since the method goes over to the
Gear's method for Molecular Dynamics simulation in the limit of vanishing
friction, we refer to it as a Gear-like algorithm. The algorithm has been
tested on a one-dimens... | 0806.3912v2 |
2008-08-29 | Kramers Theory for Conformational Transitions of Macromolecules | We consider the application of Kramers theory to the microscopic calculation
of rates of conformational transitions of macromolecules. The main difficulty
in such an approach is to locate the transition state in a huge configuration
space. We present a method which identifies the transition state along the most
probabl... | 0809.0027v1 |
2008-12-30 | Bulk viscosity of strange matter and r-modes in neutron stars | We discuss bulk viscosity due to non-leptonic processes involving hyperons
and Bose-Einstein condensate of negatively charged kaons in neutron stars. It
is noted that the hyperon bulk viscosity coefficient is a few order of
magnitude larger than that of the case with the condensate. Further it is found
that the hyperon... | 0812.5021v1 |
2009-05-01 | Asymptotic behavior of second-order dissipative evolution equations combining potential with non-potential effects | We study the asymptotic convergence properties, as the time variable goes to
infinity, of trajectories of second-order dissipative evolution equations
combining potential with non-potential effects. We exhibit a sharp condition,
involving the damping parameter and the cocoercive coefficient of the
non-potential operato... | 0905.0092v1 |
2010-02-09 | The pulse and monochromatic light stimulation of semiconductor quantum wells | The light reflectance and absorbance are calculated for a quantum well (QW)
the width of which is comparable with the light wave length. The difference of
the refraction coefficients of the quantum well and barriers is taken into
account. The stimulating pulse form is arbitrary. An existence of two closely
situated dis... | 1002.1780v1 |
2010-02-09 | Asymptotical photon distributions in the dissipative Dynamical Casimir Effect | Asymptotical formulas for the photon distribution function of a quantum
oscillator with time-dependent frequency and damping coefficients, interacting
with a thermal reservoir, are derived in the case of a large mean number of
quanta. Different regimes of excitation of an initial thermal state with an
arbitrary tempera... | 1002.1861v1 |
2010-03-12 | Symmetry Analysis of 2+1 dimensional Burgers equation with variable damping | The symmetry classification of the two dimensional Burgers equation with
variable coefficient is considered. Symmetry algebra is found and a
classification of its subalgebras, up to conjugacy, is obtained. Similarity
reductions are performed for each class. | 1003.2511v1 |
2010-06-14 | Transport parameters in neutron stars from in-medium NN cross sections | We present a numerical study of shear viscosity and thermal conductivity of
symmetric nuclear matter, pure neutron matter and $\beta$-stable nuclear
matter, in the framework of the Brueckner theory. The calculation of in-medium
cross sections and nucleon effective masses is performed with a consistent two
and three bod... | 1006.2656v1 |
2010-12-10 | Spin-orbit driven ferromagnetic resonance: A nanoscale magnetic characterisation technique | We demonstrate a scalable new ferromagnetic resonance (FMR) technique based
on the spin-orbit interaction. An alternating current drives FMR in uniform
ferromagnetic structures patterned from the dilute magnetic semiconductors
(Ga,Mn)As and (Ga,Mn)(As,P). This allows the direct measurement of magnetic
anisotropy coeffi... | 1012.2397v1 |
2011-09-28 | Local solvability and loss of smoothness of the Navier-Stokes-Maxwell equations with large initial data | Existence of local-in-time unique solution and loss of smoothness of full
Magnet-Hydro-Dynamics system (MHD) is considered for periodic initial data. The
result is proven using Fujita-Kato's method in $\ell^1$ based (for the Fourier
coefficients) functional spaces enabling us to easily estimate nonlinear terms
in the s... | 1109.6089v1 |
2011-12-12 | On the vanishing electron-mass limit in plasma hydrodynamics in unbounded media | We consider the zero-electron-mass limit for the Navier-Stokes-Poisson system
in unbounded spatial domains. Assuming smallness of the viscosity coefficient
and ill-prepared initial data, we show that the asymptotic limit is represented
by the incompressible Navier-Stokes system, with a Brinkman damping, in the
case whe... | 1112.2562v1 |
2014-05-03 | Lie Symmetry Classification and Numerical Analysis of KdV Equation with Power-law Nonlinearity | In this paper, a complete Lie symmetry analysis of the damped wave equation
with time-dependent coefficients is investigated. Then the invariant solutions
and the exact solutions generated from the symmetries are presented. Moreover,
a Lie algebraic classifications and the optimal system are discussed. Finally,
using C... | 1405.0592v3 |
2015-02-22 | Fractional extension of Kramers rate and barrier escaping from metastable potential well | The reactive process of barrier escaping from the metastable potential well
is studied together with the extension of Kramers' rate formula to the
fractional case. Characteristic quantities are computed for an thimbleful of
insight into the near barrier escaping and recrossing dynamics. Where the
stationary transmissio... | 1502.06184v1 |
2016-02-20 | Synchronization of two couple pendula in absence of escapement | A model of two oscillating pendula placed on a mobile support is studied.
Once an overall scheme of equations, under general assumptions, is formulated
via the Lagrangian equations of motion, the specific case of absence of
escapement is examined. The mechanical models consists of two coupled pendula
both oscillating o... | 1602.06382v1 |
2016-06-06 | Weak invariants of time-dependent quantum dissipative systems | The concept of weak invariant is introduced. Then, the weak invariants
associated with time-dependent quantum dissipative systems are discussed in the
context of master equations of the Lindblad type. In particular, with the help
of the su(1,1) Lie-algebraic structure, the weak invariant is explicitly
constructed for t... | 1606.01767v4 |
2017-06-25 | Influence of qubits' nonradiative decay into a common bath on the transport properties of microwave photons | We consider the influence of nonradiative damping of qubits on the microwave
transport of photons, propagating in an open one-dimensional microstrip line.
Within the framework of the formalism of a non-Hermitian Hamiltonian we
obtained the expressions for the transmission and reflection coefficients for
two qubits whic... | 1706.08028v2 |
2018-07-17 | Energy decay for evolution equations with delay feedbacks | We study abstract linear and nonlinear evolutionary systems with single or
multiple delay feedbacks, illustrated by several concrete examples. In
particular, we assume that the operator associated with the undelayed part of
the system generates an exponentially stable semigroup and that the delay
damping coefficients a... | 1807.06445v2 |
2018-08-22 | Weak convergence of Euler-Maruyama's approximation for SDEs under integrability condition | This work establishes the weak convergence of Euler-Maruyama's approximation
for stochastic differential equations (SDEs) with singular drifts under the
integrability condition in lieu of the widely used growth condition. This
method is based on a skillful application of the dimension-free Harnack
inequality. Moreover,... | 1808.07250v1 |
2019-11-30 | Robustness Evaluation of the Butterfly Optimization Algorithm on a Control System | In this paper, the Butterfly Optimization Algorithm (BOA) proposed by [1] is
adopted to optimize the parameters of a designed Lead-Lad Controller so as to
obtain a stabilized control system. Numerical analysis was carried out for BOA
on the control problem and the results are compared to those obtained from the
well kn... | 1912.00185v1 |
2019-12-05 | Blow up for small-amplitude semilinear wave equations with mixed nonlinearities on asymptotically Euclidean manifolds | In this work, we investigate the problem of finite time blow up as well as
the upper bound estimates of lifespan for solutions to small-amplitude
semilinear wave equations with mixed nonlinearities $a |u_t|^p+b |u|^q$, posed
on asymptotically Euclidean manifolds, which is related to both the Strauss
conjecture and Glas... | 1912.02561v1 |
2020-03-16 | Extreme Hawking Radiation | Modeling the collapse of an extreme Reissner-Nordstr\"om (ERN) black hole by
solving the corresponding moving mirror model for the trajectory that
asymptotically approaches uniform acceleration, we obtain the non-zero beta
coefficients for all times. Finite energy is emitted, the radiation spectra is
non-thermal (non-s... | 2003.07016v1 |
2021-02-01 | Comment on "Deformed Fokker-Planck equation: inhomogeneous medium with a position-dependent mass" | In a recent paper by B. G. da Costa {\it et al.} [Phys. Rev. E 102,
062105(2020)], the phenomenological Langevin equation and the corresponding
Fokker-Planck equation for an inhomogeneous medium with a position-dependent
particle mass and position-dependent damping coefficient have been studied. The
aim of this comment... | 2102.00699v1 |
2021-02-05 | Nonequilibrium statistical mechanics of crystals | The local equilibrium approach previously developed by the Authors [J.
Mabillard and P. Gaspard, J. Stat. Mech. (2020) 103203] for matter with broken
symmetries is applied to crystalline solids. The macroscopic hydrodynamics of
crystals and their local thermodynamic and transport properties are deduced
from the microsc... | 2102.03096v1 |
2021-03-14 | A note on damped wave equations with a nonlinear dissipation in non-cylindrical domains | In this paper, we study the large time behavior of a class of wave equation
with a nonlinear dissipation in non-cylindrical domains. The result we obtained
here relaxes the conditions for the nonlinear term coefficients (in precise,
that is $\beta(t)|u|^\rho u$) in \cite{alb} and \cite{ha} (which require
$\beta(t)$ to ... | 2103.09678v2 |
2021-03-28 | Skyrmion elongation, duplication and rotation by spin-transfer torque under spatially varying spin current | The effect of the spatially varying spin current on a skyrmion is numerically
investigated. It is shown that an inhomogeneous current density induces an
elongation of the skyrmion. This elongation can be controlled using current
pulses of different strength and duration. Long current pulses lead to a
splitting that for... | 2103.15094v1 |
2021-05-13 | Thermal instability in a ferrimagnetic resonator strongly coupled to a loop-gap microwave cavity | We study nonlinear response of a ferrimagnetic sphere resonator (FSR)
strongly coupled to a microwave loop gap resonator (LGR). The measured response
in the regime of weak nonlinearity allows the extraction of the FSR Kerr
coefficient and its cubic damping rate. We find that there is a certain range
of driving paramete... | 2105.06102v2 |
2022-01-25 | A fully adaptive explicit stabilized integrator for advection-diffusion-reaction problems | A novel second order family of explicit stabilized Runge-Kutta-Chebyshev
methods for advection-diffusion-reaction equations is introduced. The new
methods outperform existing schemes for relatively high Peclet number due to
their favorable stability properties and explicitly available coefficients. The
construction of ... | 2201.10206v2 |
2022-11-08 | Current and diffusion of Overdamped Active Brownian Particles in a Ratchet Potential | The transport properties of a spherical active Brownian particle in a
periodic potential under heavy damping are considered. The self-propelled
particle is subjected to the asymmetric potential, detailed balance is lost and
the particles generate a non-zero drift speed.
The average current is calculated and the diffu... | 2211.04298v1 |
2022-12-24 | Anisotropic acoustics in dipolar Fermi gases | We consider plane wave modes in ultracold, but not quantum degenerate,
dipolar Fermi gases in the hydrodynamic limit. Longitudinal waves present
anisotropies in both the speed of sound and their damping, and experience a
small, undulatory effect in their flow velocity. Two distinct types of shear
waves appear, a ``fami... | 2212.12659v1 |
2023-02-09 | Two-loop hard thermal loops for any model | Hard thermal loops describe how soft gauge fields are screened and damped in
hot plasmas. As such they are used to calculate transport coefficients,
Sphaleron rates, equations of state, and particle production. However, most
calculations are done using one-loop self-energies. And two-loop contributions
can be large. To... | 2302.04894v1 |
2024-01-29 | Dissipative effects on the propagation of spin modes | In relativistic hydrodynamics with spin, following de Groot--van Leeuwen--van
Weert's energy-momentum and spin tensor definitions, we analyze the propagation
of spin degrees of freedom. We deduce an analytical formula for spin wave
velocity, finding that it approaches half the speed of light in the
ultra-relativistic l... | 2401.16007v1 |
2024-03-05 | Microscopic parametrization of the near threshold oscillations of the nucleon time-like effective electromagnetic form factors | We present an analysis of the recent near threshold BESIII data for the
nucleon time-like effective form factors. The damped oscillation emerging from
the subtraction of the dipole formula is treated in non-perturbative-QCD,
making use of the light cone distribution amplitudes expansion.
Non-perturbative effects are ac... | 2403.02916v1 |
2017-07-28 | Measurements of the Temperature and E-Mode Polarization of the CMB from 500 Square Degrees of SPTpol Data | We present measurements of the $E$-mode polarization angular auto-power
spectrum ($EE$) and temperature-$E$-mode cross-power spectrum ($TE$) of the
cosmic microwave background (CMB) using 150 GHz data from three seasons of
SPTpol observations. We report the power spectra over the spherical harmonic
multipole range $50 ... | 1707.09353v3 |
1999-04-13 | Damping of Collective Nuclear Motion and Thermodynamic Properties of Nuclei beyond Mean Field | The dynamical description of correlated nuclear motion is based on a set of
coupled equations of motion for the one-body density matrix $\rho (11';t)$ and
the two-body correlation function $c_2(12,1'2';t)$, which is obtained from the
density-matrix hierarchy beyond conventional mean-field approaches by
truncating 3-bod... | 9904034v1 |
2010-09-30 | An efficient numerical algorithm for the L2 optimal transport problem with applications to image processing | We present a numerical method to solve the optimal transport problem with a
quadratic cost when the source and target measures are periodic probability
densities. This method is based on a numerical resolution of the corresponding
Monge-Amp\`ere equation. We extend the damped Newton algorithm of Loeper and
Rapetti \cit... | 1009.6039v2 |
2010-10-13 | Global Uniqueness and Stability in Determining the Damping Coefficient of an Inverse Hyperbolic Problem with Non-Homogeneous Neumann B.C. through an Additional Dirichlet Boundary Trace | We consider a second-order hyperbolic equation on an open bounded domain
$\Omega$ in $\mathbb{R}^n$ for $n\geq2$, with $C^2$-boundary
$\Gamma=\pa\Omega=\bar{\Gamma_0\cup\Gamma_1}$,
$\Gamma_0\cap\Gamma_1=\emptyset$, subject to non-homogeneous Neumann boundary
conditions on the entire boundary $\Gamma$. We then study the... | 1010.2696v2 |
2013-10-31 | Impurity Screening and Surface Acoustic Wave Absorption in a Dipolar Exciton Condensate at Finite Temperatures | We describe the behavior of a repulsively interacting Bose-Einstein
condensate of indirect dipolar exciton gas in a double quantum well (QW) system
under external static or dynamic electric fields at finite temperatures.
Electrostatic perturbation is considered to be created by an impurity atom or
shot-range defect of ... | 1310.8394v1 |
2015-04-05 | Stability of non-autonomous difference equations with applications to transport and wave propagation on networks | In this paper, we address the stability of transport systems and wave
propagation on networks with time-varying parameters. We do so by reformulating
these systems as non-autonomous difference equations and by providing a
suitable representation of their solutions in terms of their initial conditions
and some time-depe... | 1504.01116v4 |
2016-11-24 | Zero-Point Energy Leakage in Quantum Thermal Bath Molecular Dynamics Simulations | The quantum thermal bath (QTB) has been presented as analternative to
path-integral-based methods to introduce nuclear quantumeffects in molecular
dynamics simulations. The method has proved to beefficient, yielding accurate
results for various systems. However, the QTBmethod is prone to zero-point
energy leakage (ZPEL... | 1611.08221v1 |
2016-12-11 | Temperature dependence of the plastic scintillator detector for DAMPE | The Plastic Scintillator Detector (PSD) is one of the main sub-detectors in
the DArk Matter Particle Explorer (DAMPE) project. It will be operated over a
large temperature range from -$10$ to $30^{\circ}$C, so the temperature effect
of the whole detection system should be studied in detail. The temperature
dependence o... | 1612.03398v1 |
2017-05-09 | Recovery of mechanical pressure in a gas of underdamped active dumbbells with Brownian noise | In contrast with a gas at thermodynamic equilibrium, the mean force exerted
on a wall by a gas of active particles usually depends on the confining
potential, thereby preventing a proper definition of mechanical pressure. In
this paper, we investigate numerically the properties of a gas of underdamped
self-propelled du... | 1705.03291v1 |
2017-11-27 | Colloidal particle adsorption at water/water interfaces with ultra-low interfacial tension | Using fluorescence microscopy we study the adsorption of single latex
microparticles at a water/water interface between demixing aqueous solutions of
polymers, generally known as a water-in-water emulsion. Similar microparticles
at the interface between molecular liquids have exhibited an extremely slow
relaxation prev... | 1711.10024v2 |
2018-09-19 | Magnetic non-contact friction from domain wall dynamics actuated by oscillatory mechanical motion | Magnetic friction is a form of non-contact friction arising from the
dissipation of energy in a magnet due to spin reorientation in a magnetic
field. In this paper we study magnetic friction in the context of
micromagnetics, using our recent implementation of smooth spring-driven motion
[Phys. Rev. E. 97, 053301 (2018)... | 1809.07130v2 |
2019-09-29 | Tunable parametric amplification of a graphene nanomechanical resonator in the nonlinear regime | Parametric amplification is widely used in nanoelectro-mechanical systems to
enhance the transduced mechanical signals. Although parametric amplification
has been studied in different mechanical resonator systems, the nonlinear
dynamics involved receives less attention. Taking advantage of the excellent
electrical and ... | 1909.13219v2 |
2019-11-21 | Cosmic ray transport in starburst galaxies | Starburst galaxies are efficient $\gamma$-ray producers, because their high
supernova rates generate copious cosmic ray (CR) protons, and their high gas
densities act as thick targets off which these protons can produce neutral
pions and thence $\gamma$-rays. In this paper we present a first-principles
calculation of t... | 1911.09774v2 |
2020-12-01 | Solvable Theory of a Strange Metal at the Breakdown of a Heavy Fermi Liquid | We introduce an effective theory for quantum critical points (QCPs) in heavy
fermion systems, involving a change in carrier density without symmetry
breaking. Our new theory captures a strongly coupled metallic QCP, leading to
robust marginal Fermi liquid transport phenomenology, and associated linear in
temperature ($... | 2012.00763v2 |
2021-11-30 | Transient Stability of Low-Inertia Power Systems with Inverter-Based Generation | This study examines the transient stability of low-inertia power systems with
inverter-based generation (IBG) and proposes a sufficient stability criterion.
In low-inertia grids, transient interactions are induced between the
electromagnetic dynamics of the IBG and the electromechanical dynamics of the
synchronous gene... | 2111.15380v3 |
2023-10-12 | An improved dynamical Poisson equation solver for self-gravity | Since self-gravity is crucial in the structure formation of the universe,
many hydrodynamics simulations with the effect of self-gravity have been
conducted. The multigrid method is widely used as a solver for the Poisson
equation of the self-gravity; however, the parallelization efficiency of the
multigrid method beco... | 2310.08030v1 |
2002-01-31 | Electron impact excitation of helium-like oxygen up to n = 4 levels including radiation damping | The primary X-ray diagnostic lines in He-like ions are mainly excited by
electron impact from the ground level to the n = 2 levels, but at high
temperatures n > 2 levels are also excited. In order to describe the atomic
processes more completely collision strengths are computed for OVII including
for the first time all... | 0201535v1 |
2015-10-10 | Boundary layers and incompressible Navier-Stokes-Fourier limit of the Boltzmann Equation in Bounded Domain (I) | We establish the incompressible Navier-Stokes-Fourier limit for solutions to
the Boltzmann equation with a general cut-off collision kernel in a bounded
domain. Appropriately scaled families of DiPerna-Lions-(Mischler) renormalized
solutions with Maxwell reflection boundary conditions are shown to have
fluctuations tha... | 1510.02977v1 |
2017-12-05 | Harnessing Electrical Power from Vortex-Induced Vibration of a Circular Cylinder | The generation of electrical power from Vortex-Induced Vibration (VIV) of a
cylinder is investigated numerically. The cylinder is free to oscillate in the
direction transverse to the incoming flow. The cylinder is attached to a magnet
that can move along the axis of a coil made from conducting wire. The magnet
and the ... | 1712.01588v1 |
2020-02-14 | Testing Physical Models for Cosmic Ray Transport Coefficients on Galactic Scales: Self-Confinement and Extrinsic Turbulence at GeV Energies | The microphysics of ~GeV cosmic ray (CR) transport on galactic scales remain
deeply uncertain, with almost all studies adopting simple prescriptions (e.g.
constant-diffusivity). We explore different physically-motivated, anisotropic,
dynamical CR transport scalings in high-resolution cosmological FIRE
simulations of dw... | 2002.06211v2 |
2023-12-25 | IMEX-RK methods for Landau-Lifshitz equation with arbitrary damping | Magnetization dynamics in ferromagnetic materials is modeled by the
Landau-Lifshitz (LL) equation, a nonlinear system of partial differential
equations. Among the numerical approaches, semi-implicit schemes are widely
used in the micromagnetics simulation, due to a nice compromise between
accuracy and efficiency. At ea... | 2312.15654v1 |
2020-07-21 | Random walk of a massive quasiparticle in the phonon gas of an ultralow temperature superfluid | We consider a 3D homogeneous superfluid at low temperature $T$ with 2 types
of excitations, gapless phonons with a linear dispersion relation at low
wavenumber, and gapped quasiparticles with a quadratic dispersion relation
around extrema. We calculate the scattering amplitude of a phonon on a
quasiparticle to leading ... | 2007.10678v2 |
1998-09-15 | Solid friction at high sliding velocities: an explicit 3D dynamical SPH approach | We present realistic 3D numerical simulations of elastic bodies sliding on
top of each other in a regime of velocities ranging from meters to tens of
meters per second using the so-called Smoothed Particle Hydrodynamics (SPH)
method. Our investigations are restricted to regimes of pressure and roughness
where only elas... | 9809213v1 |
2011-11-25 | Application of a damped Locally Optimized Combination of Images method to the spectral characterization of faint companions using an Integral Field Spectrograph | High-contrast imaging instruments are now being equipped with integral field
spectrographs (IFS) to facilitate the detection and characterization of faint
substellar companions. Algorithms currently envisioned to handle IFS data, such
as the Locally Optimized Combination of Images (LOCI) algorithm, rely upon
aggressive... | 1111.6102v1 |
2024-03-04 | Exploring Standing and Reflected Slow-mode Waves in Flaring Coronal Loops: A Parametric Study Using 2.5D MHD Modeling | Recent observations of reflected propagating and standing slow-mode waves in
hot flaring coronal loops have spurred our investigation into their underlying
excitation and damping mechanisms. To understand these processes, we conduct
2.5D magnetohydrodynamic (MHD) simulations using an arcade active region model
that inc... | 2403.02464v1 |
2021-02-09 | Binet's factorial series and extensions to Laplace transforms | We investigate a generalization of Binet's factorial series in the parameter
$\alpha$ \[ \mu\left( z\right) =\sum_{m=1}^{\infty}\frac{b_{m}\left(
\alpha\right) }{\prod_{k=0}^{m-1}(z+\alpha+k)}% \] due to Gilbert, for the
Binet function \[ \mu\left( z\right) =\log\Gamma\left( z\right) -\left(
z-\frac{1} {2}\right) \log ... | 2102.04891v7 |
2002-06-26 | General Formula for the Thermoelectric Transport Phenomena based on the Fermi Liquid Theory: Thermopower, Nernst Coefficient, and Thermal Conductivity | On the basis of the linear response transport theory, the general expressions
for the thermoelectric transport coefficients, such as thermoelectric power
(S), Nernst coefficient (\nu), and thermal conductivity (\kappa), are derived
by using the Fermi liquid theory. The obtained expression is exact as for the
most singu... | 0206501v3 |
2012-12-05 | Stationary two-dimensional turbulence statistics using a Markovian forcing scheme | In this study we investigate the statistics of two-dimensional stationary
turbulence using a Markovian forcing scheme, which correlates the forcing
process in the current time step to the previous time step according to a
defined memory coefficient. In addition to the Markovian forcing mechanism, the
hyperviscous dissi... | 1212.0916v1 |
2023-06-12 | Dynamics of the $O(4)$ critical point in QCD: critical pions and diffusion in Model G | We present a detailed study of the finite momentum dynamics of the $O(4)$
critical point of QCD, which lies in the dynamic universality class of Model G.
The critical scaling of the model is analyzed in multiple dynamical channels.
For instance, the finite momentum analysis allows us to precisely extract the
pion dispe... | 2306.06887v2 |
2024-03-12 | Cosmic Ray Feedback on Bi-stable ISM Turbulence | Despite being energetically important, the effect of cosmic rays on the
dynamics of the interstellar medium (ISM) is assumed to be negligible because
the cosmic ray energy diffusion coefficient parallel to the magnetic field is
relatively large. Using numerical simulations, we explore how variation of the
cosmic ray di... | 2403.07976v1 |
2023-10-11 | High-speed photonic crystal modulator with non-volatile memory via structurally-engineered strain concentration in a piezo-MEMS platform | Numerous applications in quantum and classical optics require scalable,
high-speed modulators that cover visible-NIR wavelengths with low footprint,
drive voltage (V) and power dissipation. A critical figure of merit for
electro-optic (EO) modulators is the transmission change per voltage, dT/dV.
Conventional approache... | 2310.07798v2 |
2000-05-29 | Entropy Production in a Persistent Random Walk | We consider a one-dimensional persisent random walk viewed as a deterministic
process with a form of time reversal symmetry. Particle reservoirs placed at
both ends of the system induce a density current which drives the system out of
equilibrium. The phase space distribution is singular in the stationary state
and has... | 0005063v1 |
2012-12-13 | A convergent finite element approximation for the quasi-static Maxwell--Landau--Lifshitz--Gilbert equations | We propose a $\theta$-linear scheme for the numerical solution of the
quasi-static Maxwell-Landau-Lifshitz-Gilbert (MLLG) equations. Despite the
strong nonlinearity of the Landau-Lifshitz-Gilbert equation, the proposed
method results in a linear system at each time step. We prove that as the time
and space steps tend t... | 1212.3369v1 |
2013-09-28 | Global Well-Posedness of the Landau-Lifshitz-Gilbert equation for initial data in Morrey space | We establish the global well-posedness of the Landau-Lifshitz-Gilbert
equation in $\mathbb R^n$ for any initial data ${\bf m}_0\in H^1_*(\mathbb
R^n,\mathbb S^2)$ whose gradient belongs to the Morrey space $M^{2,2}(\mathbb
R^n)$ with small norm $\displaystyle\|\nabla {\bf m}_0\|_{M^{2,2}(\mathbb
R^n)}$. The method is b... | 1309.7426v1 |
2016-10-26 | Iterated Gilbert Mosaics and Poisson Tropical Plane Curves | We propose an iterated version of the Gilbert model, which results in a
sequence of random mosaics of the plane. We prove that under appropriate
scaling, this sequence of mosaics converges to that obtained by a classical
Poisson line process with explicit cylindrical measure. Our model arises from
considerations on tro... | 1610.08533v1 |
2017-05-29 | Strong solvability of regularized stochastic Landau-Lifshitz-Gilbert equation | We examine a stochastic Landau-Lifshitz-Gilbert equation based on an exchange
energy functional containing second-order derivatives of the unknown field.
Such regularizations are featured in advanced micromagnetic models recently
introduced in connection with nanoscale topological solitons. We show that, in
contrast to... | 1705.10184v1 |
2021-04-03 | Improving the Gilbert-Varshamov Bound by Graph Spectral Method | We improve Gilbert-Varshamov bound by graph spectral method. Gilbert graph
$G_{q,n,d}$ is a graph with all vectors in $\mathbb{F}_q^n$ as vertices where
two vertices are adjacent if their Hamming distance is less than $d$. In this
paper, we calculate the eigenvalues and eigenvectors of $G_{q,n,d}$ using the
properties ... | 2104.01403v3 |
2000-05-10 | Hydrodynamical Survey of First Overtone Cepheids | A hydrodynamical survey of the pulsational properties of first overtone
Galactic Cepheids is presented. The goal of this study is to reproduce their
observed light- and radial velocity curves. The comparison between the models
and the observations is made in a quantitative manner on the level of the
Fourier coefficient... | 0005230v2 |
2007-02-09 | Bulk viscosity in kaon condensed matter | We investigate the effect of $K^-$ condensed matter on bulk viscosity and
r-mode instability in neutron stars. The bulk viscosity coefficient due to the
non-leptonic process $n \rightleftharpoons p + K^-$ is studied here. In this
connection, equations of state are constructed within the framework of
relativistic field ... | 0702259v2 |
2005-07-28 | Theory of transverse spin dynamics in a polarized Fermi liquid and an itinerant ferromagnet | The linear equations for transverse spin dynamics in a weakly polarized
degenerate Fermi liquid with arbitrary relationship between temperature and
polarization are derived from Landau-Silin phenomenological kinetic equation
with general form of two-particle collision integral. Unlike the previous
treatment where Fermi... | 0507675v1 |
1993-12-02 | Standard Model CP-violation and Baryon asymmetry | Simply based on CP arguments, we argue against a Standard Model explanation
of the baryon asymmetry of the universe in the presence of a first order phase
transition. A CP-asymmetry is found in the reflection coefficients of quarks
hitting the phase boundary created during the electroweak transition. The
problem is ana... | 9312215v1 |
1996-04-17 | Variation of transport coefficients for average fission dynamics with temperature and shape | We study slow collective motion at finite thermal excitations on the basis of
linear response theory applied to the locally harmonic approximation. The
transport coefficients for average motion, friction \gamma, inertia M and the
local stiffness C are computed along a fission path of Th-224 within a
quasi-static pictur... | 9604024v3 |
2001-03-05 | Nuclear fission: The "onset of dissipation" from a microscopic point of view | Semi-analytical expressions are suggested for the temperature dependence of
those combinations of transport coefficients which govern the fission process.
This is based on experience with numerical calculations within the linear
response approach and the locally harmonic approximation. A reduced version of
the latter i... | 0103013v3 |
2008-12-08 | Partial integrability of the anharmonic oscillator | We consider the anharmonic oscillator with an arbitrary-degree anharmonicity,
a damping term and a forcing term, all coefficients being time-dependent: u" +
g_1(x) u' + g_2(x) u + g_3(x) u^n + g_4(x) = 0, n real. Its physical
applications range from the atomic Thomas-Fermi model to Emden gas dynamics
equilibria, the Du... | 0812.1451v1 |
2010-11-29 | Viscous lock-exchange in rectangular channels | In a viscous lock-exchange gravity current, which describes the reciprocal
exchange of two fluids of different densities in a horizontal channel, the
front between two Newtonian fluids spreads as the square root of time. The
resulting diffusion coefficient reflects the competition between the buoyancy
driving effect an... | 1011.6262v1 |
2011-02-15 | Decay of energy and suppression of Fermi acceleration in a dissipative driven stadium-like billiard | The behavior of the average energy for an ensemble of non-interacting
particles is studied using scaling arguments in a dissipative time-dependent
stadium-like billiard. The dynamics of the system is described by a four
dimensional nonlinear mapping. The dissipation is introduced via inelastic
collisions between the pa... | 1102.3139v4 |
2012-05-31 | Spin diffusion of lattice fermions in one dimension | We study long-time spin diffusion of harmonically trapped lattice fermions in
one dimension. Combining thermodynamic Bethe ansatz approach and local density
approximation, we calculate spin current and spin diffusion coefficient driven
by the population imbalance. We find spin current is driven by susceptibility
effect... | 1205.7019v2 |
2012-11-15 | A localized orthogonal decomposition method for semi-linear elliptic problems | In this paper we propose and analyze a new Multiscale Method for solving
semi-linear elliptic problems with heterogeneous and highly variable
coefficient functions. For this purpose we construct a generalized finite
element basis that spans a low dimensional multiscale space. The basis is
assembled by performing locali... | 1211.3551v2 |
2014-11-27 | Transport coefficients in superfluid neutron stars | We study the shear and bulk viscosity coefficients as well as the thermal
conductivity as arising from the collisions among phonons in superfluid neutron
stars. We use effective field theory techniques to extract the allowed phonon
collisional processes, written as a function of the equation of state and the
gap of the... | 1411.7622v1 |
2015-02-19 | Nonequilibrium inhomogeneous steady state distribution in disordered, mean-field rotator systems | We present a novel method to compute the phase space distribution in the
nonequilibrium stationary state of a wide class of mean-field systems involving
rotators subject to quenched disordered external drive and dissipation. The
method involves a series expansion of the stationary distribution in inverse of
the damping... | 1502.05559v2 |
2016-06-17 | Unveiling the scattering behavior of small spheres | A classical way for exploring the scattering behavior of a small sphere is to
approximate Mie coefficients with a Taylor series expansion. This ansatz
delivered a plethora of insightful results, mostly for small spheres supporting
localized plasmonic resonances. However, many scattering aspects are still
uncharted, esp... | 1606.05523v4 |
2016-08-08 | Simulations of Energetic Particles Interacting with Nonlinear Anisotropic Dynamical Turbulence | We investigate test-particle diffusion in dynamical turbulence based on a
numerical approach presented before. For the turbulence we employ the nonlinear
anisotropic dynamical turbulence model which takes into account wave
propagation effects as well as damping effects. We compute numerically
diffusion coefficients of ... | 1609.05226v1 |
2017-02-06 | General Scattering Characteristics of Resonant Core-Shell Spheres | This article presents and discusses the general features and aspects
regarding the electromagnetic scattering by a small core-shell plasmonic
sphere. First, the thickness effects on the plasmonic resonances are presented
in the electrostatic (Rayleigh) limit, utilizing the MacLaurin expansion of the
Mie coefficients of... | 1702.01620v2 |
2017-07-10 | Model Identification and Controller Parameter Optimization for an Autopilot Design for Autonomous Underwater Vehicles | Nowadays an accurate modeling of the system to be controlled is essential for
reliable autopilot. This paper presents a non-linear model of the autonomous
underwater vehicle 'CWolf'. Matrices and the corresponding coefficients
generate a parameterized representation for added mass, Coriolis and
centripetal forces, damp... | 1707.02767v1 |
2017-08-06 | Dynamics and locomotion of flexible foils in a frictional environment | Over the past few decades, oscillating flexible foils have been used to study
the physics of organismal propulsion in different fluid environments. Here we
extend this work to a study of flexible foils in a frictional environment. When
the foil is oscillated by heaving at one end but not allowed to locomote
freely, the... | 1708.01827v1 |
2017-09-19 | On well-posedness of Ericksen-Leslie's hyperbolic incompressible liquid crystal model | We study the Ericksen-Leslie's hyperbolic incompressible liquid crystal
model. Under some constraints on the Leslie coefficients which ensure the basic
energy law is dissipative, we prove the local-in-time existence and uniqueness
of the classical solution to the system with finite initial energy.
Furthermore, with an ... | 1709.06370v3 |
2017-09-19 | Higher-order Fermi-liquid corrections for an Anderson impurity away from half-filling | We study the higher-order Fermi-liquid relations of Kondo systems for
arbitrary impurity-electron fillings, extending the many-body quantum
theoretical approach of Yamada-Yosida. It includes partly a microscopic
clarification of the related achievements based on Nozi\`{e}res'
phenomenological description: Filippone, Mo... | 1709.06385v2 |
2019-02-06 | Solar energetic particle propagation in wave turbulence and the possibility of wave generation | A complete theory for the complex interaction between solar energetic
particles and the turbulent interplanetary magnetic field remains elusive. In
this work we aim to contribute towards such a theory by modelling the
propagation of solar energetic particle electrons in plasma wave turbulence. We
specify a background t... | 1902.02038v1 |
2019-02-20 | Influence of Physical Properties of Hockey Stick Blade on Shots | Parameters of a shot of an ice hockey player are mostly determined by the
capabilities of the player and the physical properties of the stick used. To
reach better performance, every hockey player uses also a hockey tape for an
adjustment of the stick blade, that changes both the damping properties as well
as the frict... | 1903.02635v2 |
2020-07-30 | A diffusive origin for the cosmic-ray spectral hardening reveals signatures of a nearbysource in the leptons and protons data | In this work we aim at reproducing, simultaneously, the spectral feature at
$\sim 10 \, \mathrm{TeV}$ in the cosmic-ray proton spectrum, recently reported
by the DAMPE Collaboration, together with the spectral break at $\sim 1 \,
\mathrm{TeV}$ measured by H.E.S.S. in the lepton spectrum. Those features are
interpreted ... | 2007.15321v2 |
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