publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
|---|---|---|---|
1991-09-26 | The Damping of Energetic Gluons and Quarks in High-Temperature QCD | When a gluon or a quark is sent through the hot QCD plasma it can be absorbed
into the ambient heat bath and so can acquire an effective lifetime. At high
temperatures and for weak couplings the inverse lifetime, or damping rate, for
energetic quarks and transverse gluons, (those whose momenta satisfy $|\p| \gg
gT$) is... | 9109051v1 |
2006-11-21 | Renormalization group study of damping in nonequilibrium field theory | In this paper we shall study whether dissipation in a $\lambda\phi^{4}$ may
be described, in the long wavelength, low frequency limit, with a simple Ohmic
term $\kappa\dot{\phi}$, as it is usually done, for example, in studies of
defect formation in nonequilibrium phase transitions. We shall obtain an
effective theory ... | 0611222v1 |
1997-03-26 | A self-consistent treatment of damped motion for stable and unstable collective modes | We address the dynamics of damped collective modes in terms of first and
second moments. The modes are introduced in a self-consistent fashion with the
help of a suitable application of linear response theory. Quantum effects in
the fluctuations are governed by diffusion coefficients D_{\mu\nu}. The latter
are obtained... | 9703056v1 |
1996-10-01 | Exact time evolution and master equations for the damped harmonic oscillator | Using the exact path integral solution for the damped harmonic oscillator it
is shown that in general there does not exist an exact dissipative Liouville
operator describing the dynamics of the oscillator for arbitrary initial bath
preparations. Exact non-stationary Liouville operators can be found only for
particular ... | 9610001v1 |
2007-01-30 | Charge Fluctuation of Dust Grain and Its Impact on Dusty-Acoustic Wave Damping | We consider the influence of dust charge fluctuations on damping of the
dust-ion-acoustic waves. It is assumed that all grains have equal masses but
charges are not constant in time - they may fluctuate in time. The dust charges
are not really independent of the variations in the plasma potentials. All
modes will influ... | 0701336v1 |
1999-10-05 | Uncertainty, entropy and decoherence of the damped harmonic oscillator in the Lindblad theory of open quantum systems | In the framework of the Lindblad theory for open quantum systems, expressions
for the density operator, von Neumann entropy and effective temperature of the
damped harmonic oscillator are obtained. The entropy for a state characterized
by a Wigner distribution function which is Gaussian in form is found to depend
only ... | 9910019v1 |
2007-12-11 | Neutrino oscillations in a stochastic model for space-time foam | We study decoherence models for flavour oscillations in four-dimensional
stochastically fluctuating space times and discuss briefly the sensitivity of
current neutrino experiments to such models. We pay emphasis on demonstrating
the model dependence of the associated decoherence-induced damping coefficients
in front of... | 0712.1779v1 |
2008-06-06 | On the stability of shocks with particle pressure | We perform a linear stability analysis for corrugations of a Newtonian shock,
with particle pressure included, for an arbitrary diffusion coefficient. We
study first the dispersion relation for homogeneous media, showing that,
besides the conventional pressure waves and entropy/vorticity disturbances, two
new perturbat... | 0806.1113v1 |
2008-08-26 | Nonlinear regularization techniques for seismic tomography | The effects of several nonlinear regularization techniques are discussed in
the framework of 3D seismic tomography. Traditional, linear, $\ell_2$ penalties
are compared to so-called sparsity promoting $\ell_1$ and $\ell_0$ penalties,
and a total variation penalty. Which of these algorithms is judged optimal
depends on ... | 0808.3472v3 |
2010-03-31 | Non-Markovian master equation for a damped oscillator with time-varying parameters | We derive an exact non-Markovian master equation that generalizes the
previous work [Hu, Paz and Zhang, Phys. Rev. D {\bf 45}, 2843 (1992)] to damped
harmonic oscillators with time-varying parameters. This is achieved by
exploiting the linearity of the system and operator solution in Heisenberg
picture. Our equation go... | 1003.5975v1 |
2011-06-06 | Weakly nonlinear stochastic CGL equations | We consider the linear Schr\"odinger equation under periodic boundary
condition, driven by a random force and damped by a quasilinear damping: $$
\frac{d}{dt}u+i\big(-\Delta+V(x)\big) u=\nu \Big(\Delta u-\gr |u|^{2p}u-i\gi
|u|^{2q}u \Big) +\sqrt\nu\, \eta(t,x).\qquad (*) $$ The force $\eta$ is white
in time and smooth ... | 1106.1158v1 |
2011-07-13 | Increased Brownian force noise from molecular impacts in a constrained volume | We report on residual gas damping of the motion of a macroscopic test mass
enclosed in a nearby housing in the molecular flow regime. The damping
coefficient, and thus the associated thermal force noise, is found to increase
significantly when the distance between test mass and surrounding walls is
smaller than the tes... | 1107.2520v1 |
2011-08-02 | PHENIX Measurements of Higher-order Flow Harmonics in Au+Au collisions at Root_s = 200 GeV | Flow coefficients $v_n$ for $n$ = 2, 3, 4, characterizing the anisotropic
collective flow in Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV, are
presented. They indicate the expected growth of viscous damping for sound
propagation in the quark gluon plasma (QGP) produced in these collisions.
Hydrodynamical model compari... | 1108.0457v1 |
2011-12-02 | On the simulation of the energy transmission in the forbidden band-gap of a spatially discrete double sine-Gordon system | In this work, we present a numerical method to consistently approximate
solutions of a spatially discrete, double sine-Gordon chain which considers the
presence of external damping. In addition to the finite-difference scheme
employed to approximate the solution of the difference-differential equations
of the model und... | 1112.0595v1 |
2013-04-15 | Vibrational Resonance in the Morse Oscillator | We investigate the occurrence of vibrational resonance in both classical and
quantum mechanical Morse oscillators driven by a biharmonic force. The
biharmonic force consists of two forces of widely different frequencies \omega
and \Omega with \Omega>>\omega. In the damped and biharmonically driven
classical Morse oscil... | 1304.3988v1 |
2013-11-27 | Encapsulated formulation of the Selective Frequency Damping method | We present an alternative "encapsulated" formulation of the Selective
Frequency Damping method for finding unstable equilibria of dynamical systems,
which is particularly useful when analysing the stability of fluid flows. The
formulation makes use of splitting methods, which means that it can be wrapped
around an exis... | 1311.7000v1 |
2014-08-04 | Collective Dynamics of Interacting Particles in Unsteady Flows | We use the Fokker-Planck equation and its moment equations to study the
collective behavior of interacting particles in unsteady one-dimensional flows.
Particles interact according to a long-range attractive and a short-range
repulsive potential field known as Morse potential. We assume Stokesian drag
force between par... | 1408.0558v1 |
2014-09-01 | Damping of Bloch oscillations: Variational solutions of the Boltzmann equation beyond linear response | Variational solutions of the Boltzmann equation usually rely on the concept
of linear response. We extend the variational approach for tight-binding models
at high entropies to a regime far beyond linear response. We analyze both
weakly interacting fermions and incoherent bosons on a lattice. We consider a
case where t... | 1409.0560v2 |
2014-12-05 | Adaptive Damping and Mean Removal for the Generalized Approximate Message Passing Algorithm | The generalized approximate message passing (GAMP) algorithm is an efficient
method of MAP or approximate-MMSE estimation of $x$ observed from a noisy
version of the transform coefficients $z = Ax$. In fact, for large zero-mean
i.i.d sub-Gaussian $A$, GAMP is characterized by a state evolution whose fixed
points, when ... | 1412.2005v1 |
2014-12-14 | An adaptive selective frequency damping method | The selective frequency damping (SFD) method is an alternative to classical
Newton's method to obtain unstable steady-state solutions of dynamical systems.
However this method has two main limitations: it does not converge for
arbitrary control parameters; and when it does converge, the time necessary to
reach the stea... | 1412.4372v1 |
2015-04-29 | Wide-Range Tunable Dynamic Property of Carbon Nanotube-Based Fibers | Carbon nanotube (CNT) fiber is formed by assembling millions of individual
tubes. The assembly feature provides the fiber with rich interface structures
and thus various ways of energy dissipation, as reflected by the non-zero loss
tangent (>0.028--0.045) at low vibration frequencies. A fiber containing
entangled CNTs ... | 1504.07881v1 |
2015-05-13 | The effect of a reversible shear transformation on plastic deformation of an amorphous solid | Molecular dynamics simulations are performed to investigate the plastic
response of a model glass to a local shear transformation in a quiescent
system. The deformation of the material is induced by a spherical inclusion
that is gradually strained into an ellipsoid of the same volume and then
reverted back into the sph... | 1505.03488v1 |
2015-10-17 | Direct evidence for minority spin gap in the Co2MnSi Heusler alloy | Half Metal Magnets are of great interest in the field of spintronics because
of their potential full spin-polarization at the Fermi level and low
magnetization damping. The high Curie temperature and predicted 0.7eV minority
spin gap make the Heusler alloy Co2MnSi very promising for applications.We
investigated the hal... | 1510.05085v1 |
2016-04-06 | Brownian motion of a matter-wave bright soliton: realizing a quantum pollen grain | Taking an open quantum systems approach, we derive a collective equation of
motion for the dynamics of a matter-wave bright soliton moving through a
thermal cloud of a distinct atomic species. The reservoir interaction involves
energy transfer without particle transfer between the soliton and thermal
cloud, thus dampin... | 1604.01487v1 |
2016-04-28 | Temperature Dependence of Viscosity in Normal Fluid $^3$He Below 800mK Determined by a Micro-electro-mechanical Oscillator | A micro-electro-mechanical system vibrating in its shear mode was used to
study the viscosity of normal liquid $^3$He from 20mK to 770mK at 3bar, 21bar,
and 29bar. The damping coefficient of the oscillator was determined by
frequency sweeps through its resonance at each temperature. Using a slide film
damping model, th... | 1604.08554v1 |
2016-06-11 | Parameter identification in a semilinear hyperbolic system | We consider the identification of a nonlinear friction law in a
one-dimensional damped wave equation from additional boundary measurements.
Well-posedness of the governing semilinear hyperbolic system is established via
semigroup theory and contraction arguments. We then investigte the inverse
problem of recovering the... | 1606.03580v1 |
2016-09-15 | Low-damping sub-10-nm thin films of lutetium iron garnet grown by molecular-beam epitaxy | We analyze the structural and magnetic characteristics of (111)-oriented
lutetium iron garnet (Lu$_3$Fe$_5$O$_{12}$) films grown by molecular-beam
epitaxy, for films as thin as 2.8 nm. Thickness-dependent measurements of the
in- and out-of-plane ferromagnetic resonance allow us to quantify the effects
of two-magnon sca... | 1609.04753v1 |
2016-10-05 | Higher-Harmonic Collective Modes in a Trapped Gas from Second-Order Hydrodynamics | Utilizing a second-order hydrodynamics formalism, the dispersion relations
for the frequencies and damping rates of collective oscillations as well as
spatial structure of these modes up to the decapole oscillation in both two-
and three- dimensional gas geometries are calculated. In addition to
higher-order modes, the... | 1610.01611v2 |
2016-12-06 | Increased low-temperature damping in yttrium iron garnet thin films | We report measurements of the frequency and temperature dependence of
ferromagnetic resonance (FMR) for a 15-nm-thick yttrium iron garnet (YIG) film
grown by off-axis sputtering. Although the FMR linewidth is narrow at room
temperature (corresponding to a damping coefficient $\alpha$ = (9.0 $\pm$ 0.2)
$\times 10^{-4}$)... | 1612.01954v1 |
2016-12-09 | Slow motion for one-dimensional nonlinear damped hyperbolic Allen-Cahn systems | We consider a nonlinear damped hyperbolic reaction-diffusion system in a
bounded interval of the real line with homogeneous Neumann boundary conditions
and we study the metastable dynamics of the solutions. Using an "energy
approach" introduced by Bronsard and Kohn [CPAM 1990] to study slow motion for
Allen-Cahn equati... | 1612.03203v5 |
2017-02-20 | Resonant Scattering Characteristics of Homogeneous Dielectric Sphere | In the present article the classical problem of electromagnetic scattering by
a single homogeneous sphere is revisited. Main focus is the study of the
scattering behavior as a function of the material contrast and the size
parameters for all electric and magnetic resonances of a dielectric sphere.
Specifically, the Pad... | 1702.05883v1 |
2017-03-21 | Numerical Range and Quadratic Numerical Range for Damped Systems | We prove new enclosures for the spectrum of non-selfadjoint operator matrices
associated with second order linear differential equations $\ddot{z}(t) + D
\dot{z} (t) + A_0 z(t) = 0$ in a Hilbert space. Our main tool is the quadratic
numerical range for which we establish the spectral inclusion property under
weak assum... | 1703.07447v1 |
2017-08-02 | Global existence of solutions for semi-linear wave equation with scale-invariant damping and mass in exponentially weighted spaces | In this paper we consider the following Cauchy problem for the semi-linear
wave equation with scale-invariant dissipation and mass and power
non-linearity: \begin{align}\label{CP abstract} \begin{cases} u_{tt}-\Delta
u+\dfrac{\mu_1}{1+t} u_t+\dfrac{\mu_2^2}{(1+t)^2}u=|u|^p, \\ u(0,x)=u_0(x),
\,\, u_t(0,x)=u_1(x), \end{... | 1708.00738v1 |
2017-11-11 | Quantum Thermodynamics for Driven Dissipative Bosonic Systems | We investigate two prototypical dissipative bosonic systems under slow
driving and arbitrary system-bath coupling strength, recovering their dynamic
evolution as well as the heat and work rates, and we verify that thermodynamic
laws are respected. Specifically, we look at the damped harmonic oscillator and
the damped t... | 1711.04077v1 |
2018-02-14 | Motion of interfaces for a damped hyperbolic Allen-Cahn equation | Consider the Allen-Cahn equation $u_t=\varepsilon^2\Delta u-F'(u)$, where $F$
is a double well potential with wells of equal depth, located at $\pm1$. There
are a lot of papers devoted to the study of the limiting behavior of the
solutions as the diffusion coefficient $\varepsilon\to0^+$, and it is well
known that, if ... | 1802.05038v1 |
2018-04-01 | Aggregated Momentum: Stability Through Passive Damping | Momentum is a simple and widely used trick which allows gradient-based
optimizers to pick up speed along low curvature directions. Its performance
depends crucially on a damping coefficient $\beta$. Large $\beta$ values can
potentially deliver much larger speedups, but are prone to oscillations and
instability; hence o... | 1804.00325v3 |
2018-09-27 | Non-equilibrium Quantum Langevin dynamics of orbital diamagnetic moment | We investigate the time dependent orbital diamagnetic moment of a charged
particle in a magnetic field in a viscous medium via the Quantum Langevin
Equation. We study how the interplay between the cyclotron frequency and the
viscous damping rate governs the dynamics of the orbital magnetic moment in the
high temperatur... | 1809.10370v1 |
2018-12-10 | Assessment of skin-friction-reduction techniques on a turbulent wing section | The scope of the present project is to quantify the effects of uniform
blowing and body-force damping on turbulent boundary layers subjected to a
non-uniform adverse-pressure-gradient distribution. To this end, well-resolved
large-eddy simulations are employed to describe the flow around the NACA4412
airfoil at moderat... | 1812.03762v1 |
2018-12-19 | Rain Calms the Sea - The Impact of Entrained Air | We propose a mechanism for the damping of short ocean gravity waves during
rainstorms associated with the injection of air bubbles by rain drops. The
mechanism is proposed as one of the possible explanations that ascribe to rain
a calming effect on ocean surface waves. A model is developed that shows how
wave attenuati... | 1812.08200v2 |
2019-01-10 | Stability and Controllability results for a Timoshenko system | In this paper, we study the indirect boundary stability and exact
controllability of a one-dimensional Timoshenko system. In the first part of
the paper, we consider the Timoshenko system with only one boundary fractional
damping. We first show that the system is strongly stable but not uniformly
stable. Hence, we look... | 1901.03303v2 |
2019-05-07 | Integral representation formulae for the solution of a wave equation with time-dependent damping and mass in the scale-invariant case | This paper is devoted to derive integral representation formulae for the
solution of an inhomogeneous linear wave equation with time-dependent damping
and mass terms, that are scale-invariant with respect to the so-called
hyperbolic scaling. Yagdjian's integral transform approach is employed for this
purpose. The main ... | 1905.02408v1 |
2019-05-20 | Short time blow-up by negative mass term for semilinear wave equations with small data and scattering damping | In this paper we study blow-up and lifespan estimate for solutions to the
Cauchy problem with small data for semilinear wave equations with scattering
damping and negative mass term. We show that the negative mass term will play a
dominant role when the decay of its coefficients is not so fast, thus the
solutions will ... | 1905.08100v1 |
2019-06-21 | Control of eigenfunctions on surfaces of variable curvature | We prove a microlocal lower bound on the mass of high energy eigenfunctions
of the Laplacian on compact surfaces of negative curvature, and more generally
on surfaces with Anosov geodesic flows. This implies controllability for the
Schr\"odinger equation by any nonempty open set, and shows that every
semiclassical meas... | 1906.08923v2 |
2019-09-19 | Blow-up for Strauss type wave equation with damping and potential | We study a kind of nonlinear wave equations with damping and potential, whose
coefficients are both critical in the sense of the scaling and depend only on
the spatial variables. Based on the earlier works, one may think there are two
kinds of blow-up phenomenons when the exponent of the nonlinear term is small.
It als... | 1909.08885v3 |
2019-12-10 | Stability of traveling waves in a driven Frenkel-Kontorova model | In this work we revisit a classical problem of traveling waves in a damped
Frenkel-Kontorova lattice driven by a constant external force. We compute these
solutions as fixed points of a nonlinear map and obtain the corresponding
kinetic relation between the driving force and the velocity of the wave for
different value... | 1912.05052v2 |
2020-06-10 | Interpolation between Residual and Non-Residual Networks | Although ordinary differential equations (ODEs) provide insights for
designing network architectures, its relationship with the non-residual
convolutional neural networks (CNNs) is still unclear. In this paper, we
present a novel ODE model by adding a damping term. It can be shown that the
proposed model can recover bo... | 2006.05749v4 |
2020-06-24 | The Complex Permeability of Split-Ring Resonator Arrays Measured at Microwave Frequencies | We have measured the relative permeability of split-ring resonator (SRR)
arrays used in metamaterials designed to have $\mu^\prime< 0$ over a narrow
range of microwave frequencies. The SRR arrays were loaded into the bore of a
loop-gap resonator (LGR) and reflection coefficient measurements were used to
determine both ... | 2006.13861v1 |
2020-12-28 | Reliability optimization of friction-damped systems using nonlinear modes | A novel probabilistic approach for the design of mechanical structures with
friction interfaces is proposed. The objective function is defined as the
probability that a specified performance measure of the forced vibration
response is achieved subject to parameter uncertainties. The practicability of
the approach regar... | 2012.14466v1 |
2021-01-25 | A modified Kačanov iteration scheme with application to quasilinear diffusion models | The classical Ka\v{c}anov scheme for the solution of nonlinear variational
problems can be interpreted as a fixed point iteration method that updates a
given approximation by solving a linear problem in each step. Based on this
observation, we introduce a modified Ka\v{c}anov method, which allows for
(adaptive) damping... | 2101.10137v3 |
2021-03-01 | Dynamics of a ring of three unidirectionally coupled Duffing oscillators with time-dependent damping | We study dynamics of a ring of three unidirectionally coupled double-well
Duffing oscillators for three different values of the damping coefficient:
fixed dumping, proportional to time, and inversely proportional to time. The
dynamics in all cases is analyzed through time series, Fourier and Hilbert
transforms, Poincar... | 2103.01297v1 |
2021-03-16 | On an inverse problem of nonlinear imaging with fractional damping | This paper considers the attenuated Westervelt equation in pressure
formulation. The attenuation is by various models proposed in the literature
and characterised by the inclusion of non-local operators that give power law
damping as opposed to the exponential of classical models. The goal is the
inverse problem of rec... | 2103.08965v1 |
2021-04-22 | Dissipation and fluctuations in elongated bosonic Josephson junctions | We investigate the dynamics of bosonic atoms in elongated Josephson
junctions. We find that these systems are characterized by an intrinsic
coupling between the Josephson mode of macroscopic quantum tunneling and the
sound modes. This coupling of Josephson and sound modes gives rise to a damped
and stochastic Langevin ... | 2104.11259v2 |
2022-04-07 | Pseudo Numerical Ranges and Spectral Enclosures | We introduce the new concepts of pseu\-do numerical range for operator
functions and families of sesquilinear forms as well as the pseu\-do block
numerical range for $n \times n$ operator matrix functions. While these notions
are new even in the bounded case, we cover operator polynomials with unbounded
coefficients, u... | 2204.03584v1 |
2022-04-14 | Stability of Exponentially Damped Oscillations under Perturbations of the Mori-Chain | There is an abundance of evidence that some relaxation dynamics, e.g.,
exponential decays, are much more common in nature than others. Recently, there
have been attempts to trace this dominance back to a certain stability of the
prevalent dynamics versus generic Hamiltonian perturbations. In the paper at
hand, we tackl... | 2204.06903v1 |
2022-05-09 | Mutual friction and diffusion of two-dimensional quantum vortices | We present a microscopic open quantum systems theory of thermally-damped
vortex motion in oblate atomic superfluids that includes previously neglected
energy-damping interactions between superfluid and thermal atoms. This
mechanism couples strongly to vortex core motion and causes dissipation of
vortex energy due to mu... | 2205.04065v2 |
2022-05-12 | Global existence and stability of subsonic time-periodic solution to the damped compressible Euler equations in a bounded domain | In this paper, we consider the one-dimensional isentropic compressible Euler
equations with source term $\beta(t,x)\rho|u|^{\alpha}u$ in a bounded domain,
which can be used to describe gas transmission in a nozzle.~The model is
imposed a subsonic time-periodic boundary condition.~Our main results reveal
that the time-p... | 2205.05858v2 |
2022-09-11 | Approximation of Algebraic Riccati Equations with Generators of Noncompact Semigroups | In this work, we demonstrate that the Bochner integral representation of the
Algebraic Riccati Equations (ARE) are well-posed without any compactness
assumptions on the coefficient and semigroup operators. From this result, we
then are able to determine that, under some assumptions, the solution to the
Galerkin approxi... | 2209.04769v5 |
2022-11-18 | Accelerated gradient methods with strong convergence to the minimum norm minimizer: a dynamic approach combining time scaling, averaging, and Tikhonov regularization | In a Hilbert framework, for convex differentiable optimization, we consider
accelerated gradient methods obtained by combining temporal scaling and
averaging techniques with Tikhonov regularization. We start from the continuous
steepest descent dynamic with an additional Tikhonov regularization term whose
coefficient v... | 2211.10140v1 |
2022-12-21 | Global existence and Blow-up for the 1D damped compressible Euler equations with time and space dependent perturbation | In this paper, we consider the 1D Euler equation with time and space
dependent damping term $-a(t,x)v$. It has long been known that when $a(t,x)$ is
a positive constant or $0$, the solution exists globally in time or blows up in
finite time, respectively. We prove that those results are invariant with
respect to time a... | 2212.11072v2 |
2023-07-19 | A spin-rotation mechanism of Einstein-de Haas effect based on a ferromagnetic disk | Spin-rotation coupling (SRC) is a fundamental phenomenon that connects
electronic spins with the rotational motion of a medium. We elucidate the
Einstein-de Haas (EdH) effect and its inverse with SRC as the microscopic
mechanism using the dynamic spin-lattice equations derived by elasticity theory
and Lagrangian formal... | 2307.10390v1 |
2023-08-05 | The isometric immersion of surfaces with finite total curvature | In this paper, we study the smooth isometric immersion of a complete simply
connected surface with a negative Gauss curvature in the three-dimensional
Euclidean space. For a surface with a finite total Gauss curvature and
appropriate oscillations of the Gauss curvature, we prove the global existence
of a smooth solutio... | 2308.02832v2 |
2023-08-30 | Stochastic Thermodynamics of Brownian motion in Temperature Gradient | We study stochastic thermodynamics of a Brownian particle which is subjected
to a temperature gradient and is confined by an external potential. We first
formulate an over-damped Ito-Langevin theory in terms of local temperature,
friction coefficient, and steady state distribution, all of which are
experimentally measu... | 2308.15764v3 |
2023-12-27 | Universal orbital and magnetic structures in infinite-layer nickelates | We conducted a comparative study of the rare-earth infinite-layer nickelates
films, RNiO2 (R = La, Pr, and Nd) using resonant inelastic X-ray scattering
(RIXS). We found that the gross features of the orbital configurations are
essentially the same, with minor variations in the detailed hybridization. For
low-energy ex... | 2312.16444v1 |
2005-07-28 | Transverse spin waves in isotropic ferromagnets | The comparison of transverse spin wave spectra and its attenuation in
Heisenberg ferromagnet and in ferromagnetic Fermi liquid as well in polarized
Fermi liquid is undertaken. The transverse spin waves frequency in polarized
paramagnetic Fermi liquid as well in a Fermi liquid with spontaneous
magnetization is found to ... | 0507676v1 |
1998-10-22 | Quantifying excitations of quasinormal mode systems | Computations of the strong field generation of gravitational waves by black
hole processes produce waveforms that are dominated by quasinormal (QN)
ringing, a damped oscillation characteristic of the black hole. We describe
here the mathematical problem of quantifying the QN content of the waveforms
generated. This is ... | 9810074v1 |
2007-04-09 | Bulk viscosity of superfluid neutron stars | The hydrodynamics, describing dynamical effects in superfluid neutron stars,
essentially differs from the standard one-fluid hydrodynamics. In particular,
we have four bulk viscosity coefficients in the theory instead of one. In this
paper we calculate these coefficients, for the first time, assuming they are
due to no... | 0704.1071v2 |
2008-07-28 | Enhancement of thermal transport in the degenerate periodic Anderson model | The low-temperature transport coefficients of the degenerate periodic SU(N)
Anderson model are calculated in the limit of infinite correlation between {\it
f} electrons, within the framework of dynamical mean-field theory. We establish
the Fermi liquid (FL) laws in the clean limit, taking into account the
quasiparticle... | 0807.4385v2 |
2012-06-09 | Non linearities in the harmonic spectrum of heavy ion collisions with ideal and viscous hydrodynamics | We determine the non-linear hydrodynamic response to geometrical fluctuations
in heavy ion collisions using ideal and viscous hydrodynamics. This response is
characterized with a set of non-linear response coefficients that determine,
for example, the $v_5$ that is produced by an $\epsilon_2$ and an $\epsilon_3$.
We an... | 1206.1905v2 |
2014-10-05 | Finite-time stabilization of a network of strings | We investigate the finite-time stabilization of a tree-shaped network of
strings. Transparent boundary conditions are applied at all the external nodes.
At any internal node, in addition to the usual continuity conditions, a
modified Kirchhoff law incorporating a damping term $\alpha u_t$ with a
coefficient $\alpha$ th... | 1410.1122v1 |
2014-11-03 | Experimental Demonstration of the Co-existence of the Spin Hall and Rashba Effects in beta-Tantalum/Ferromagnet Bilayers | We have measured the spin torques of beta-Tantalum / Co20Fe60B20 bilayers
versus Ta thickness at room temperature using an FMR technique. The spin Hall
coefficient was calculated both from the observed change in damping coefficient
of the ferromagnet with Ta thickness, and from the ratio of the symmetric and
anti-symme... | 1411.0601v1 |
2017-11-05 | An entropy production based method for determining the position diffusion's coefficient of a quantum Brownian motion | Quantum Brownian motion of a harmonic oscillator in the Markovian
approximation is described by the respective Caldeira-Leggett master equation.
This master equation can be brought into Lindblad form by adding a position
diffusion term to it. The coefficient of this term is either customarily taken
to be the lower boun... | 1711.01642v2 |
2019-03-25 | Bouncing behavior and dissipative characterization of a chain-filled granular damper | We have experimentally investigated the bouncing behavior and damping
performance of a container partially filled with granular chains, namely a
chain-filled damper. The motion of the chain-filled damper, recorded by a
particle tracing technology, demonstrates that the granular chains can
efficiently absorb the collisi... | 1903.10329v1 |
2020-02-06 | Measurement of resistance coefficients of pendulum motion with balls of various sizes | In order to obtain the damping and resistance coefficients of a pendulum, we
constructed an optical system containing a photogate for measuring the speed of
the pendulum at the lowest point of motion. The photogate consisted of a
photoresistor, a laser, a mechanical body, and a pendulum ball. A 3D printer
was used to p... | 2002.03796v1 |
2022-01-25 | Kinetics of hydrodynamic pions in chiral perturbation theory | We determine the kinetic coefficients of ultrasoft pions using chiral
perturbation theory at finite temperature close to the chiral limit. This is
used to compute the axial charge diffusion and damping coefficients in the
hydrodynamic effective theory for these pion waves. We show that to provide a
leading order answer... | 2201.10495v2 |
2022-09-21 | Cross effects in spin hydrodynamics: A revisit Entropy analysis and statistical operator | We revisit the construction of first-order spin hydrodynamics and find that
the constitution relations receive the corrections from the cross effects
resulting from spin-orbit coupling. Starting from a routine entropy analysis,
we show how to identify cross effects and new cross transport coefficients from
the second l... | 2209.10979v2 |
2024-02-14 | Global existence and long time behavior of solutions to some Oldroyd type models in hybrid Besov spaces | In this paper, we deal with some Oldroyd type models, which describe
incompressible viscoelastic fluids. There are 3 parameters in these models: the
viscous coefficient of fluid $\nu_{1}$, the viscous coefficient of the elastic
part of the stress tensor $\nu_{2}$, and the damping coefficient of the elastic
part of the ... | 2402.09175v1 |
2012-06-14 | On the Interpretation of the Foundations of Quantum Mechanics | This study discusses the quantum behavior of a particle, which is controlled
by fluctuations in the physical space-time (ST) variables, rather than provides
a novel interpretation of quantum theory. The fluctuations, i.e.,
inhomogeneities in a homogeneous phase ST, are prescribed by their probability.
They determine th... | 1206.2998v1 |
2019-11-15 | A geometric look at MHD and the Braginsky dynamo | This paper considers magnetohydrodynamics (MHD) and some of its applications
from the perspective of differential geometry, considering the dynamics of an
ideal fluid flow and magnetic field on a general three-dimensional manifold,
equipped with a metric and an induced volume form. The benefit of this level of
abstract... | 1911.06592v2 |
2020-09-18 | Information- and Coding-Theoretic Analysis of the RLWE Channel | Several cryptosystems based on the \emph{Ring Learning with Errors} (RLWE)
problem have been proposed within the NIST post-quantum cryptography
standardization process, e.g., NewHope. Furthermore, there are systems like
Kyber which are based on the closely related MLWE assumption. Both previously
mentioned schemes resu... | 2009.08681v3 |
2021-05-18 | Magnetic flux structuring of the quiet Sun internetwork. Center-to-limb analysis of solar-cycle variations | It is now well established that the quiet Sun contains in total more magnetic
flux than active regions and represents an important reservoir of magnetic
energy. But the nature and evolution of these fields remain largely unknown.
We investigate the solar-cycle and center-to-limb variations of magnetic-flux
structures... | 2105.08657v1 |
2021-07-24 | Dual-Attention Enhanced BDense-UNet for Liver Lesion Segmentation | In this work, we propose a new segmentation network by integrating DenseUNet
and bidirectional LSTM together with attention mechanism, termed as
DA-BDense-UNet. DenseUNet allows learning enough diverse features and enhancing
the representative power of networks by regulating the information flow.
Bidirectional LSTM is ... | 2107.11645v1 |
2023-12-03 | Heisenberg machines with programmable spin-circuits | We show that we can harness two recent experimental developments to build a
compact hardware emulator for the classical Heisenberg model in statistical
physics. The first is the demonstration of spin-diffusion lengths in excess of
microns in graphene even at room temperature. The second is the demonstration
of low barr... | 2312.01477v1 |
2024-02-19 | Density estimation for elliptic PDE with random input by preintegration and quasi-Monte Carlo methods | In this paper, we apply quasi-Monte Carlo (QMC) methods with an initial
preintegration step to estimate cumulative distribution functions and
probability density functions in uncertainty quantification (UQ). The
distribution and density functions correspond to a quantity of interest
involving the solution to an ellipti... | 2402.11807v1 |
2004-11-02 | Spurious contribution to CR scattering calculations | The quasilinear theory for cosmic ray propagation is a well known and widely
accepted theory. In this paper, we discuss the different contributions to the
pitch-angle Fokker-Planck coefficient from large and small scales for slab
geometry using the damping model of dynamical turbulence. These examinations
will give us ... | 0411074v1 |
2006-01-16 | Bistability in Interstellar Gas-Phase Chemistry | We present an analysis of "bistability" in gas-phase chemical models of dark
interstellar clouds. We identify the chemical mechanisms that allow high- and
low-ionization solutions to the chemical rate-equations to coexist. We derive
simple analytic scaling relations for the gas densities and ionization rates
for which ... | 0601323v1 |
1995-03-17 | Motion of heavy particles coupled to fermionic and bosonic environments in one dimension | Making use of a simple unitary transformation we change the hamiltonian of a
particle coupled to an one dimensional gas of bosons or fermions to a new form
from which the many body degrees of freedom can be easily traced out. The
effective dynamics of the particle allows us to compute its damping constant in
terms of t... | 9503089v2 |
1997-06-06 | Dynamics of viscous amphiphilic films supported by elastic solid substrates | The dynamics of amphiphilic films deposited on a solid surface is analyzed
for the case when shear oscillations of the solid surface are excited. The two
cases of surface- and bulk shear waves are studied with film exposed to gas or
to a liquid. By solving the corresponding dispersion equation and the wave
equation whi... | 9706058v1 |
1997-09-30 | AC transport with reservoirs of finite width | The linear response conductance coefficients are calculated in the scattering
approach at finite frequency, damping and magnetic field for a microstructure
in which the reservoirs are modeled as quantum wire leads of infinite length
but finite width. Independently of frequency, inelastic scattering causes
subbands with... | 9709332v2 |
1999-12-08 | Thermodynamical fluctuations and photo-thermal shot noise in gravitational wave antennae | Thermodynamical fluctuations of temperature in mirrors of gravitational wave
antennae are transformed through thermal expansion coefficient into additional
noise. This source of noise, which may also be interpreted as fluctuations due
to thermoelastic damping, may not be neglected and leads to the necessity to
reexamin... | 9912139v1 |
2001-02-26 | Relaxation time of weakly interacting superparamagnets | The relaxation time of weakly interacting classical spins is calculated by
introducing the averages of the local dipolar field, obtained by thermodynamic
perturbation theory, in a rigorous expression for the single-spin
thermoactivation rate in a weak but arbitrarily oriented field. At low
temperatures the non-trivial ... | 0102472v1 |
2001-08-11 | Spin dynamics from time-dependent spin density-functional theory | We derive the spin-wave dynamics of a magnetic material from the
time-dependent spin density functional theory in the linear response regime.
The equation of motion for the magnetization includes, besides the static spin
stiffness, a "Berry curvature" correction and a damping term. A gradient
expansion scheme based on ... | 0108193v1 |
2006-02-01 | Special frequencies in reflection spectra of Bragg multiple quantum well structures | We have studied theoretically optical reflection spectra from the Bragg
multiple quantum well structures. We give an analytical explanation of the
presence of two special frequencies in the spectra at which the reflection
coefficient weakly depends on the quantum well number. The influence of the
exciton nonradiative d... | 0602013v1 |
2007-02-05 | Diffusion in Modulated Media | We study the motion of Brownian particle in modulated media in the strong
damping limit by using {\em toy model}, with special emphasis on the transition
from localise to diffusive behavior. By using model potential we have seen the
localised behavior when the number of minima of the potential is finite in the
asymptot... | 0702092v1 |
2004-09-10 | A Nonlinear Coupling Network to Simulate the Development of the r-mode Instablility in Neutron Stars I. Construction | R-modes of a rotating neutron star are unstable because of the emission of
gravitational radiation. We explore the saturation amplitudes of these modes
determined by nonlinear mode-mode coupling. Modelling the star as
incompressible allows the analytic computation of the coupling coefficients.
All couplings up to n=30 ... | 0409048v1 |
1996-03-25 | Fermion Scattering at a Phase Wave | We study fermion reflection at a phase wave which is formed during a bubble
collision in a first order phase transition. We calculate the reflection and
the transmission coefficients by solving the Dirac equation with the phase wave
background. Using the results we analyze the damping and the velocity of the
wave. | 9603401v2 |
2003-06-01 | Asymptotic Quasinormal Frequencies of d-dimensional Schwarzschild Black Holes | We determine the quasinormal frequencies for all gravitational perturbations
of the d-dimensional Schwarzschild black hole, in the infinite damping limit.
Using the potentials for gravitational perturbations derived recently by
Ishibashi and Kodama, we show that in all cases the asymptotic real part of the
frequency is... | 0306004v2 |
2002-03-05 | Broken symmetries and pattern formation in two-frequency forced Faraday waves | We exploit the presence of approximate (broken) symmetries to obtain general
scaling laws governing the process of pattern formation in weakly damped
Faraday waves. Specifically, we consider a two-frequency forcing function and
trace the effects of time translation, time reversal and Hamiltonian structure
for three ill... | 0203004v1 |
1997-02-12 | A self-consistent treatment of the dynamics of stable and unstable collective modes | We address the dynamics of damped collective modes in terms of first and
second moments. The modes are introduced in a self-consistent fashion with the
help of a suitable application of linear response theory. Quantum effects in
the fluctuations are governed by diffusion coefficients D_{\mu\nu}. The latter
are obtained... | 9702029v1 |
2005-01-07 | Velocity-Space Diffusion in a Perpendicularly Propagating Electrostatic Wave | The motion of ions in the fields B = B_0 zhat and E = E_0 yhat cos(k_perp y -
omega t) is considered. When omega >> Omega_i and v_perp > omega/k_perp, the
equations of motion may be reduced to a set of difference equations. These
equations exhibit stochastic behavior when E_0 exceeds a threshold. The
diffusion coeffici... | 0501035v1 |
2002-05-20 | Selection of Squeezed States via Decoherence | In the framework of Lindblad theory for open quantum systems, we calculate
the entropy of a damped quantum harmonic oscillator which is initially in a
quasi-free state. The maximally predictable states are identified as those
states producing the minimum entropy increase after a long enough time. In
general, the states... | 0205127v1 |
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