publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2006-12-01 | Gilbert damping and spin Coulomb drag in a magnetized electron liquid with spin-orbit interaction | We present a microscopic calculation of the Gilbert damping constant for the
magnetization of a two-dimensional spin-polarized electron liquid in the
presence of intrinsic spin-orbit interaction. First we show that the Gilbert
constant can be expressed in terms of the auto-correlation function of the
spin-orbit induced... | 0612015v1 |
2000-03-29 | Disagreement between correlations of quantum mechanics and stochastic electrodynamics in the damped parametric oscillator | Intracavity and external third order correlations in the damped nondegenerate
parametric oscillator are calculated for quantum mechanics and stochastic
electrodynamics (SED), a semiclassical theory. The two theories yield greatly
different results, with the correlations of quantum mechanics being cubic in
the system's ... | 0003131v1 |
2012-12-18 | Using the mobile phone acceleration sensor in Physics experiments: free and damped harmonic oscillations | The mobile acceleration sensor has been used to in Physics experiments on
free and damped oscillations. Results for the period, frequency, spring
constant and damping constant match very well to measurements obtained by other
methods. The Accelerometer Monitor application for Android has been used to get
the outputs of... | 1212.4403v1 |
2014-03-19 | The effects of time-dependent dissipation on the basins of attraction for the pendulum with oscillating support | We consider a pendulum with vertically oscillating support and time-dependent
damping coefficient which varies until reaching a finite final value. The sizes
of the corresponding basins of attraction are found to depend strongly on the
full evolution of the dissipation. In order to predict the behaviour of the
system, ... | 1403.4996v1 |
1995-09-06 | Fermi Liquid Damping and NMR Relaxation in Superconductors | Electron collisions for a two dimensional Fermi liquid (FL) are shown to give
a quasiparticle damping with interesting frequency and temperature variations
in the BCS superconducting state. The spin susceptibility which determines the
structure of the damping is analyzed in the normal state for a Hubbard model
with a c... | 9509028v1 |
2002-07-26 | Landau damping of partially incoherent Langmuir waves | It is shown that partial incoherence, in the form of stochastic phase noise,
of a Langmuir wave in an unmagnetized plasma gives rise to a Landau-type
damping. Starting from the Zakharov equations, which describe the nonlinear
interaction between Langmuir and ion-acoustic waves, a kinetic equation is
derived for the pla... | 0207050v1 |
2017-07-30 | Blow-up for semilinear damped wave equations with sub-Strauss exponent in the scattering case | It is well-known that the critical exponent for semilinear damped wave
equations is Fujita exponent when the damping is effective. Lai, Takamura and
Wakasa in 2017 have obtained a blow-up result not only for super-Fujita
exponent but also for the one closely related to Strauss exponent when the
damping is scaling invar... | 1707.09583v3 |
2018-06-13 | Low magnetic damping of ferrimagnetic GdFeCo alloys | We investigate the Gilbert damping parameter for rare earth (RE)-transition
metal (TM) ferrimagnets over a wide temperature range. Extracted from the
field-driven magnetic domain-wall mobility, the Gilbert damping parameter was
as low as 0.0072 and was almost constant across the angular momentum
compensation temperatur... | 1806.04881v1 |
2020-05-15 | Slow magnetosonic wave absorption by pressure induced ionization-recombination dissipation | A new mechanisms for damping of slow magnetosonic waves (SMW) by pressure
induced oscillations of the ionization degree is proposed. An explicit formula
for the damping rate is quantitatively derived. Physical conditions where the
new mechanism will dominate are briefly discussed. The ionization-recombination
damping i... | 2005.07730v1 |
2016-12-30 | Spectroscopic evidence of Alfvén wave damping in the off-limb solar corona | We investigate off-limb active region and quiet Sun corona using
spectroscopic data. Active region is clearly visible in several spectral lines
formed in the temperature range of 1.1--2.8 MK. We derive electron number
density using line ratio method, and non-thermal velocity in the off-limb
region up to the distance of... | 1612.09551v2 |
1997-06-30 | Damped Lyman Alpha Systems at High Redshift and Models of Protogalactic Disks | We employ observationally determined intrinsic velocity widths and column
densities of damped Lyman-alpha systems at high redshift to investigate the
distribution of baryons in protogalaxies within the context of a standard cold
dark matter model. We proceed under the assumption that damped Lyman alpha
systems represen... | 9706290v1 |
2019-01-24 | Generalization of Stokes-Einstein relation to coordinate dependent damping and diffusivity: An apparent conflict | Brownian motion with coordinate dependent damping and diffusivity is
ubiquitous. Understanding equilibrium of a Brownian particle with coordinate
dependent diffusion and damping is a contentious area. In this paper, we
present an alternative approach based on already established methods to this
problem. We solve for th... | 1901.08358v4 |
1996-11-25 | Damping rates of hard momentum particles in a cold ultrarelativistic plasma | We compute the damping rates of one-particle excitations in a cold
ultrarelativistic plasma to leading order in the coupling constant e for three
types of interaction: Yukawa coupling to a massless scalar boson, QED and QCD.
Damping rates of charged particles in QED and QCD are of order e^3 mu, while
damping rates of o... | 9611415v2 |
2011-06-23 | Ratchet effect on a relativistic particle driven by external forces | We study the ratchet effect of a damped relativistic particle driven by both
asymmetric temporal bi-harmonic and time-periodic piecewise constant forces.
This system can be formally solved for any external force, providing the
ratchet velocity as a non-linear functional of the driving force. This allows
us to explicitl... | 1106.4861v1 |
2012-10-20 | Radiative damping of surface plasmon resonance in spheroidal metallic nanoparticle embedded in a dielectric medium | The local field approach and kinetic equation method is applied to calculate
the surface plasmon radiative damping in a spheroidal metal nanoparticle
embedded in any dielectric media. The radiative damping of the surface plasmon
resonance as a function of the particle radius, shape, dielectric constant of
the surroundi... | 1210.5647v1 |
2015-11-13 | Magnified Damping under Rashba Spin Orbit Coupling | The spin orbit coupling spin torque consists of the field-like [REF: S.G. Tan
et al., arXiv:0705.3502, (2007).] and the damping-like terms [REF: H.
Kurebayashi et al., Nature Nanotechnology 9, 211 (2014).] that have been widely
studied for applications in magnetic memory. We focus, in this article, not on
the spin orbi... | 1511.04227v1 |
2022-05-13 | Precession dynamics of a small magnet with non-Markovian damping: Theoretical proposal for an experiment to determine the correlation time | Recent advances in experimental techniques have made it possible to
manipulate and measure the magnetization dynamics on the femtosecond time scale
which is the same order as the correlation time of the bath degrees of freedom.
In the equations of motion of magnetization, the correlation of the bath is
represented by t... | 2205.06399v1 |
2006-01-18 | Expressions for frictional and conservative force combinations within the dissipative Lagrange-Hamilton formalism | Dissipative Lagrangians and Hamiltonians having Coulomb, viscous and
quadratic damping,together with gravitational and elastic terms are presented
for a formalism that preserves the Hamiltonian as a constant of the motion.
Their derivations are also shown. The resulting L's and H's may prove useful in
exploring new typ... | 0601133v1 |
2010-03-28 | Damped wave dynamics for a complex Ginzburg-Landau equation with low dissipation | We consider a complex Ginzburg-Landau equation, corresponding to a
Gross-Pitaevskii equation with a small dissipation term. We study an asymptotic
regime for long-wave perturbations of constant maps of modulus one. We show
that such solutions never vanish and we derive a damped wave dynamics for the
perturbation. | 1003.5375v1 |
2011-11-20 | Null controllability of the structurally damped wave equation with moving point control | We investigate the internal controllability of the wave equation with
structural damping on the one dimensional torus. We assume that the control is
acting on a moving point or on a moving small interval with a constant
velocity. We prove that the null controllability holds in some suitable Sobolev
space and after a fi... | 1111.4655v1 |
2013-09-19 | Compressible Euler equation with damping on Torus in arbitrary dimensions | We study the exponential stability of constant steady state of isentropic
compressible Euler equation with damping on $\mathbb T^n$. The local existence
of solutions is based on semigroup theory and some commutator estimates. We
propose a new method instead of energy estimates to study the stability, which
works equall... | 1309.5059v3 |
2018-09-26 | Permutation-invariant constant-excitation quantum codes for amplitude damping | The increasing interest in using quantum error correcting codes in practical
devices has heightened the need for designing quantum error correcting codes
that can correct against specialized errors, such as that of amplitude damping
errors which model photon loss. Although considerable research has been devoted
to quan... | 1809.09801v4 |
2019-10-24 | Spin waves in ferromagnetic thin films | A spin wave is the disturbance of intrinsic spin order in magnetic materials.
In this paper, a spin wave in the Landau-Lifshitz-Gilbert equation is obtained
based on the assumption that the spin wave maintains its shape while it
propagates at a constant velocity. Our main findings include: (1) in the
absence of Gilbert... | 1910.11200v1 |
2019-11-07 | Quantum Oscillations of Gilbert Damping in Ferromagnetic/Graphene Bilayer Systems | We study the spin dynamics of a ferromagnetic insulator on which graphene is
placed. We show that the Gilbert damping is enhanced by the proximity exchange
coupling at the interface. The modulation of the Gilbert damping constant is
proportional to the product of the spin-up and spin-down densities of states of
graphen... | 1911.02775v2 |
1992-04-06 | Comment on ``High Temperature Fermion Propagator -- Resummation and Gauge Dependence of the Damping Rate'' | Baier et al. have reported the damping rate of long-wavelength fermionic
excitations in high-temperature QED and QCD to be gauge-fixing-dependent even
within the resummation scheme due to Braaten and Pisarski. It is shown that
this problem is caused by the singular nature of the on-shell expansion of the
fermion self-e... | 9204210v1 |
2003-07-02 | Harmonic Oscillator Potential to describe Internal Dissipation | Assuming that a constant potential energy function has meaning for a
dissipated harmonic oscillator, then an important issue is the time dependence
of the turning points. Turning point studies demonstrate that the common model
of external (viscous) damping fails to properly describe those many systems
where structural ... | 0307016v1 |
2009-12-16 | Toward a dynamical shift condition for unequal mass black hole binary simulations | Moving puncture simulations of black hole binaries rely on a specific gauge
choice that leads to approximately stationary coordinates near each black hole.
Part of the shift condition is a damping parameter, which has to be properly
chosen for stable evolutions. However, a constant damping parameter does not
account fo... | 0912.3125v1 |
2010-03-09 | Damping of Nanomechanical Resonators | We study the transverse oscillatory modes of nanomechanical silicon nitride
strings under high tensile stress as a function of geometry and mode index m <=
9. Reproducing all observed resonance frequencies with classical elastic theory
we extract the relevant elastic constants. Based on the oscillatory local
strain we ... | 1003.1868v1 |
2011-05-20 | Magnetization Dissipation in the Ferromagnetic Semiconductor (Ga,Mn)As | We compute the Gilbert damping in (Ga,Mn)As based on the scattering theory of
magnetization relaxation. The disorder scattering is included
non-perturbatively. In the clean limit, the spin-pumping from the localized
d-electrons to the itinerant holes dominates the relaxation processes. In the
diffusive regime, the brea... | 1105.4148v2 |
2011-10-12 | Acceleration Control in Nonlinear Vibrating Systems based on Damped Least Squares | A discrete time control algorithm using the damped least squares is
introduced for acceleration and energy exchange controls in nonlinear vibrating
systems. It is shown that the damping constant of least squares and sampling
time step of the controller must be inversely related to insure that vanishing
the time step ha... | 1110.2811v2 |
2012-03-21 | Approximate rogue wave solutions of the forced and damped Nonlinear Schrödinger equation for water waves | We consider the effect of the wind and the dissipation on the nonlinear
stages of the modulational instability. By applying a suitable transformation,
we map the forced/damped Nonlinear Schr\"odinger (NLS) equation into the
standard NLS with constant coefficients. The transformation is valid as long as
|{\Gamma}t| \ll ... | 1203.4735v1 |
2014-10-05 | Ultimate limit of field confinement by surface plasmon polaritons | We show that electric field confinement in surface plasmon polaritons
propagating at the metal/dielectric interfaces enhances the loss due to Landau
damping and which effectively limits the degree of confinement itself. We prove
that Landau damping and associated with it surface collision damping follow
directly from L... | 1410.1226v1 |
2016-04-18 | Parameter Estimation of Gaussian-Damped Sinusoids from a Geometric Perspective | The five parameter gaussian damped sinusoid equation is a reasonable model
for betatron motion with chromatic decoherence of the proton bunch centroid
signal in the ring at the Spallation Neutron Source. A geometric method for
efficiently fitting this equation to the turn by turn signals to extract the
betatron tune an... | 1604.05167v1 |
2016-07-13 | Optimal decay rate for the wave equation on a square with constant damping on a strip | We consider the damped wave equation with Dirichlet boundary conditions on
the unit square. We assume the damping to be a characteristic function of a
strip. We prove the exact $t^{-4/3}$-decay rate for the energy of classical
solutions. This answers a question of Anantharaman and L\'eautaud (2014). | 1607.03633v2 |
2016-09-20 | Global existence and asymptotic behavior of solutions to the Euler equations with time-dependent damping | We study the isentropic Euler equations with time-dependent damping, given by
$\frac{\mu}{(1+t)^\lambda}\rho u$. Here, $\lambda,\mu$ are two non-negative
constants to describe the decay rate of damping with respect to time. We will
investigate the global existence and asymptotic behavior of small data
solutions to the ... | 1609.06286v1 |
2017-09-24 | Suppression of Recurrence in the Hermite-Spectral Method for Transport Equations | We study the unphysical recurrence phenomenon arising in the numerical
simulation of the transport equations using Hermite-spectral method. From a
mathematical point of view, the suppression of this numerical artifact with
filters is theoretically analyzed for two types of transport equations. It is
rigorously proven t... | 1709.08194v1 |
2018-05-03 | Exact Intrinsic Localized Excitation of an Anisotropic Ferromagnetic Spin Chain in External Magnetic Field with Gilbert Damping, Spin Current and PT-Symmetry | We obtain the exact one-spin intrinsic localized excitation in an anisotropic
Heisenberg ferromagnetic spin chain in a constant/variable external magnetic
field with Gilbert damping included. We also point out how an appropriate
magnitude spin current term in a spin transfer nano-oscillator (STNO) can
stabilize the ten... | 1805.01230v1 |
2018-06-08 | Brownian motion of magnetic domain walls and skyrmions, and their diffusion constants | Extended numerical simulations enable to ascertain the diffusive behavior at
finite temperatures of chiral walls and skyrmions in ultra-thin model Co layers
exhibiting symmetric - Heisenberg - as well as antisymmetric -
Dzyaloshinskii-Moriya - exchange interactions. The Brownian motion of walls and
skyrmions is shown t... | 1806.03172v1 |
2009-04-21 | Tensor damping in metallic magnetic multilayers | The mechanism of spin-pumping, described by Tserkovnyak et al., is formally
analyzed in the general case of a magnetic multilayer consisting of two or more
metallic ferromagnetic (FM) films separated by normal metal (NM) layers. It is
shown that the spin-pumping-induced dynamic coupling between FM layers modifies
the l... | 0904.3150v2 |
2018-04-20 | A Weakly Nonlinear Model for the Damping of Resonantly Forced Density Waves in Dense Planetary Rings | In this paper we address the stability of resonantly forced density waves in
dense planetary rings.
Already by Goldreich & Tremaine (1978) it has been argued that density waves
might be unstable, depending on the relationship between the ring's viscosity
and the surface mass density.
In the recent paper Schmidt et ... | 1804.07674v1 |
2019-03-02 | Complex Stiffness Model of Physical Human-Robot Interaction: Implications for Control of Performance Augmentation Exoskeletons | Human joint dynamic stiffness plays an important role in the stability of
performance augmentation exoskeletons. In this paper, we consider a new
frequency domain model of the human joint dynamics which features a complex
value stiffness. This complex stiffness consists of a real stiffness and a
hysteretic damping. We ... | 1903.00704v4 |
2023-12-20 | An effective field theory of damped ferromagnetic systems | Using the in-in formalism, we generalize the recently constructed
magnetoelastic EFT arXiv:2112.13873 [hep-th] to describe the damping dynamics
of ferromagnetic systems at long wavelengths. We find that the standard Gilbert
damping term naturally arises as the simplest leading-order symmetry-consistent
non-conservative... | 2312.13093v1 |
2003-10-18 | Experiment and Dynamic Simulations of Radiation Damping of Laser-polarized liquid 129Xe at low magnetic field in a flow system | Radiation damping is generally observed when the sample with high spin
concentration and high gyro-magnetic ratio is placed in a high magnetic field.
However, we firstly observed liquid state 129Xe radiation damping using
laser-enhanced nuclear polarization at low magnetic field in a flow system in
which the polarizati... | 0310435v1 |
2009-08-04 | Time domain detection of pulsed spin torque damping reduction | Combining multiple ultrafast spin torque impulses with a 5 nanosecond
duration pulse for damping reduction, we observe time-domain precession which
evolves from an initial 1 ns duration transient with changing precessional
amplitude to constant amplitude oscillations persisting for over 2 ns. These
results are consiste... | 0908.0481v1 |
2014-08-15 | Linear hyperbolic equations with time-dependent propagation speed and strong damping | We consider a second order linear equation with a time-dependent coefficient
c(t) in front of the "elastic" operator. For these equations it is well-known
that a higher space-regularity of initial data compensates a lower
time-regularity of c(t).
In this paper we investigate the influence of a strong dissipation, nam... | 1408.3499v1 |
2017-01-12 | Blow-up for semilinear wave equations with the scale invariant damping and super-Fujita exponent | The blow-up for semilinear wave equations with the scale invariant damping
has been well-studied for sub-Fujita exponent. However, for super-Fujita
exponent, there is only one blow-up result which is obtained in 2014 by
Wakasugi in the case of non-effective damping. In this paper we extend his
result in two aspects by ... | 1701.03232v3 |
2018-11-29 | The Lugiato-Lefever equation with nonlinear damping caused by two photon absorption | In this paper we investigate the effect of nonlinear damping on the
Lugiato-Lefever equation $$ \i \partial_t a = -(\i-\zeta) a - da_{xx}
-(1+\i\kappa)|a|^2a +\i f $$ on the torus or the real line. For the case of the
torus it is shown that for small nonlinear damping $\kappa>0$ stationary
spatially periodic solutions ... | 1811.12200v3 |
2020-07-16 | Linearized wave-damping structure of Vlasov-Poisson in $\mathbb R^3$ | In this paper we study the linearized Vlasov-Poisson equation for localized
disturbances of an infinite, homogeneous Maxwellian background distribution in
$\mathbb R^3_x \times \mathbb R^3_v$. In contrast with the confined case
$\mathbb T^d _x \times \mathbb R_v ^d$, or the unconfined case $\mathbb R^d_x
\times \mathbb... | 2007.08580v1 |
2020-11-16 | Technology to Counter Online Flaming Based on the Frequency-Dependent Damping Coefficient in the Oscillation Model | Online social networks, which are remarkably active, often experience
explosive user dynamics such as online flaming, which can significantly impact
the real world. However, countermeasures based on social analyses of the
individuals causing flaming are too slow to be effective because of the
rapidity with which the in... | 2011.08117v1 |
2021-05-08 | A second-order numerical method for Landau-Lifshitz-Gilbert equation with large damping parameters | A second order accurate numerical scheme is proposed and implemented for the
Landau-Lifshitz-Gilbert equation, which models magnetization dynamics in
ferromagnetic materials, with large damping parameters. The main advantages of
this method are associated with the following features: (1) It only solves
linear systems o... | 2105.03576v1 |
2024-02-09 | Damping of density oscillations from bulk viscosity in quark matter | We study the damping of density oscillations in the quark matter phase that
might occur in compact stars. To this end we compute the bulk viscosity and the
associated damping time in three-flavor quark matter, considering both
nonleptonic and semileptonic electroweak processes. We use two different
equations of state o... | 2402.06595v1 |
2019-12-09 | Analytical solution of linearized equations of the Morris-Lecar neuron model at large constant stimulation | The classical biophysical Morris-Lecar model of neuronal excitability
predicts that upon stimulation of the neuron with a sufficiently large constant
depolarizing current there exists a finite interval of the current values where
periodic spike generation occurs. Above the upper boundary of this interval,
there is four... | 1912.04083v4 |
2003-10-13 | Domain wall mobility in nanowires: transverse versus vortex walls | The motion of domain walls in ferromagnetic, cylindrical nanowires is
investigated numerically by solving the Landau-Lifshitz-Gilbert equation for a
classical spin model in which energy contributions from exchange, crystalline
anisotropy, dipole-dipole interaction, and a driving magnetic field are
considered. Depending... | 0310277v1 |
2011-03-08 | Application of Explicit Symplectic Algorithms to Integration of Damping Oscillators | In this paper an approach is outlined. With this approach some explicit
algorithms can be applied to solve the initial value problem of $n-$dimensional
damped oscillators. This approach is based upon following structure: for any
non-conservative classical mechanical system and arbitrary initial conditions,
there exists... | 1103.1455v1 |
2014-05-12 | Global Existence and Nonlinear Diffusion of Classical Solutions to Non-Isentropic Euler Equations with Damping in Bounded Domain | We considered classical solutions to the initial boundary value problem for
non-isentropic compressible Euler equations with damping in multi-dimensions.
We obtained global a priori estimates and global existence results of classical
solutions to both non-isentropic Euler equations with damping and their
nonlinear diff... | 1405.2842v3 |
2019-10-24 | The lifespan of solutions of semilinear wave equations with the scale-invariant damping in two space dimensions | In this paper, we study the initial value problem for semilinear wave
equations with the time-dependent and scale-invariant damping in two
dimensions. Similarly to the one dimensional case by Kato, Takamura and Wakasa
in 2019, we obtain the lifespan estimates of the solution for a special
constant in the damping term, ... | 1910.11692v2 |
2020-08-06 | Quantum sensing of open systems: Estimation of damping constants and temperature | We determine quantum precision limits for estimation of damping constants and
temperature of lossy bosonic channels. A direct application would be the use of
light for estimation of the absorption and the temperature of a transparent
slab. Analytic lower bounds are obtained for the uncertainty in the estimation,
throug... | 2008.02728v1 |
2020-11-15 | A Random Matrix Theory Approach to Damping in Deep Learning | We conjecture that the inherent difference in generalisation between adaptive
and non-adaptive gradient methods in deep learning stems from the increased
estimation noise in the flattest directions of the true loss surface. We
demonstrate that typical schedules used for adaptive methods (with low
numerical stability or... | 2011.08181v5 |
2021-06-07 | Voltage-control of damping constant in magnetic-insulator/topological-insulator bilayers | The magnetic damping constant is a critical parameter for magnetization
dynamics and the efficiency of memory devices and magnon transport. Therefore,
its manipulation by electric fields is crucial in spintronics. Here, we
theoretically demonstrate the voltage-control of magnetic damping in ferro- and
ferrimagnetic-ins... | 2106.03332v1 |
2023-01-22 | Boundary stabilization of a vibrating string with variable length | We study small vibrations of a string with time-dependent length $\ell(t)$
and boundary damping. The vibrations are described by a 1-d wave equation in an
interval with one moving endpoint at a speed $\ell'(t)$ slower than the speed
of propagation of the wave c=1. With no damping, the energy of the solution
decays if t... | 2301.09086v1 |
2008-07-23 | Damped driven coupled oscillators: entanglement, decoherence and the classical limit | The interaction of (two-level) Rydberg atoms with dissipative QED cavity
fields can be described classically or quantum mechanically, even for very low
temperatures and mean number of photons, provided the damping constant is large
enough. We investigate the quantum-classical border, the entanglement and
decoherence of... | 0807.3715v1 |
1999-08-26 | Oscillator Strengths and Damping Constants for Atomic Lines in the J and H Bands | We have built a line list in the near-infrared J and H bands (1.00-1.34,
1.49-1.80 um) by gathering a series of laboratory and computed line lists.
Oscillator strengths and damping constants were computed or obtained by fitting
the solar spectrum.
The line list presented in this paper is, to our knowledge, the most c... | 9908296v1 |
1998-07-02 | Linear systems with adiabatic fluctuations | We consider a dynamical system subjected to weak but adiabatically slow
fluctuations of external origin. Based on the ``adiabatic following''
approximation we carry out an expansion in \alpha/|\mu|, where \alpha is the
strength of fluctuations and 1/|\mu| refers to the time scale of evolution of
the unperturbed system ... | 9807031v1 |
2004-09-15 | Rippled Cosmological Dark Matter from Damped Oscillating Newton Constant | Let the reciprocal Newton 'constant' be an apparently non-dynamical
Brans-Dicke scalar field damped oscillating towards its General Relativistic
VEV. We show, without introducing additional matter fields or dust, that the
corresponding cosmological evolution averagely resembles, in the Jordan frame,
the familiar dark r... | 0409059v2 |
2009-08-31 | Rigorous Theory of Optical Trapping by an Optical Vortex Beam | We propose a rigorous theory for the optical trapping by optical vortices,
which is emerging as an important tool to trap mesoscopic particles. The common
perception is that the trapping is solely due to the gradient force, and may be
characterized by three real force constants. However, we show that the optical
vortex... | 0908.4504v1 |
2009-10-24 | Two bodies gravitational system with variable mass and damping-antidamping effect due to star wind | We study two-bodies gravitational problem where the mass of one of the bodies
varies and suffers a damping-antidamping effect due to star wind during its
motion. A constant of motion, a Lagrangian and a Hamiltonian are given for the
radial motion of the system, and the period of the body is studied using the
constant o... | 0910.4684v2 |
2012-03-02 | Damping-Antidamping Effect on Comets Motion | We make an observation about Galilean transformation on a 1-D mass variable
systems which leads us to the right way to deal with mass variable systems.
Then using this observation, we study two-bodies gravitational problem where
the mass of one of the bodies varies and suffers a damping-antidamping effect
due to star w... | 1203.0495v2 |
2012-03-09 | Collective Light Emission of a Finite Size Atomic Chain | Radiative properties of collective electronic states in a one dimensional
atomic chain are investigated. Radiative corrections are included with
emphasize put on the effect of the chain size through the dependence on both
the number of atoms and the lattice constant. The damping rates of collective
states are calculate... | 1203.2094v1 |
2022-11-18 | Energy decay estimates for an axially travelling string damped at one end | We study the small vibrations of an axially travelling string with a
dashpoint damping at one end. The string is modelled by a wave equation in a
time-dependent interval with two endpoints moving at a constant speed $v$. For
the undamped case, we obtain a conserved functional equivalent to the energy of
the solution. W... | 2211.10537v1 |
2023-04-19 | Inviscid damping of monotone shear flows for 2D inhomogeneous Euler equation with non-constant density in a finite channel | We prove the nonlinear inviscid damping for a class of monotone shear flows
with non-constant background density for the two-dimensional ideal
inhomogeneous fluids in $\mathbb{T}\times [0,1]$ when the initial perturbation
is in Gevrey-$\frac{1}{s}$ ($\frac{1}{2}<s<1$) class with compact support. | 2304.09841v2 |
2023-07-27 | Best Ulam constants for damped linear oscillators with variable coefficients | This study uses an associated Riccati equation to study the Ulam stability of
non-autonomous linear differential vector equations that model the damped
linear oscillator. In particular, the best (minimal) Ulam constants for these
non-autonomous linear differential vector equations are derived. These robust
results appl... | 2307.15103v1 |
2019-11-02 | Soft contribution to the damping rate of a hard photon in a weakly magnetized hot medium | We consider weakly magnetized hot QED plasma comprising electrons and
positrons. There are three distinct dispersive (longitudinal and two
transverse) modes of a photon in a thermo-magnetic medium. At lowest order in
coupling constant, photon is damped in this medium via Compton scattering and
pair creation process. We... | 1911.00744v2 |
2023-06-05 | Damping of coronal oscillations in self-consistent 3D radiative MHD simulations of the solar atmosphere | Oscillations are abundant in the solar corona. Coronal loop oscillations are
typically studied using highly idealised models of magnetic flux tubes. In
order to improve our understanding of coronal oscillations, it is necessary to
consider the effect of realistic magnetic field topology and density
structuring. We anal... | 2306.02770v1 |
2006-06-05 | Phenomenological theory of current driven exchange switching in ferromagnetic nanojunctions | Phenomenological approach is developed in the theory of spin-valve type
ferromagnetic junctions to describe exchange switching by current flowing
perpendicular to interfaces. Forward and backward current switching effects are
described and they may be principally different in nature. Mobile electron
spins are considere... | 0606102v2 |
2009-01-15 | The sound damping constant for generalized theories of gravity | The near-horizon metric for a black brane in Anti-de Sitter (AdS) space and
the metric near the AdS boundary both exhibit hydrodynamic behavior. We
demonstrate the equivalence of this pair of hydrodynamic systems for the sound
mode of a conformal theory. This is first established for Einstein's gravity,
but we then sho... | 0901.2191v1 |
1996-01-09 | Relaxation of Collective Excitations in LJ-13 Cluster | We have performed classical molecular dynamics simulation of $Ar_{13}$
cluster to study the behavior of collective excitations. In the solid ``phase''
of the cluster, the collective oscillation of the monopole mode can be well
fitted to a damped harmonic oscillator. The parameters of the equivalent damped
harmonic osci... | 9601026v2 |
2005-04-22 | Constraint damping in the Z4 formulation and harmonic gauge | We show that by adding suitable lower-order terms to the Z4 formulation of
the Einstein equations, all constraint violations except constant modes are
damped. This makes the Z4 formulation a particularly simple example of a
lambda-system as suggested by Brodbeck et al. We also show that the Einstein
equations in harmon... | 0504114v2 |
2008-10-21 | On Wigner functions and a damped star product in dissipative phase-space quantum mechanics | Dito and Turrubiates recently introduced an interesting model of the
dissipative quantum mechanics of a damped harmonic oscillator in phase space.
Its key ingredient is a non-Hermitian deformation of the Moyal star product
with the damping constant as deformation parameter. We compare the
Dito-Turrubiates scheme with p... | 0810.3893v1 |
2015-02-01 | Nonlocal Damping of Helimagnets in One-Dimensional Interacting Electron Systems | We investigate the magnetization relaxation of a one-dimensional helimagnetic
system coupled to interacting itinerant electrons. The relaxation is assumed to
result from the emission of plasmons, the elementary excitations of the
one-dimensional interacting electron system, caused by slow changes of the
magnetization p... | 1502.00268v2 |
2017-07-08 | Nonlinear dynamics of damped DNA systems with long-range interactions | We investigate the nonlinear dynamics of a damped Peyrard-Bishop DNA model
taking into account long-range interactions with distance dependence |l|^-s on
the elastic coupling constant between different DNA base pairs. Considering
both Stokes and long-range hydrodynamical damping forces, we use the discrete
difference o... | 1707.02425v1 |
2017-09-12 | Temperature effects on MIPs in the BGO calorimeters of DAMPE | In this paper, we presented a study of temperature effects on BGO
calorimeters using proton MIP's collected in the first year operation of DAMPE.
By directly comparing MIP calibration constants used by DAMPE data production
pipe line, we found an experimental relation between temperature and signal
amplitudes of each B... | 1709.03735v2 |
2018-04-02 | Anisotropic Gilbert damping in perovskite La$_{0.7}$Sr$_{0.3}$MnO$_{3}$ thin film | The viscous Gilbert damping parameter governing magnetization dynamics is of
primary importance for various spintronics applications. Although, the damping
constant is believed to be anisotropic by theories. It is commonly treated as a
scalar due to lack of experimental evidence. Here, we present an elaborate
angle dep... | 1804.00554v1 |
2019-07-10 | Determination of the damping co-efficient of electrons in optically transparent glasses at the true resonance frequency in the ultraviolet from an analysis of the Lorentz-Maxwell model of dispersion | The Lorentz-Maxwell model of dispersion of light has been analyzed in this
paper to determine the true resonance frequency in the ultraviolet for the
electrons in optically transparent glasses and the damping coefficient at this
frequency. For this we needed the refractive indices of glass in the optical
frequency rang... | 1907.04499v1 |
2019-07-10 | The superior role of the Gilbert damping on the signal-to-noise ratio in heat-assisted magnetic recording | In magnetic recording the signal-to-noise ratio (SNR) is a good indicator for
the quality of written bits. However, a priori it is not clear which parameters
have the strongest influence on the SNR. In this work, we investigate the role
of the Gilbert damping on the SNR. Grains consisting of FePt like hard magnetic
mat... | 1907.04577v2 |
2019-07-21 | Critical Thresholds in One Dimensional Damped Euler-Poisson Systems | This paper is concerned with the critical threshold phenomenon for one
dimensional damped, pressureless Euler-Poisson equations with electric force
induced by a constant background, originally studied in [S. Engelberg and H.
Liu and E. Tadmor, Indiana Univ. Math. J., 50:109--157, 2001]. A simple
transformation is used ... | 1907.09039v1 |
2022-06-17 | Resolvent estimates for the one-dimensional damped wave equation with unbounded damping | We study the generator $G$ of the one-dimensional damped wave equation with
unbounded damping. We show that the norm of the corresponding resolvent
operator, $\| (G - \lambda)^{-1} \|$, is approximately constant as $|\lambda|
\to +\infty$ on vertical strips of bounded width contained in the closure of
the left-hand sid... | 2206.08820v2 |
2023-12-14 | Smoluchowski-Kramers diffusion approximation for systems of stochastic damped wave equations with non-constant friction | We consider systems of damped wave equations with a state-dependent damping
coefficient and perturbed by a Gaussian multiplicative noise. Initially, we
investigate their well-posedness, under quite general conditions on the
friction. Subsequently, we study the validity of the so-called
Smoluchowski-Kramers diffusion ap... | 2312.08925v1 |
2024-01-01 | Magnon Damping Minimum and Logarithmic Scaling in a Kondo-Heisenberg Model | Recently, an anomalous temperature evolution of spin wave excitations has
been observed in a van der Waals metallic ferromagnet Fe$_3$GeTe$_2$ (FGT) [S.
Bao, et al., Phys. Rev. X 12, 011022 (2022)], whose theoretical understanding
yet remains elusive. Here we study the spin dynamics of a ferromagnetic
Kondo-Heisenberg ... | 2401.00758v1 |
2024-01-19 | Upper bound of the lifespan of the solution to the nonlinear fractional wave equations with time-dependent damping | In this paper, we study the Cauchy problem of the nonlinear wave equation
with fractional Laplacian and time-dependent damping. Firstly, we derive the
weighted Sobolev estimate of the solution operators for the linear wave
equation with the damping of constant coefficient, and prove the local
existence and uniqueness i... | 2401.10552v1 |
2024-03-13 | Effects of wave damping and finite perpendicular scale on three-dimensional Alfvén wave parametric decay in low-beta plasmas | Shear Alfven wave parametric decay instability (PDI) provides a potential
path toward significant wave dissipation and plasma heating. However,
fundamental questions regarding how PDI is excited in a realistic
three-dimensional (3D) open system and how critically the finite perpendicular
wave scale -- as found in both ... | 2403.08179v1 |
2001-09-05 | Nuclear resonant scattering of Synchrotron radiation from nuclei in the Browninan motion | The time evolution of the coherent forward scattering of Synchrotron
radiation for resonant nuclei in Brownian motion is studied . Apart from target
thickness, the appearance of dynamical beats also depends on $\alpha$ which is
the ratio of harmonic force constant to the damping force constant of a
harmonic oscillator ... | 0109074v2 |
2007-02-07 | Relativistic r-modes and shear viscosity | We derive the relativistic equations for stellar perturbations, including in
a consistent way shear viscosity in the stress-energy tensor, and we
numerically integrate our equations in the case of large viscosity. We consider
the slow rotation approximation, and we neglect the coupling between polar and
axial perturbat... | 0702040v1 |
2009-08-19 | Nonlinear viscoelastic wave propagation: an extension of Nearly Constant Attenuation (NCQ) models | Hysteretic damping is often modeled by means of linear viscoelastic
approaches such as "nearly constant Attenuation (NCQ)" models. These models do
not take into account nonlinear effects either on the stiffness or on the
damping, which are well known features of soil dynamic behavior. The aim of
this paper is to propos... | 0908.2715v2 |
2012-05-06 | Fractional wave equation and damped waves | In this paper, a fractional generalization of the wave equation that
describes propagation of damped waves is considered. In contrast to the
fractional diffusion-wave equation, the fractional wave equation contains
fractional derivatives of the same order $\alpha,\ 1\le \alpha \le 2$ both in
space and in time. We show ... | 1205.1199v2 |
2013-04-22 | Constant residual electrostatic electron plasma mode in Vlasov-Ampere system | In a collisionless Vlasov-Poisson (V-P) electron plasma system, two types of
modes for electric field perturbation exist: the exponentially Landau damped
electron plasma waves and the initial-value sensitive ballistic modes. Here,
the V-P system is modified slightly to a Vlasov-Ampere (V-A) system. A new
constant resid... | 1304.5883v2 |
2014-02-28 | A new way to evaluate x-ray Brillouin scattering data | Making use of the classical second moment sum rule, it is possible to convert
a series of constant-Q x-ray Brillouin scattering scans (Q momentum transfer)
into a series of constant frequency scans over the measured $Q$ range. The
method is applied to literature results for the phonon dispersion in liquid
vitreous sili... | 1402.7237v1 |
2014-08-27 | Quasi-particle Lifetime in a Mixture of Bose and Fermi Superfluids | In this letter, to reveal the effect of quasi-particle interactions in a
Bose-Fermi superfluid mixture, we consider the lifetime of quasi-particle of
Bose superfluid due to its interaction with quasi-particles in Fermi
superfluid. We find that this damping rate, i.e. inverse of the lifetime, has
quite different thresho... | 1408.6419v1 |
2015-02-24 | High Quality Yttrium Iron Garnet Grown by Room Temperature Pulsed Laser Deposition and Subsequent Annealing | We have investigated recrystallization of amorphous Yttrium Iron Garnet (YIG)
by annealing in oxygen atmosphere. Our findings show that well below the
melting temperature the material transforms into a fully epitaxial layer with
exceptional quality, both structural and magnetic.\\ In ferromagnetic resonance
(FMR) ultra... | 1502.06724v2 |
2015-03-04 | Critical current destabilizing perpendicular magnetization by the spin Hall effect | The critical current needed to destabilize the magnetization of a
perpendicular ferromagnet via the spin Hall effect is studied. Both the
dampinglike and fieldlike torques associated with the spin current generated by
the spin Hall effect is included in the Landau-Lifshitz-Gilbert equation to
model the system. In the a... | 1503.01478v2 |
2015-09-06 | Study of spin dynamics and damping on the magnetic nanowire arrays with various nanowire widths | We investigate the spin dynamics including Gilbert damping in the
ferromagnetic nanowire arrays. We have measured the ferromagnetic resonance of
ferromagnetic nanowire arrays using vector-network analyzer ferromagnetic
resonance (VNA-FMR) and analyzed the results with the micromagnetic
simulations. We find excellent ag... | 1509.01807v1 |
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