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2022-06-25 | Decay estimate in a viscoelastic plate equation with past history, nonlinear damping, and logarithmic nonlinearity | In this article, we consider a viscoelastic plate equation with past history,
nonlinear damping, and logarithmic nonlinearity. We prove explicit and general
decay rate results of the solution to the viscoelastic plate equation with past
history. Convex properties, logarithmic inequalities, and generalised Young's
inequ... | 2206.12561v1 |
2022-06-30 | Effect of a viscous fluid shell on the propagation of gravitational waves | In this paper we show that there are circumstances in which the damping of
gravitational waves (GWs) propagating through a viscous fluid can be highly
significant; in particular, this applies to Core Collapse Supernovae (CCSNe).
In previous work, we used linearized perturbations on a fixed background within
the Bondi-S... | 2206.15103v2 |
2022-09-07 | Blow up and lifespan estimates for systems of semi-linear wave equations with dampings and potentials | In this paper, we consider the semi-linear wave systems with
power-nonlinearities and space-dependent dampings and potentials. We obtain the
blow-up regions for three types wave systems as well as the lifespan estimates. | 2209.02920v1 |
2022-12-04 | Inverse problem of recovering the time-dependent damping and nonlinear terms for wave equations | In this paper, we consider the inverse boundary problems of recovering the
time-dependent nonlinearity and damping term for a semilinear wave equation on
a Riemannian manifold. The Carleman estimate and the construction of Gaussian
beams together with the higher order linearization are respectively used to
derive the u... | 2212.01815v2 |
2022-12-14 | Gevrey regularity for the Euler-Bernoulli beam equation with localized structural damping | We study a Euler-Bernoulli beam equation with localized discontinuous
structural damping. As our main result, we prove that the associated
$C_0$-semigroup $(S(t))_{t\geq0}$ is of Gevrey class $\delta>24$ for $t>0$,
hence immediately differentiable. Moreover, we show that $(S(t))_{t\geq0}$ is
exponentially stable. | 2212.07110v1 |
2022-12-28 | On extended lifespan for 1d damped wave equation | In this manuscript, a sharp lifespan estimate of solutions to semilinear
classical damped wave equation is investigated in one dimensional case, when
the sum of initial position and speed is $0$ pointwisely. Especially, an
extension of lifespan is shown in this case. Moreover, existence of some global
solutions are obt... | 2212.13845v1 |
2023-02-06 | Uniform stabilization of an acoustic system | We study the problem of stabilization for the acoustic system with a
spatially distributed damping. With imposing hypothesis on the structural
properties of the damping term, we identify exponential decay of solutions with
growing time. | 2302.02726v1 |
2023-04-23 | Decay rates for a variable-coefficient wave equation with nonlinear time-dependent damping | In this paper, a class of variable-coefficient wave equations equipped with
time-dependent damping and the nonlinear source is considered. We show that the
total energy of the system decays to zero with an explicit and precise decay
rate estimate under different assumptions on the feedback with the help of the
method o... | 2304.11522v1 |
2023-05-22 | Fast energy decay for wave equation with a monotone potential and an effective damping | We consider the total energy decay of the Cauchy problem for wave equations
with a potential and an effective damping. We treat it in the whole
one-dimensional Euclidean space. Fast energy decay is established with the help
of potential. The proofs of main results rely on a multiplier method and
modified techniques ado... | 2305.12666v1 |
2023-08-03 | Blow-up for semilinear wave equations with damping and potential in high dimensional Schwarzschild spacetime | In this work, we study the blow up results to power-type semilinear wave
equation in the high dimensional Schwarzschild spacetime, with damping and
potential terms. We can obtain the upper bound estimates of lifespan without
the assumption that the support of the initial date should be far away from the
black hole. | 2308.01691v1 |
2023-08-22 | Lifespan estimates for 1d damped wave equation with zero moment initial data | In this manuscript, a sharp lifespan estimate of solutions to semilinear
classical damped wave equation is investigated in one dimensional case when the
Fourier 0th moment of sum of initial position and speed is $0$. Especially, it
is shown that the behavior of lifespan changes with $p=3/2$ with respect to the
size of ... | 2308.11113v1 |
2023-09-01 | Damped Euler system with attractive Riesz interaction forces | We consider the barotropic Euler equations with pairwise attractive Riesz
interactions and linear velocity damping in the periodic domain. We establish
the global-in-time well-posedness theory for the system near an equilibrium
state. We also analyze the large-time behavior of solutions showing the
exponential rate of ... | 2309.00210v1 |
2023-10-02 | The damped wave equation and associated polymer | Considering the damped wave equation with a Gaussian noise $F$ where $F$ is
white in time and has a covariance function depending on spatial variables, we
will see that this equation has a mild solution which is stationary in time
$t$. We define a weakly self-avoiding polymer with intrinsic length $J$
associated to thi... | 2310.01631v1 |
2023-10-17 | Indirect boundary stabilization for weakly coupled degenerate wave equations under fractional damping | In this paper, we consider the well-posedness and stability of a
one-dimensional system of degenerate wave equations coupled via zero order
terms with one boundary fractional damping acting on one end only. We prove
optimal polynomial energy decay rate of order $1/t^{(3-\tau)}$. The method is
based on the frequency dom... | 2310.11174v1 |
2024-03-11 | Uniform estimates for solutions of nonlinear focusing damped wave equations | For a damped wave (or Klein-Gordon) equation on a bounded domain, with a
focusing power-like nonlinearity satisfying some growth conditions, we prove
that a global solution is bounded in the energy space, uniformly in time. Our
result applies in particular to the case of a cubic equation on a bounded
domain of dimensio... | 2403.06541v1 |
1995-10-27 | Radiation Damping and Quantum Excitation for Longitudinal Charged Particle Dynamics in the Thermal Wave Model | On the basis of the recently proposed {\it Thermal Wave Model (TWM) for
particle beams}, we give a description of the longitudinal charge particle
dynamics in circular accelerating machines by taking into account both
radiation damping and quantum excitation (stochastic effect), in presence of a
RF potential well. The ... | 9510004v1 |
1994-02-04 | Constraints on Models of Galaxy Formation from the Evolution of Damped Ly$α$ Absorption Systems | There is accumulating observational evidence suggesting that damped
Ly$\alpha$ absorption systems systems are the progenitors of present-day spiral
galaxies. We use the observed properties of these systems to place constraints
on the history of star formation in galactic disks, and on cosmological
theories of structure... | 9402015v1 |
1999-02-11 | The HI Column Density Distribution Function at z=0: the Connection to Damped Ly alpha Statistics | We present a measurement of the HI column density distribution function,
f(N), at the present epoch for column densities log N > 20 cm^-2. These high
column densities compare to those measured in damped Ly alpha lines seen in
absorption against background quasars. Although observationally rare, it
appears that the bulk... | 9902171v1 |
2000-10-27 | Planetary Torques as the Viscosity of Protoplanetary Disks | We revisit the idea that density-wave wakes of planets drive accretion in
protostellar disks. The effects of many small planets can be represented as a
viscosity if the wakes damp locally, but the viscosity is proportional to the
damping length. Damping occurs mainly by shocks even for earth-mass planets.
The excitatio... | 0010576v1 |
2000-12-27 | Constraining Dark Matter candidates from structure formation | We show that collisional damping of adiabatic primordial fluctuations yields
constraints on the possible range of mass and interaction rates of Dark Matter
particles. Our analysis relies on a general classification of Dark Matter
candidates, that we establish independently of any specific particle theory or
model. From... | 0012504v2 |
2001-07-26 | The Contribution of HI-Rich Galaxies to the Damped Absorber Population at z=0 | We present a study of HI-rich galaxies in the local universe selected from
blind emission-line surveys. These galaxies represent the emission-line
counterparts of local damped Lyman-alpha systems. We find that the HI
cross-section of galaxies is drawn from a large range of galaxy masses below
M_star, 66% of the area co... | 0107495v1 |
2003-11-17 | Cosmic Ray Scattering by Compressible Magnetohydrodynamic Turbulence | Recent advances in understanding of magnetohydrodynamic (MHD) turbulence call
for substantial revisions in the picture of cosmic ray transport. In this paper
we use recently obtained scaling laws for MHD modes to calculate the scattering
frequency for cosmic rays in the ISM. We consider gyroresonance with MHD modes
(Al... | 0311369v1 |
2003-11-17 | Wave damping by MHD turbulence and its effect upon cosmic ray propagation in the ISM | Cosmic rays scatter off magnetic irregularities (Alfven waves) with which
they are resonant, that is waves of wavelength comparable to their gyroradii.
These waves may be generated either by the cosmic rays themselves, if they
stream faster than the Alfven speed, or by sources of MHD turbulence. Waves
excited by stream... | 0311400v1 |
2004-10-25 | Constraints on Dark Matter interactions from structure formation: Damping lengths | (Shortened) Weakly Interacting Massive Particles are often said to be the
best Dark Matter candidates. Studies have shown however that rather large Dark
Matter-photon or Dark Matter-baryon interactions could be allowed by cosmology.
Here we address the question of the role of the Dark Matter interactions in
more detail... | 0410591v1 |
2005-10-10 | Collisional dissipation of Alfvén waves in a partially ionised solar chromosphere | Certain regions of the solar atmosphere are at sufficiently low temperatures
to be only partially ionised. The lower chromosphere contains neutral atoms,
the existence of which greatly increases the efficiency of the damping of waves
due to collisional friction momentum transfer. More specifically the Cowling
conductiv... | 0510265v1 |
2006-04-10 | The Nearby Damped Lyman-alpha Absorber SBS 1543+593: A Large HI Envelope in a Gas-Rich Galaxy Group | We present a Very Large Array (VLA) HI 21cm map and optical observations of
the region around one of the nearest damped Lyman-alpha absorbers beyond the
local group, SBS 1543+593. Two previously uncataloged galaxies have been
discovered and a redshift has been determined for a third. All three of these
galaxies are at ... | 0604220v1 |
2006-08-02 | SINS of Viscosity Damped Turbulence | The problems with explaining the Small Ionized and Neutral Structures (SINS)
appealing to turbulence stem from inefficiency of the Kolmogorov cascade in
creating large fluctuations at sufficiently small scales. However, other types
of cascades are possible. When magnetic turbulence in a fluid with viscosity
that is muc... | 0608046v3 |
1998-01-13 | Comparative Study of the Adiabatic Evolution of a Nonlinear Damped Oscillator and an Hamiltonian Generalized Nonlinear Oscillator | In this paper we study to what extent the canonical equivalence and the
identity of the geometric phases of dissipative and conservative linear
oscillators, established in a preceeding paper, can be generalized to nonlinear
ones. Considering first the 1-D quartic generalized oscillator we determine, by
means of a pertu... | 9801017v1 |
1995-03-20 | Quasiparticle damping in two-dimensional superconductors with unconventional pairing. | We calculate the damping of excitations due to four-fermionic interaction in
the case of two-dimensional superconductor with nodes in the spectrum. At zero
temperature and low frequencies it reveals gapless $\omega^3$ behavior at the
nodal points. With the frequency increasing the crossover to the normal-state
regimes ... | 9503112v1 |
1997-10-14 | Damping of Hydrodynamic Modes in a Trapped Bose Gas above the Bose-Einstein Transition Temperature | We calculate the damping of low-lying collective modes of a trapped Bose gas
in the hydrodynamic regime, and show that this comes solely from the shear
viscosity, since the contributions from bulk viscosity and thermal conduction
vanish. The hydrodynamic expression for the damping diverges due to the failure
of hydrody... | 9710130v2 |
1997-12-24 | Thermal dephasing and the echo effect in a confined Bose-Einstein condensate | It is shown that thermal fluctuations of the normal component induce
dephasing -- reversible damping of the low energy collective modes of a
confined Bose-Einstein condensate. The dephasing rate is calculated for the
isotropic oscillator trap, where Landau damping is expected to be suppressed.
This rate is characterize... | 9712287v1 |
1998-09-29 | Numerical test of the damping time of layer-by-layer growth on stochastic models | We perform Monte Carlo simulations on stochastic models such as the
Wolf-Villain (WV) model and the Family model in a modified version to measure
mean separation $\ell$ between islands in submonolayer regime and damping time
$\tilde t$ of layer-by-layer growth oscillations on one dimension. The
stochastic models are mo... | 9809382v1 |
2000-01-10 | Enhanced vortex damping by eddy currents in superconductor-semiconduc tor hybrids | An enhancement of vortex-motion damping in thin Pb/In superconducting films
is obtained through coupling to an adjacent two-dimensional electron gas formed
in a modulation-doped GaAs/AlGaAs heterostructure. This effect is observed by
monitoring the power dissipation at the superconductor in the vortex state
while incre... | 0001123v1 |
2000-10-11 | The experimental observation of Beliaev damping in a Bose condensed gas | We report the first experimental observation of Beliaev damping of a
collective excitation in a Bose-condensed gas. Beliaev damping is not predicted
by the Gross-Pitaevskii equation and so this is one of the few experiments that
tests BEC theory beyond the mean field approximation. Measurements of the
amplitude of a hi... | 0010157v1 |
2001-06-18 | AC induced damping of a fluxon in long Josephson junction | We present a theoretical and experimental study of Josephson vortex (fluxon)
moving in the presence of spatially homogeneous dc and ac bias currents. By
mapping this problem to the problem of calculating the current-voltage
characteristic of a small Josephson junction, we derive the dependence of the
average fluxon vel... | 0106337v1 |
2002-03-20 | Microscopic nonequilibrium dynamics of an inhomogeneous Bose gas beyond the Born approximation | Using the prescription of the nonequilibrium statistical operator method, we
derive a non-Markovian generalization to the kinetic theory described by Walser
{\sl et al.} [Phys. Rev. A {\bf 59}, 3878 (1999)]. Quasi-particle damping and
effects arising from the finite duration of a collision are introduced to
include ter... | 0203415v1 |
2003-02-17 | Magnetization dynamics with a spin-transfer torque | The magnetization reversal and dynamics of a spin valve pillar, whose lateral
size is 64$\times$64 nm$^2$, are studied by using micromagnetic simulation in
the presence of spin transfer torque. Spin torques display both characteristics
of magnetic damping (or anti-damping) and of an effective magnetic field. For a
stea... | 0302337v1 |
2003-05-12 | Landau damping in trapped Bose-condensed gases | We study Landau damping in dilute Bose-Einstein condensed gases in both
spherical and prolate ellipsoidal harmonic traps. We solve the Bogoliubov
equations for the mode spectrum in both of these cases, and calculate the
damping by summing over transitions between excited quasiparticle states. The
results for the spheri... | 0305251v1 |
2003-05-27 | Damped finite-time-singularity driven by noise | We consider the combined influence of linear damping and noise on a dynamical
finite-time-singularity model for a single degree of freedom. We find that the
noise effectively resolves the finite-time-singularity and replaces it by a
first-passage-time or absorbing state distribution with a peak at the
singularity and a... | 0305630v1 |
2003-06-05 | On Surface Plasmon Damping in Metallic Nanoparticles | Two possible mechanisms of surface plasmon (SP) oscillations damping in
metallic nanoparticles (MNPs), not connected with electron-phonon interaction
are investigated theoretically: a) the radiation damping of SP, b) resonant
coupling of SP oscillations with electronic transitions in matrix. It is shown
that the radiat... | 0306123v1 |
2003-09-11 | Frequency and damping of hydrodynamic modes in a trapped Bose-condensed gas | Recently it was shown that the Landau-Khalatnikov two-fluid hydrodynamics
describes the collision-dominated region of a trapped Bose condensate
interacting with a thermal cloud. We use these equations to discuss the low
frequency hydrodynamic collective modes in a trapped Bose gas at finite
temperatures. We derive a va... | 0309269v1 |
2003-11-13 | Damping of Bogoliubov Excitations in Optical Lattices | Extending recent work to finite temperatures, we calculate the Landau damping
of a Bogoliubov excitation in an optical lattice, due to coupling to a thermal
cloud of such excitations. For simplicity, we consider a 1D Bose-Hubbard model
and restrict ourselves to the first energy band. For energy conservation to be
satis... | 0311321v1 |
2004-09-22 | Symmetry breaking in driven and strongly damped pendulum | We examine the conditions for appearance of symmetry breaking bifurcation in
damped and periodically driven pendulum in the case of strong damping. We show
that symmetry breaking, unlike other nonlinear phenomena, can exist at high
dissipation. We prove that symmetry breaking phases exist between phases of
symmetric no... | 0409572v1 |
2004-10-19 | Strongly inhibited transport of a 1D Bose gas in a lattice | We report the observation of strongly damped dipole oscillations of a quantum
degenerate 1D atomic Bose gas in a combined harmonic and optical lattice
potential. Damping is significant for very shallow axial lattices (0.25 photon
recoil energies), and increases dramatically with increasing lattice depth,
such that the ... | 0410491v3 |
2005-08-10 | Collective oscillations of a quasi one dimensional Bose condensate under damping | Influence of the damping on collective oscillations of a one-dimensional
trapped Bose gas in the mean field regime has been studied. Using the
phenomenological damping approach developed by L.P. Pitaevskii, modified
variational equations for the parameters of the condensate wave function is
derived. Analytical expressi... | 0508262v1 |
2005-08-11 | Influence of layer defects on the damping in ferroelectric thin films | A Green's function technique for a modified Ising model in a transverse field
is applied, which allows to calculate the damping of the elementary excitations
and the phase transition temperature of ferroelectric thin films with
structural defects. Based on an analytical expression for the damping function,
we analyze i... | 0508287v1 |
2007-02-23 | Parametric Resonance of Optically Trapped Aerosols | The Brownian dynamics of an optically trapped water droplet are investigated
across the transition from over to under-damped oscillations. The spectrum of
position fluctuations evolves from a Lorentzian shape typical of over-damped
systems (beads in liquid solvents), to a damped harmonic oscillator spectrum
showing a r... | 0702557v1 |
2007-03-22 | Spin-Torque Ferromagnetic Resonance Measurements of Damping in Nanomagnets | We measure the magnetic damping parameter a in thin film CoFeB and permalloy
(Py) nanomagnets at room temperature using ferromagnetic resonance driven by
microwave frequency spin-transfer torque. We obtain $\alpha_{CoFeB} = 0.014 \pm
0.003$ and $\alpha_{Py}=0.010 \pm 0.002$, values comparable to measurements for
extend... | 0703577v1 |
2007-02-28 | Numerical Model For Vibration Damping Resulting From the First Order Phase Transformations | A numerical model is constructed for modelling macroscale damping effects
induced by the first order martensite phase transformations in a shape memory
alloy rod. The model is constructed on the basis of the modified
Landau-Ginzburg theory that couples nonlinear mechanical and thermal fields.
The free energy function f... | 0702172v1 |
2005-07-05 | Universality of Highly Damped Quasinormal Modes for Single Horizon Black Holes | It has been suggested that the highly damped quasinormal modes of black holes
provide information about the microscopic quantum gravitational states
underlying black hole entropy. This interpretation requires the form of the
highly damped quasinormal mode frequency to be universally of the form:
$\hbar\omega_R = \ln(l)... | 0507019v1 |
2005-09-07 | Massive vector field perturbations in the Schwarzschild background: stability and quasinormal spectrum | We consider the perturbations of the massive vector field around
Schwarzschild black hole, (generally, with non-vanishing $\Lambda$ - term). The
monopole massive vector perturbation equations can be reduced to a single
wave-like equation. We have proved the stability against these perturbations
and investigated the qua... | 0509026v3 |
2006-11-27 | The Mystery of the Asymptotic Quasinormal Modes of Gauss-Bonnet Black Holes | We analyze the quasinormal modes of $D$-dimensional Schwarzschild black holes
with the Gauss-Bonnet correction in the large damping limit and show that
standard analytic techniques cannot be applied in a straightforward manner to
the case of infinite damping. However, by using a combination of analytic and
numeric tech... | 0611139v1 |
1995-09-22 | Damping rate of neutrinos in the singlet Majoron model | The damping rate and free path of neutrinos in the singlet Majoron model have
been calculated including both finite temperature and symmetry breaking
effects. The behaviour of right- and left-handed fermions are found inherently
different. While the damping rates of the left-handed leptons are essentially
model indepen... | 9509359v1 |
1996-09-25 | The hot baryon violation rate is $O(α_W^5 T^4)$ | The rate per unit volume for anomalous electroweak baryon number violation at
high temperatures, in the symmetric phase, has been estimated in the literature
to be $O(\alpha_W^4 T^4)$ based on simple scaling arguments. We argue that
damping effects in the plasma suppress the rate by an extra power of $\alpha_W$
to give... | 9609481v1 |
2001-03-29 | Phase transition dynamics in the hot Abelian Higgs model | We present a detailed numerical study of the equilibrium and non-equilibrium
dynamics of the phase transition in the finite-temperature Abelian Higgs model.
Our simulations use classical equations of motion both with and without
hard-thermal-loop corrections, which take into account the leading quantum
effects. From th... | 0103311v1 |
1996-04-12 | Onset of Rotational Damping in Superdeformed Nuclei | We discuss damping of the collective rotational motion in $A\sim 150$
superdeformed nuclei by means of a shell model combining the cranked Nilsson
mean-filed and the surface-delta two-body residual force. It is shown that,
because of the shell structure associated with the superdeformed mean-field,
onset energy of the ... | 9604015v1 |
2001-09-12 | The damping width of giant dipole resonances of cold and hot nuclei: a macroscopic model | A phenomenological macroscopic model of the Giant Dipole Resonance (GDR)
damping width of cold- and hot-nuclei with ground-state spherical and
near-spherical shapes is developed. The model is based on a generalized Fermi
Liquid model which takes into account the nuclear surface dynamics. The
temperature dependence of t... | 0109034v1 |
2006-01-31 | Small damping approach in Fermi-liquid theory | The validity of small damping approximation (SDA) for the quasi-classical
description of the averaged properties of nuclei at high temperatures is
studied within the framework of collisional kinetic theory. The isoscalar
collective quadrupole vibrations in hot nuclei are considered. We show that the
extension of the SD... | 0601094v1 |
2001-11-05 | Damping of transversal plasma-electron oscillations and waves in low-collision electron-ion plasmas | Previously developed method for finding asymptotic solutions of Vlasov
equations using two-dimensional (in coordinate x and time t) Laplace transform
is here applied to consider transversal oscillations and waves in low-collision
quasi-neutral (n_i \simeq n_e) Maxwellian electron-ion plasmas. We obtain two
branches of ... | 0111014v3 |
2002-03-13 | Enhanced radiative ion cooling | Enhanced radiative cooling of ion beams in storage rings and Robinson's
damping criterion are discussed. | 0203036v1 |
2003-05-24 | Impact of the Wiggler Coherent Synchrotron Radiation Impedance on the Beam Instability | Coherent Synchrotron Radiation (CSR) can play an important role by not only
increasing the energy spread and emittance of a beam, but also leading to a
potential instability. Previous studies of the CSR induced longitudinal
instability were carried out for the CSR impedance due to dipole magnets.
However, many storage ... | 0305107v1 |
2004-09-13 | Landau damping in thin films irradiated by a strong laser field | The rate of linear collisionless damping (Landau damping) in a classical
electron gas confined to a heated ionized thin film is calculated. The general
expression for the imaginary part of the dielectric tensor in terms of the
parameters of the single-particle self-consistent electron potential is
obtained. For the cas... | 0409062v1 |
1996-06-24 | Quantum damping of position due to energy measurements | Quantum theory for measurements of energy is introduced and its consequences
for the average position of monitored dynamical systems are analyzed. It turns
out that energy measurements lead to a localization of the expectation values
of other observables. This is manifested, in the case of position, as a damping
of the... | 9606024v1 |
2006-12-17 | Influence of a classical homogeneous gravitational field on dissipative dynamics of the Jaynes-Cummings model with phase damping | In this paper, we study the dissipative dynamics of the Jaynes-Cummings model
with phase damping in the presence of a classical homogeneous gravitational
field. The model consists of a moving two-level atom simultaneously exposed to
the gravitational field and a single-mode traveling radiation field in the
presence of ... | 0612143v2 |
2007-04-25 | Theory of weakly damped free-surface flows: a new formulation based on potential flow solutions | Several theories for weakly damped free-surface flows have been formulated.
In this paper we use the linear approximation to the Navier-Stokes equations to
derive a new set of equations for potential flow which include dissipation due
to viscosity. A viscous correction is added not only to the irrotational
pressure (Be... | 0704.3352v1 |
2007-05-25 | The Secular Evolution of a Close Ring-Satellite System: The Excitation of Spiral Bending Waves at a Nearby Gap Edge | The secular perturbations exerted by an inclined satellite orbiting in a gap
in a broad planetary ring tends to excite the inclinations of the nearby ring
particles, and the ring's self-gravity can allow that disturbance to propagate
away in the form of a spiral bending wave. The amplitude of this spiral bending
wave i... | 0705.3797v1 |
2007-06-15 | Anticorrelation between temperature and fluctuations in moderately damped Josephson junctions | We study the influence of dissipation on the switching current statistics of
moderately damped Josephson junctions. Different types of both low- and high-
$T_c$ junctions with controlled damping are studied. The damping parameter of
the junctions is tuned in a wide range by changing temperature, magnetic field,
gate vo... | 0706.2248v1 |
2007-08-06 | Collisionless damping of electron waves in non-Maxwellian plasma | In this paper we have criticized the so-called Landau damping theory. We have
analyzed solutions of the standard dispersion equations for longitudinal
(electric) and transversal (electromagnetic and electron) waves in
half-infinite slab of the uniform collisionless plasmas with non-Maxwellian and
Maxwellian-like electr... | 0708.0748v5 |
2007-08-14 | Preliminary Results on Vibration Damping Properties of Nanoscale-Reinforced Composite Materials | The focus in this paper is an analysis of existing state of the arts directed
toward the development of the next generation of vibration damping systems. The
research work concentrates on an investigation related to
nanoparticles/fibres/tubes-reinforced materials and coatings dynamic
characterization and modeling of th... | 0708.1821v1 |
2007-08-18 | Non-Riemannian geometrical asymmetrical damping stresses on the Lagrange instability of shear flows | It is shown that the physical interpretation of Elie Cartan three-dimensional
space torsion as couple asymmetric stress, has the effect of damping,
previously Riemannian unstable Couette planar shear flow, leading to stability
of the flow in the Lagrangean sense. Actually, since the flow speed is
inversely proportional... | 0708.2467v1 |
2007-12-07 | State transition of a non-Ohmic damping system in a corrugated plane | Anomalous transport of a particle subjected to non-Ohmic damping of the power
$\delta$ in a tilted periodic potential is investigated via Monte Carlo
simulation of generalized Langevin equation. It is found that the system
exhibits two relative motion modes: the locking state and the running state.
Under the surroundin... | 0712.1070v1 |
2007-12-25 | The damped Pinney equation and its applications to dissipative quantum mechanics | The work considers the damped Pinney equation, defined as the model arising
when a linear in velocity damping term is included in the Pinney equation. In
the general case the resulting equation does not admit Lie point symmetries or
is reducible to a simpler form by any obvious coordinate transformation. In
this contex... | 0712.4083v3 |
2008-01-01 | Non-linear equations for electron waves in Maxwellian low-collision ion-electron plasmas | The before described general principles and methodology of calculating
electron wave propagation in homogeneous isotropic half-infinity slab of
Maxwellian plasma with indefinite but in principal value sense taken integrals
in characteristic equations, and the use of 2D Laplace transform method are
applied to an evaluat... | 0801.0286v2 |
2008-02-22 | Radiative Damping and Functional Differential Equations | We propose a general technique to solve the classical many-body problem with
radiative damping. We modify the short-distance structure of Maxwell
electrodynamics. This allows us to avoid runaway solutions as if we had a
covariant model of extended particles. The resulting equations of motion are
functional differential... | 0802.3390v2 |
2008-04-24 | Analytic approximate seismology of transversely oscillating coronal loops | We present an analytic approximate seismic inversion scheme for damped
transverse coronal loop oscillations based on the thin tube and thin boundary
approximation for computing the period and the damping time. Asymptotic
expressions for the period and damping rate are used to illustrate the process
of seismological inv... | 0804.3877v1 |
2008-12-17 | Origin of intrinsic Gilbert damping | The damping of magnetization, represented by the rate at which it relaxes to
equilibrium, is successfully modeled as a phenomenological extension in the
Landau-Lifschitz-Gilbert equation. This is the damping torque term known as
Gilbert damping and its direction is given by the vector product of the
magnetization and i... | 0812.3184v2 |
2009-01-08 | Grand-mother clocks and quiet lasers | Galileo noted in the 16th century that the period of oscillation of a
pendulum is almost independent of the amplitude. However, such a pendulum is
damped by air friction. The latter may be viewed as resulting from air
molecules getting in contact with the pendulum. It follows that air friction,
not only damps the oscil... | 0901.0983v1 |
2009-01-15 | Interaction of fast charged projectiles with two-dimensional electron gas: Interaction and disorder effects | The results of a theoretical investigation on the stopping power of ions
moving in a disordered two-dimensional degenerate electron gas are presented.
The stopping power for an ion is calculated employing linear response theory
using the dielectric function approach. The disorder, which leads to a damping
of plasmons a... | 0901.2249v1 |
2009-02-01 | Non-Markovian Analysis of the Phase Damped Jaynes-Cummings Model in the Presence of a Classical Homogeneous Gravitational Field | In this paper, the non-Markovian dissipative dynamics of the phase damped
Jaynes-Cummings model in the presence of a classical homogeneous gravitational
field will be analyzed. The model consists of a moving two-level atom
simultaneously exposed to the gravitational field and a single-mode traveling
radiation field in ... | 0902.0114v1 |
2009-05-04 | Models of Damped Oscillators in Quantum Mechanics | We consider several models of the damped oscillators in nonrelativistic
quantum mechanics in a framework of a general approach to the dynamics of the
time-dependent Schroedinger equation with variable quadratic Hamiltonians. The
Green functions are explicitly found in terms of elementary functions and the
corresponding... | 0905.0507v6 |
2009-05-28 | Resonant Nonlinear Damping of Quantized Spin Waves in Ferromagnetic Nanowires | We use spin torque ferromagnetic resonance to measure the spectral properties
of dipole-exchange spin waves in permalloy nanowires. Our measurements reveal
that geometric confinement has a profound effect on the damping of spin waves
in the nanowire geometry. The damping parameter of the lowest-energy quantized
spin wa... | 0905.4699v2 |
2009-06-01 | Effect of Decoherence in Ekert-Protocol | We have examined the effect of the decoherence in the Ekert91 quantum
cryptographic protocol. In order to explore this issue we have introduced two
major decoherences, the depolarizing channel and the generalized amplitude
damping, between the singlet source and one of the legitimate users. It is
shown that the depolar... | 0906.0233v1 |
2009-08-05 | Surface plasmon lifetime in metal nanoshells | The lifetime of localized surface plasmon plays an important role in many
aspects of plasmonics and its applications. In small metal nanostructures, the
dominant mechanism restricting plasmon lifetime is size-dependent Landau
damping. We performed quantum-mechanical calculations of Landau damping for the
bright surface... | 0908.0647v3 |
2009-08-12 | Coarse Grained Simulations of a Small Peptide: Effects of Finite Damping and Hydrodynamic Interactions | In the coarse grained Brownian Dynamics simulation method the many solvent
molecules are replaced by random thermal kicks and an effective friction acting
on the particles of interest. For Brownian Dynamics the friction has to be so
strong that the particles' velocities are damped much faster than the duration
of an in... | 0908.1685v1 |
2009-09-01 | Quantum Stackelberg duopoly in the presence of correlated noise | We study the influence of entanglement and correlated noise using correlated
amplitude damping, depolarizing and phase damping channels on the quantum
Stackelberg duopoly. Our investigations show that under the action of amplitude
damping channel a critical point exists for unentangled initial state as well,
at which f... | 0909.0063v2 |
2009-09-04 | Second sound dipole mode in a partially Bose-Einstein condensed gas | We study the second sound dipole mode in a partially Bose-Einstein condensed
gas. This mode is excited by spatially separating and releasing the
center-of-mass of the Bose-Einstein condensate (BEC) with respect to the
thermal cloud, after which the equilibration is observed. The oscillation
frequency and the damping ra... | 0909.0886v1 |
2009-12-30 | Finite dimensional attractor for a composite system of wave/plate equations with localised damping | The long-term behaviour of solutions to a model for acoustic-structure
interactions is addressed; the system is comprised of coupled semilinear wave
(3D) and plate equations with nonlinear damping and critical sources. The
questions of interest are: existence of a global attractor for the dynamics
generated by this com... | 0912.5464v2 |
2010-02-12 | Features of ion acoustic waves in collisional plasmas | The effects of friction on the ion acoustic (IA) wave in fully and partially
ionized plasmas are studied. In a quasi-neutral electron-ion plasma the
friction between the two species cancels out exactly and the wave propagates
without any damping. If the Poisson equation is used instead of the
quasi-neutrality, however,... | 1002.2502v1 |
2010-02-18 | Damping mechanisms for oscillations in solar prominences | Small amplitude oscillations are a commonly observed feature in
prominences/filaments. These oscillations appear to be of local nature, are
associated to the fine structure of prominence plasmas, and simultaneous flows
and counterflows are also present. The existing observational evidence reveals
that small amplitude o... | 1002.3489v2 |
2010-03-07 | Theory of plasmon decay in dense plasmas and warm dense matter | The decay of the Langmuir waves in dense plasmas is not accurately predicted
by the prevalent Landau damping theory. A dielectric function theory is
introduced, predicting much higher damping than the Landau damping theory. This
strong damping is in better agreement with the experimentally observed data in
metals. It i... | 1003.1523v2 |
2010-03-16 | Justification of the symmetric damping model of the dynamical Casimir effect in a cavity with a semiconductor mirror | A "microscopic" justification of the "symmetric damping" model of a quantum
oscillator with time-dependent frequency and time-dependent damping is given.
This model is used to predict results of experiments on simulating the
dynamical Casimir effect in a cavity with a photo-excited semiconductor mirror.
It is shown tha... | 1003.3061v2 |
2010-04-12 | Dissipative Transport of a Bose-Einstein Condensate | We investigate the effects of impurities, either correlated disorder or a
single Gaussian defect, on the collective dipole motion of a Bose-Einstein
condensate of $^7$Li in an optical trap. We find that this motion is damped at
a rate dependent on the impurity strength, condensate center-of-mass velocity,
and interatom... | 1004.1891v2 |
2010-05-23 | Constraining phases of quark matter with studies of r-mode damping in neutron stars | The r-mode instability in rotating compact stars is used to constrain the
phase of matter at high density. The color-flavor-locked phase with kaon
condensation (CFL-K0) and without (CFL) is considered in the temperature range
10^8K < T <10^{11} K. While the bulk viscosity in either phase is only
effective at damping th... | 1005.4161v1 |
2010-07-07 | Observational evidence of resonantly damped propagating kink waves in the solar corona | In this Letter we establish clear evidence for the resonant absorption
damping mechanism by analyzing observational data from the novel Coronal
Multi-Channel Polarimeter (CoMP). This instrument has established that in the
solar corona there are ubiquitous propagating low amplitude ($\approx$1 km
s$^{-1}$) Alfv\'{e}nic ... | 1007.1080v1 |
2010-07-12 | Variable damping and coherence in a high-density magnon gas | We report on the fast relaxation behavior of a high-density magnon gas
created by a parametric amplification process. The magnon gas is probed using
the technique of spin-wave packet recovery by parallel parametric pumping.
Experimental results show a damping behavior which is in disagreement with both
the standard mod... | 1007.1895v3 |
2010-07-21 | A low-power circuit for piezoelectric vibration control by synchronized switching on voltage sources | In the paper, a vibration damping system powered by harvested energy with
implementation of the so-called SSDV (synchronized switch damping on voltage
source) technique is designed and investigated. In the semi-passive approach,
the piezoelectric element is intermittently switched from open-circuit to
specific impedanc... | 1007.3596v1 |
2010-10-24 | Long-time dynamics in plate models with strong nonlinear damping | We study long-time dynamics of a class of abstract second order in time
evolution equations in a Hilbert space with the damping term depending both on
displacement and velocity. This damping represents the nonlinear strong
dissipation phenomenon perturbed with relatively compact terms. Our main result
states the existe... | 1010.4991v1 |
2010-11-05 | Effects of Turbulence, Eccentricity Damping, and Migration Rate on the Capture of Planets into Mean Motion Resonance | Pairs of migrating extrasolar planets often lock into mean motion resonance
as they drift inward. This paper studies the convergent migration of giant
planets (driven by a circumstellar disk) and determines the probability that
they are captured into mean motion resonance. The probability that such planets
enter resona... | 1011.1486v1 |
2010-11-21 | Quasi-normal frequencies: Semi-analytic results for highly damped modes | Black hole highly-damped quasi-normal frequencies (QNFs) are very often of
the form (offset)} + i n (gap). We have investigated the genericity of this
phenomenon for the Schwarzschild--deSitter (SdS) black hole by considering a
model potential that is piecewise Eckart (piecewise Poeschl-Teller), and
developing an analy... | 1011.4634v1 |
2011-03-09 | Nonlinear damping in mechanical resonators based on graphene and carbon nanotubes | Carbon nanotubes and graphene allow fabricating outstanding nanomechanical
resonators. They hold promise for various scientific and technological
applications, including sensing of mass, force, and charge, as well as the
study of quantum phenomena at the mesoscopic scale. Here, we have discovered
that the dynamics of n... | 1103.1788v1 |
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