publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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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 |
2003-05-12 | 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 |
2005-04-22 | 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 |
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 |
2008-10-21 | 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 |
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 |
2011-03-08 | 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 |
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 |
2011-05-03 | Entanglement in a Bipartite Gaussian State | To examine the loss of entanglement in a two-particle Gaussian system, we
couple it to an environment and use the Non-Rotating Wave master equation to
study the system's dynamics. We also present a derivation of this equation. We
consider two different types of evolution. Under free evolution we find that
entanglement ... | 1105.0564v1 |
2011-06-15 | Plasma damping effects on the radiative energy loss of relativistic particles | The energy loss of a relativistic charge undergoing multiple scatterings
while traversing an infinite, polarizable and absorptive plasma is
investigated. Polarization and damping mechanisms in the medium are
phenomenologically modelled by a complex index of refraction. Apart from the
known Ter-Mikaelian effect related ... | 1106.2856v3 |
2011-09-12 | Reduction of compressibility and parallel transfer by Landau damping in turbulent magnetized plasmas | Three-dimensional numerical simulations of decaying turbulence in a
magnetized plasma are performed using a so-called FLR-Landau fluid model which
incorporates linear Landau damping and finite Larmor radius (FLR) corrections.
It is shown that compared to simulations of compressible Hall-MHD, linear
Landau damping is re... | 1109.2636v1 |
2011-09-24 | Existence of weak solutions for the generalized Navier-Stokes equations with damping | In this work we consider the generalized Navier-Stoke equations with the
presence of a damping term in the momentum equation. % The problem studied here
derives from the set of equations which govern the isothermal flow of
incompressible, homogeneous and non-Newtonian fluids. % For the generalized
Navier-Stokes problem... | 1109.5217v1 |
2011-11-14 | New Electrodynamics of Pulsars | We have recently proposed that Force-Free Electrodynamics (FFE) does not
apply to pulsars -- pulsars should be described by the high-conductivity limit
of Strong-Field Electrodynamics (SFE), which predicts an order-unity damping of
the Poynting flux, while FFE postulates zero damping. The strong damping result
has not ... | 1111.3377v1 |
2011-12-20 | Dynamics of DNA breathing in the Peyrard-Bishop model with damping and external force | The impact of damping effect and external forces to the DNA breathing is
investigated within the Peyrard-Bishop model. In in the continuum limit, the
dynamics of the breathing of DNA is described by the forced-damped nonlinear
Schrodinger equation and studied by means of variational method. The analytical
solutions are... | 1112.4715v1 |
2012-01-31 | Parametric amplification and self-oscillation in a nanotube mechanical resonator | A hallmark of mechanical resonators made from a single nanotube is that the
resonance frequency can be widely tuned. Here, we take advantage of this
property to realize parametric amplification and self-oscillation. The gain of
the parametric amplification can be as high as 18.2 dB and tends to saturate at
high paramet... | 1201.6557v1 |
2012-02-22 | Radiation Damping in the Photoionization of Fe^{14+} | A theoretical investigation of photoabsorption and photoionization of
Fe^{14+} extending beyond an earlier frame transformation R-matrix
implementation is performed using a fully-correlated, Breit-Pauli R-matrix
formulation including both fine-structure splitting of strongly-bound
resonances and radiation damping. The ... | 1202.4800v1 |
2012-02-29 | Present status of development of damping ring extraction kicker system for CLIC | The CLIC damping rings will produce ultra-low emittance beam, with high bunch
charge, necessary for the luminosity performance of the collider. To limit the
beam emittance blow-up due to oscillations, the pulse power modulators for the
damping ring kickers must provide extremely flat, high-voltage pulses:
specification... | 1202.6527v1 |
2012-04-03 | Inhomogeneity of the phase space of the damped harmonic oscillator under Levy noise | The damped harmonic oscillator under symmetric L\'{e}vy white noise shows
inhomogeneous phase space, which is in contrast to the homogeneous one of the
same oscillator under the Gaussian white noise, as shown in a recent paper [I.
M. Sokolov, W. Ebeling, and B. Dybiec, Phys. Rev. E \textbf{83}, 041118
(2011)]. The inho... | 1204.0593v2 |
2012-06-20 | Metadamping: An emergent phenomenon in dissipative metamaterials | We theoretically demonstrate the concept of metadamping in dissipative
metamaterials. We consider an infinite mass-spring chain with repeated local
resonators and a statically equivalent periodic chain whose wave propagation
characteristics are based on Bragg scattering. For each system we introduce
identical viscous d... | 1206.4577v2 |
2012-07-12 | Spin Damping in an RF Atomic Magnetometer | Under negative feedback, the quality factor Q of a radio-frequency
magnetometer can be decreased by more than two orders of magnitude, so that any
initial perturbation of the polarized spin system can be rapidly damped,
preparing the magnetometer for detection of the desired signal. We find that
noise is also suppresse... | 1207.2842v1 |
2012-07-12 | Damping of phase fluctuations in superfluid Bose gases | Using Popov's hydrodynamic approach we derive an effective Euclidean action
for the long-wavelength phase fluctuations of superfluid Bose gases in D
dimensions. We then use this action to calculate the damping of phase
fluctuations at zero temperature as a function of D. For D >1 and wavevectors |
k | << 2 mc (where m ... | 1207.3002v3 |
2012-08-27 | The properties of non-thermal X-ray filaments in young supernova remnants | Context. Young supernova remnants (SNRs) exhibit narrow filaments of
non-thermal X-ray emission whose widths can be limited either by electron
energy losses or damping of the magnetic field. Aims. We want to investigate
whether or not different models of these filaments can be observationally
tested. Methods. Using obs... | 1208.5322v1 |
2012-09-10 | Mid-infrared plasmons in scaled graphene nanostructures | Plasmonics takes advantage of the collective response of electrons to
electromagnetic waves, enabling dramatic scaling of optical devices beyond the
diffraction limit. Here, we demonstrate the mid-infrared (4 to 15 microns)
plasmons in deeply scaled graphene nanostructures down to 50 nm, more than 100
times smaller tha... | 1209.1984v1 |
2012-11-05 | No asymptotically highly damped quasi-normal modes without horizons? | We explore the question of what happens with the asymptotically highly damped
quasi-normal modes ($\ell$ fixed, $|\omega_{I}|\to\infty$) when the underlying
spacetime has no event horizons. We consider the characteristic oscillations of
a scalar field in a large class of asymptotically flat spherically symmetric
static... | 1211.1046v2 |
2012-11-21 | Chaotic saddles in nonlinear modulational interactions in a plasma | A nonlinear model of modulational processes in the subsonic regime involving
a linearly unstable wave and two linearly damped waves with different damping
rates in a plasma is studied numerically. We compute the maximum Lyapunov
exponent as a function of the damping rates in a two-parameter space, and
identify shrimp-s... | 1211.5070v1 |
2012-12-18 | Thermal activation at moderate-to-high and high damping: finite barrier effects and force spectroscopy | We study the thermal escape problem in the moderate-to-high and high damping
regime of a system with a parabolic barrier. We present a formula that matches
our numerical results accounting for finite barrier effects, and compare it
with previous works. We also show results for the full damping range. We
quantitatively ... | 1212.4290v2 |
2013-01-18 | Interfacial roughening in non-ideal fluids: Dynamic scaling in the weak- and strong-damping regime | Interfacial roughening denotes the nonequilibrium process by which an
initially flat interface reaches its equilibrium state, characterized by the
presence of thermally excited capillary waves. Roughening of fluid interfaces
has been first analyzed by Flekkoy and Rothman [Phys. Rev. Lett. 75, 260
(1995)], where the dyn... | 1301.4468v2 |
2013-02-02 | Achieving the Quantum Ground State of a Mechanical Oscillator using a Bose-Einstein Condensate with Back-Action and Cold Damping feedback schemes | We present a detailed study to show the possibility of approaching the
quantum ground-state of a hybrid optomechanical quantum device formed by a
Bose-Einstein condensate (BEC) confined inside a high-finesse optical cavity
with an oscillatory end mirror. Cooling is achieved using two experimentally
realizable schemes: ... | 1302.0339v1 |
2013-02-27 | Resonantly damped oscillations of elliptically shaped stratified emerging coronal loops | The effects of both elliptical shape and stage of emergence of the coronal
loop on the resonant absorption of standing kink oscillations are studied. To
do so, a typical coronal loop is modeled as a zero-beta longitudinally
stratified cylindrical magnetic flux tube. We developed the connection formulae
for the resonant... | 1302.6884v1 |
2013-02-28 | Damping of Quantum Vibrations Revealed in Deep Sub-barrier Fusion | We demonstrate that when two colliding nuclei approach each other, their
quantum vibrations are damped near the touching point. We show that this
damping is responsible for the fusion hindrance phenomena measured in the deep
sub-barrier fusion reactions. To show those, we for the first time apply the
random-phase-appro... | 1302.7115v2 |
2013-03-14 | Microwave-assisted switching of a nanomagnet: analytical determination of the optimal microwave field | We analytically determine the optimal microwave field that allows for the
magnetization reversal of a nanomagnet modeled as a macrospin. This is done by
minimizing the total injected energy. The results are in good agreement with
the fields obtained numerically using the optimal control theory. For typical
values of th... | 1303.3501v4 |
2013-04-05 | Nonlocal Gravity: Damping of Linearized Gravitational Waves | In nonlocal general relativity, linearized gravitational waves are damped as
they propagate from the source to the receiver in the Minkowski vacuum.
Nonlocal gravity is a generalization of Einstein's theory of gravitation in
which nonlocality is due to the gravitational memory of past events. That
nonlocal gravity is d... | 1304.1769v1 |
2013-07-29 | Damping of Primordial Gravitational Waves from Generalized Sources | It has been shown that a cosmological background with an anisotropic stress
tensor, appropriate for a free streaming thermal neutrino background, can damp
primordial gravitational waves after they enter the horizon, and can thus
affect the CMB B-mode polarization signature due to such tensor modes. Here we
generalize t... | 1307.7571v1 |
2013-08-08 | Small global solutions to the damped two-dimensional Boussinesq equations | The two-dimensional (2D) incompressible Euler equations have been thoroughly
investigated and the resolution of the global (in time) existence and
uniqueness issue is currently in a satisfactory status. In contrast, the global
regularity problem concerning the 2D inviscid Boussinesq equations remains
widely open. In an... | 1308.1723v1 |
2013-08-21 | Approximate quantum error correction for generalized amplitude damping errors | We present analytic estimates of the performances of various approximate
quantum error correction schemes for the generalized amplitude damping (GAD)
qubit channel. Specifically, we consider both stabilizer and nonadditive
quantum codes. The performance of such error-correcting schemes is quantified
by means of the ent... | 1308.4582v2 |
2013-11-01 | Kinetic theory of acoustic-like modes in nonextensive pair plasmas | The low-frequency acoustic-like modes in a pair plasma (electron-positron or
pair-ion) is studied by employing a kinetic theory model based on the Vlasov
and Poisson's equation with emphasizing the Tsallis's nonextensive statistics.
The possibility of the acoustic-like modes and their properties in both fully
symmetric... | 1311.0193v1 |
2013-11-29 | Exploring viscous damping in undergraduate Physics laboratory using electromagnetically coupled oscillators | We design a low-cost, electromagnetically coupled, simple harmonic oscillator
and demonstrate free, damped and forced oscillations in an under-graduate (UG)
Physics laboratory. It consists of a spring-magnet system that can oscillate
inside a cylinder around which copper coils are wound. Such demonstrations can
complim... | 1311.7489v1 |
2013-12-18 | Radiative damping and synchronization in a graphene-based terahertz emitter | We investigate the collective electron dynamics in a recently proposed
graphene-based terahertz emitter under the influence of the radiative damping
effect, which is included self-consistently in a molecular dynamics approach.
We show that under appropriate conditions synchronization of the dynamics of
single electrons... | 1312.5193v1 |
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