publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2011-02-02 | Harmonic Oscillator in Heat Bath: Exact simulation of time-lapse-recorded data, exact analytical benchmark statistics | The stochastic dynamics of the damped harmonic oscillator in a heat bath is
simulated with an algorithm that is exact for time steps of arbitrary size.
Exact analytical results are given for correlation functions and power spectra
in the form they acquire when computed from experimental time-lapse recordings.
Three app... | 1102.0524v1 |
2011-02-04 | A symmetry trip from Caldirola to Bateman damped systems | For the Caldirola-Kanai system, describing a quantum damped harmonic
oscillator, a couple of constant-of-motion operators generating the Heisenberg
algebra can be found. The inclusion of the standard time evolution symmetry in
this algebra for damped systems, in a unitary manner, requires a non-trivial
extension of thi... | 1102.0990v1 |
2011-03-03 | Determination of the pairing state in iron-based superconductors through neutron scattering | We calculate the spin susceptibility in the s_{+-} and s_{++} superconducting
states of the iron pnictides using the effective five orbital model and
considering the quasiparticle damping. For the experimentally evaluated
magnitude of the quasiparticle damping and the superconducting gap, the results
at the wave vector... | 1103.0586v2 |
2011-03-03 | Transmission of classical and quantum information through a quantum memory channel with damping | We consider the transfer of classical and quantum information through a
memory amplitude damping channel. Such a quantum channel is modeled as a damped
harmonic oscillator, the interaction between the information carriers - a train
of qubits - and the oscillator being of the Jaynes-Cummings kind. We prove that
this mem... | 1103.0747v2 |
2011-03-08 | Steady states of the parametric rotator and pendulum | We discuss several steady-state rotation and oscillation modes of the planar
parametric rotator and pendulum with damping. We consider a general elliptic
trajectory of the suspension point for both rotator and pendulum, for the
latter at an arbitrary angle with gravity, with linear and circular
trajectories as particul... | 1103.1413v1 |
2011-03-18 | Time-periodic solitons in a damped-driven nonlinear Schrödinger equation | Time-periodic solitons of the parametrically driven damped nonlinear
Schr\"odinger equation are obtained as solutions of the boundary-value problem
on a two-dimensional spatiotemporal domain. We follow the transformation of the
periodic solitons as the strength of the driver is varied. The resulting
bifurcation diagram... | 1103.3604v1 |
2011-03-28 | Motion of position-dependent mass as a damping-antidamping process: Application to the Fermi gas and to the Morse potential | The object of this paper is to investigate, classically and quantum
mechanically, the relation existing between the position-dependent effective
mass and damping-antidamping dynamics. The quantization of the equations of
motion is carried out using the geometric interpretation of the motion, and we
compare it with the ... | 1103.5440v3 |
2011-04-30 | Resonantly Damped Propagating Kink Waves in Longitudinally Stratified Solar Waveguides | It has been shown that resonant absorption is a robust physical mechanism to
explain the observed damping of magnetohydrodynamic (MHD) kink waves in the
solar atmosphere due to naturally occurring plasma inhomogeneity in the
direction transverse to the direction of the magnetic field. Theoretical
studies of this dampin... | 1105.0067v1 |
2011-05-05 | The effect of twisted magnetic field on the resonant absorption of MHD waves in coronal loops | The standing quasi modes in a cylindrical incompressible flux tube with
magnetic twist that undergoes a radial density structuring is considered in
ideal magnetohydrodynamics (MHD). The radial structuring is assumed to be a
linearly varying density profile. Using the relevant connection formulae, the
dispersion relatio... | 1105.1120v1 |
2011-05-05 | Interpreting Graph Cuts as a Max-Product Algorithm | The maximum a posteriori (MAP) configuration of binary variable models with
submodular graph-structured energy functions can be found efficiently and
exactly by graph cuts. Max-product belief propagation (MP) has been shown to be
suboptimal on this class of energy functions by a canonical counterexample
where MP conver... | 1105.1178v1 |
2011-05-14 | Crossovers in the non-Markovian dynamics of two-qubit entanglements | We study the entanglement dynamics of two non-interacting, spatially
separated qubits subject to local environment noises. Based on exactly solvable
models for non-Markovian amplitude damping and phase damping noises, we are
able to analyze the entanglement dynamics of the two qubits for different
coupling bandwidths a... | 1105.2859v2 |
2011-06-17 | Controlling Excitations Inversion of a Cooper Pair Box Interacting with a Nanomechanical Resonator | We investigate the action of time dependent detunings upon the excitation
inversion of a Cooper pair box interacting with a nanomechanical resonator. The
method employs the Jaynes-Cummings model with damping, assuming different decay
rates of the Cooper pair box and various fixed and t-dependent detunings. It is
shown ... | 1106.3379v1 |
2011-06-22 | Tunable Magnonic Frequency and Damping in [Co/Pd]8 Multilayers with Variable Co Layer Thickness | We report the experimental observation of collective picosecond magnetization
dynamics in [Co/Pd]8 multilayers with perpendicular magnetic anisotropy. The
precession frequency shows large and systematic variation from about 5 GHz to
about 90 GHz with the decrease in the Co layer thickness from 1.0 nm to 0.22 nm
due to ... | 1106.4491v1 |
2011-07-04 | An HI column density threshold for cold gas formation in the Galaxy | We report the discovery of a threshold in the HI column density of Galactic
gas clouds below which the formation of the cold phase of HI is inhibited. This
threshold is at $N_{HI} = 2 \times 10^{20}$ per cm$^{2}$; sightlines with lower
HI column densities have high spin temperatures (median $T_s \sim 1800$ K),
indicati... | 1107.0744v2 |
2011-07-11 | One-dimensional vertical dust strings in a glass box | The oscillation spectrum of a one-dimensional vertical dust string formed
inside a glass box on top of the lower electrode in a GEC reference cell was
studied. A mechanism for creating a single vertical dust string is described.
It is shown that the oscillation amplitudes, resonance frequencies, damping
coefficients, a... | 1107.2074v1 |
2011-07-24 | Traveling kinks in cubic nonlinear Ginzburg-Landau equations | Nonlinear cubic Euler-Lagrange equations of motion in the traveling variable
are usually derived from Ginzburg-Landau free energy functionals frequently
encountered in several fields of physics. Many authors considered in the past
damped versions of such equations with the damping term added by hand
simulating the fric... | 1107.4773v4 |
2011-08-22 | On conditions for asymptotic stability of dissipative infinite-dimensional systems with intermittent damping | We study the asymptotic stability of a dissipative evolution in a Hilbert
space subject to intermittent damping. We observe that, even if the
intermittence satisfies a persistent excitation condition, if the Hilbert space
is infinite-dimensional then the system needs not being asymptotically stable
(not even in the wea... | 1108.4327v2 |
2011-08-26 | Aligned Major Axes in a Planetary System without Tidal Evolution: The 61 Virginis example | Tidal damping of one of the orbits in a planetary system can lead to aligned
major-axes (the so-called "fixed-point" condition), but currently aligned major
axes do not necessarily imply such a history. An example is the nominal orbital
solution for the 61 Virginis system where two orbits librate about alignment,
but e... | 1108.5369v1 |
2011-09-09 | Optimal linear optical implementation of a single-qubit damping channel | We experimentally demonstrate a single-qubit decohering quantum channel using
linear optics. We implement the channel, whose special cases include both the
amplitude-damping channel and the bit-flip channel, using a single, static
optical setup. Following a recent theoretical result [M. Piani et al., Phys.
Rev. A, 84, ... | 1109.2070v1 |
2011-11-20 | Detection of picosecond magnetization dynamics of 50 nm magnetic dots down to the single dot regime | We report an all-optical time-domain detection of picosecond magnetization
dynamics of arrays of 50 nm Ni80Fe20 (permalloy) dots down to the single
nanodot regime. In the single nanodot regime the dynamics reveals one dominant
resonant mode corresponding to the edge mode of the 50 nm dot with slightly
higher damping th... | 1111.4625v1 |
2011-12-02 | An energy-based computational method in the analysis of the transmission of energy in a chain of coupled oscillators | In this paper we study the phenomenon of nonlinear supratransmission in a
semi-infinite discrete chain of coupled oscillators described by modified
sine-Gordon equations with constant external and internal damping, and subject
to harmonic external driving at the end. We develop a consistent and
conditionally stable fin... | 1112.0581v1 |
2012-01-09 | Universal response of optimal granular damping devices | Granular damping devices constitute an emerging technology for the
attenuation of vibrations based on the dissipative nature of particle
collisions. We show that the performance of such devices is independent of the
material properties of the particles for working conditions where damping is
optimal. Even the suppressi... | 1201.1866v2 |
2012-01-09 | Radiative energy loss reduction in an absorptive plasma | The influence of the damping of radiation on the radiative energy loss
spectrum of a relativistic charge in an infinite, absorptive plasma is studied.
We find increasing reduction of the spectrum with increasing damping. Our
studies, which represent an Abelian approximation for the colour charge
dynamics in the quark-g... | 1201.1890v1 |
2012-01-10 | Nonequilibrium Damping of Collective Motion of Homogeneous Cold Fermi Condensates with Feshbach Resonances | Collisionless damping of a condensate of cold Fermi atoms, whose scattering
is controlled by a Feshbach resonance, is explored throughout the BCS and BEC
regimes when small perturbations on its phase and amplitude modes are turned on
to drive the system slightly out of equilibrium. Using a one-loop effective
action, we... | 1201.2019v1 |
2012-01-30 | Modeling electricity spot prices using mean-reverting multifractal processes | We discuss stochastic modeling of volatility persistence and
anti-correlations in electricity spot prices, and for this purpose we present
two mean-reverting versions of the multifractal random walk (MRW). In the first
model the anti-correlations are modeled in the same way as in an
Ornstein-Uhlenbeck process, i.e. via... | 1201.6137v1 |
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 |
2012-05-14 | Critical viscoelastic response in jammed solids | We determine the linear viscoelastic response of jammed packings of athermal
repulsive viscous spheres, a model for emulsions, wet foams, and soft colloidal
suspensions. We numerically measure the complex shear modulus, a fundamental
characterization of the response, and demonstrate that low frequency response
displays... | 1205.2960v1 |
2012-06-11 | Testing the 130 GeV gamma-ray line with high energy resolution detectors | Recently some hints of the existence of $\gamma$-ray line around 130 GeV are
reported according to the analysis of Fermi-LAT data. If confirmed it would be
the first direct evidence to show the existence of new physics beyond the
standard model. Here we suggest that using the forthcoming high energy
resolution $\gamma$... | 1206.2241v2 |
2012-06-14 | Finite-temperature dynamics of matter-wave dark solitons in linear and periodic potentials: an example of an anti-damped Josephson junction | We study matter-wave dark solitons in atomic Bose-Einstein condensates at
finite temperatures, under the effect of linear and periodic potentials. Our
model, namely a dissipative Gross-Pitaevskii equation, is treated analytically
by means of dark soliton perturbation theory, which results in a Newtonian
equation of mot... | 1206.2993v1 |
2012-06-15 | Damping of giant dipole resonance in hot rotating nuclei | The phonon damping model (PDM) is extended to include the effect of angular
momentum at finite temperature. The model is applied to the study of damping of
giant dipole resonance (GDR) in hot and noncollectively rotating spherical
nuclei. The numerical results obtained for Mo88 and Sn106 show that the GDR
width increas... | 1206.3361v1 |
2012-06-18 | Sampled-data design for robust control of a single qubit | This paper presents a sampled-data approach for the robust control of a
single qubit (quantum bit). The required robustness is defined using a sliding
mode domain and the control law is designed offline and then utilized online
with a single qubit having bounded uncertainties. Two classes of uncertainties
are considere... | 1206.3897v2 |
2012-06-25 | Trap anharmonicity and sloshing mode of a Fermi gas | For a gas trapped in a harmonic potential, the sloshing (or Kohn) mode is
undamped and its frequency coincides with the trap frequency, independently of
the statistics, interaction and temperature of the gas. However, experimental
trap potentials have usually Gaussian shape and anharmonicity effects appear as
the tempe... | 1206.5688v2 |
2012-09-06 | Radiative energy loss in the absorptive QGP: taming the long formation lengths in coherent emission | In an absorptive plasma, damping of radiation mechanisms can influence the
bremsstrahlung formation in case of large radiation formation lengths. We study
qualitatively the influence of this effect on the gluon bremsstrahlung spectrum
off heavy quarks in the quark-gluon plasma. Independent of the heavy-quark
mass, the ... | 1209.1149v1 |
2012-09-17 | Power spectra in the eikonal approximation with adiabatic and non-adiabatic modes | We use the so-called eikonal approximation, recently introduced in the
context of cosmological perturbation theory, to compute power spectra for
multi-component fluids. We demonstrate that, at any given order in standard
perturbation theory, multipoint power spectra do not depend on the large-scale
adiabatic modes. Mor... | 1209.3662v2 |
2012-09-26 | Linear response theory for hydrodynamic and kinetic equations with long-range interactions | We apply the linear response theory to systems with long-range interactions
described by hydrodynamic equations such as the Euler, Smoluchowski, and damped
Euler equations. We analytically determine the response of the system submitted
to a pulse and to a step function. We compare these results with those obtained
for ... | 1209.5987v1 |
2012-09-15 | Phase mixing of propagating Alfven waves in a stratified atmosphere: Solar spicules | Alfvenic waves are thought to play an important role in coronal heating and
solar wind acceleration. Recent observations by Hinode/SOT showed that the
spicules mostly exhibit upward propagating high frequency waves. Here we
investigate the dissipation of such waves due to phase mixing in stratified
environment of solar... | 1210.0485v1 |
2012-10-03 | Effect of temperature and velocity on superlubricity | We study the effects of temperature and sliding velocity on superlubricity in
numerical simulations of the Frenkel-Kontorova model. We show that resonant
excitations of the phonons in an incommensurate sliding body lead to an
effective friction and to thermal equilibrium with energy distributed over the
internal degree... | 1210.1124v1 |
2012-10-04 | Basic microscopic plasma physics unified and simplified by N-body classical mechanics | Debye shielding, collisional transport, Landau damping of Langmuir waves, and
spontaneous emission of these waves are introduced, in typical plasma physics
textbooks, in different chapters. This paper provides a compact unified
introduction to these phenomena without appealing to fluid or kinetic models,
but by using N... | 1210.1546v2 |
2012-10-11 | Measurement of the damping of nuclear shell effect in the doubly magic $^{208}$Pb region | The damping of the nuclear shell effect with excitation energy has been
measured through an analysis of the neutron spectra following the triton
transfer in the $^7$Li induced reaction on $^{205}$Tl. The measured neutron
spectra demonstrate the expected large shell correction energy for the nuclei
in the vicinity of do... | 1210.3213v2 |
2012-10-16 | Optimal control of laser plasma instabilities using Spike Trains of Uneven Duration and Delay (STUD pulses) for ICF and IFE | An adaptive method of controlling parametric instabilities in laser produced
plasmas is proposed. It involves fast temporal modulation of a laser pulse on
the fastest instability's amplification time scale, adapting to changing and
unknown plasma conditions. These pulses are comprised of on and off sequences
having at ... | 1210.4462v1 |
2012-10-28 | Mass Dependence of Instabilities of an Oscillator with Multiplicative and Additive Noise | We study the instabilities of a harmonic oscillator subject to additive and
dichotomous multiplicative noise, focussing on the dependance of the
instability threshold on the mass. For multiplicative noise in the damping, the
instability threshold is crossed as the mass is decreased, as long as the
smaller damping is in... | 1210.7433v1 |
2012-10-30 | Extending the Concept of Analog Butterworth Filter for Fractional Order Systems | This paper proposes the design of Fractional Order (FO) Butterworth filter in
complex w-plane (w=sq; q being any real number) considering the presence of
under-damped, hyper-damped, ultra-damped poles. This is the first attempt to
design such fractional Butterworth filters in complex w-plane instead of
complex s-plane,... | 1210.8194v3 |
2012-11-24 | Effects of Quantum Error Correction on Entanglement Sudden Death | We investigate the effects of error correction on non-local quantum coherence
as a function of time, extending the study by Sainz and Bj\"ork. We consider
error correction of amplitude damping, pure phase damping and combinations of
amplitude and phase damping as they affect both fidelity and quantum
entanglement. Init... | 1211.5654v2 |
2012-12-04 | Polarization dependence of phonon influences in exciton-biexciton quantum dot systems | We report on a strong dependence of the phonon-induced damping of Rabi
dynamics in an optically driven exciton-biexciton quantum dot system on the
polarization of the exciting pulse. While for a fixed pulse intensity the
damping is maximal for linearly polarized excitation, it decreases with
increasing ellipticity of t... | 1212.0642v1 |
2012-12-10 | Heat-induced damping modification in YIG/Pt hetero-structures | We experimentally demonstrate the manipulation of magnetization relaxation
utilizing a temperature difference across the thickness of an yttrium iron
garnet/platinum (YIG/Pt) hetero-structure: the damping is either increased or
decreased depending on the sign of the temperature gradient. This effect might
be explained ... | 1212.2073v1 |
2012-12-13 | Surface plasmon polaritons in a semi-bounded degenerate plasma: role of spatial dispersion and collisions | Surface plasmon polaritons (SPPs) in a semi-bounded degenerate plasma (e.g.,
a metal) are studied using the quasiclassical mean-field kinetic model, taking
into account the spatial dispersion of the plasma (due to quantum degeneracy of
electrons) and electron-ion (electron-lattice, for metals) collisions. SPP
dispersio... | 1212.3040v1 |
2012-12-13 | Branching of quasinormal modes for nearly extremal Kerr black holes | We show that nearly extremal Kerr black holes have two distinct sets of
quasinormal modes, which we call zero-damping modes (ZDMs) and damped modes
(DMs). The ZDMs exist for all harmonic indices $l$ and $m \ge 0$, and their
frequencies cluster onto the real axis in the extremal limit. The DMs have
nonzero damping for a... | 1212.3271v1 |
2012-12-31 | Effects of lateral device size and material properties on the ferromagnetic resonance response of spinwave eigen-modes in magnetic devices | We analyze the effects of lateral device size and magnetic material
parameters on the ferromagnetic resonance (FMR) response. Results presented are
directly relevant to widely used FMR experimental techniques for extracting
magnetic parameters from thin films, the results of which are often assumed to
carry over to cor... | 1212.6835v1 |
2013-01-16 | Gain-tunable optomechanical cooling in a laser cavity | We study the optical cooling of the resonator mirror in a
cavity-optomechanical system that contains an optical gain medium. We find that
the optical damping rate is vanishingly small for an incoherently pumped laser
above threshold. In the presence of an external coherent drive however, the
optical damping rate can be... | 1301.3762v2 |
2013-01-18 | Adiabatic stability under semi-strong interactions: The weakly damped regime | We rigorously derive multi-pulse interaction laws for the semi-strong
interactions in a family of singularly-perturbed and weakly-damped
reaction-diffusion systems in one space dimension. Most significantly, we show
the existence of a manifold of quasi-steady N-pulse solutions and identify a
"normal-hyperbolicity" cond... | 1301.4466v1 |
2013-01-24 | Spin transport parameters in metallic multilayers determined by ferromagnetic resonance measurements of spin pumping | We measured spin transport in nonferromagnetic (NM) metallic multilayers from
the contribution to damping due to spin pumping from a ferromagnetic Co90Fe10
thin film. The multilayer stack consisted of NM1/NM2/Co90Fe10(2 nm)/NM2/NM3
with varying NM materials and thicknesses. Using conventional theory for one
dimensional... | 1301.5861v1 |
2013-02-11 | Low-damping epsilon-near-zero slabs: nonlinear and nonlocal optical properties | We investigate second harmonic generation, low-threshold multistability,
all-optical switching, and inherently nonlocal effects due to the free-electron
gas pressure in an epsilon-near-zero (ENZ) metamaterial slab made of
cylindrical, plasmonic nanoshells illuminated by TM-polarized light. Damping
compensation in the E... | 1302.2392v1 |
2013-02-14 | A Matlab toolbox for fractional relaxation-oscillation equations | Stress relaxation and oscillation damping of complex viscoelastic media often
manifest history- and path-dependent physical behaviors and cannot accurately
be described by the classical models. Recent research found that fractional
derivative models can characterize such complex relaxation and damping.
However, to our ... | 1302.3384v1 |
2013-03-11 | The Analysis of Long-Term Frequency and Damping Wandering in Buildings Using the Random Decrement Technique | The characterization and monitoring of buildings is an issue that has
attracted the interest of many sectors over the last two decades. With the
increasing use of permanent, continuous and real-time networks, ambient
vibrations can provide a simple tool for the identification of dynamic building
parameters. This study ... | 1303.2642v1 |
2013-03-21 | Optimizing atomic resolution of force microscopy in ambient conditions | Ambient operation poses a challenge to AFM because in contrast to operation
in vacuum or liquid environments, the cantilever dynamics change dramatically
from oscillating in air to oscillating in a hydration layer when probing the
sample. We demonstrate atomic resolution by imaging of the KBr(001) surface in
ambient co... | 1303.5204v2 |
2013-04-10 | Current Sheets and Collisionless Damping in Kinetic Plasma Turbulence | We present the first study of the formation and dissipation of current sheets
at electron scales in a wave-driven, weakly collisional, 3D kinetic turbulence
simulation. We investigate the relative importance of dissipation associated
with collisionless damping via resonant wave-particle interactions versus
dissipation ... | 1304.2958v2 |
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 |
2013-04-23 | Existence and non-existence of breather solutions in damped and driven nonlinear lattices | We investigate the existence of spatially localised solutions, in the form of
discrete breathers, in general damped and driven nonlinear lattice systems of
coupled oscillators. Conditions for the exponential decay of the difference
between the maximal and minimal amplitudes of the oscillators are provided
which proves ... | 1304.6370v3 |
2013-06-21 | Inviscid damping and the asymptotic stability of planar shear flows in the 2D Euler equations | We prove asymptotic stability of shear flows close to the planar Couette flow
in the 2D inviscid Euler equations on $\Torus \times \Real$. That is, given an
initial perturbation of the Couette flow small in a suitable regularity class,
specifically Gevrey space of class smaller than 2, the velocity converges
strongly i... | 1306.5028v3 |
2013-07-12 | Spin injection from topological insulator tunnel-coupled to metallic leads | We study theoretically helical edge states of 2D and 3D topological
insulators (TI) tunnel-coupled to metal leads and show that their transport
properties are strongly affected by contacts as the latter play a role of a
heat bath and induce damping and relaxation of electrons in the helical states
of TI. A simple struc... | 1307.3333v1 |
2013-07-19 | Damping and non-linearity of a levitating magnet in rotation above a superconductor | We study the dissipation of moving magnets in levitation above a
superconductor. The rotation motion is analyzed using optical tracking
techniques. It displays a remarkable regularity together with long damping time
up to several hours. The magnetic contribution to the damping is investigated
in detail by comparing 14 ... | 1307.5155v1 |
2013-07-19 | Perfect squeezing by damping modulation in circuit quantum electrodynamics | Dissipation-driven quantum state engineering uses the environment to steer
the state of quantum systems and preserve quantum coherence in the steady
state. We show that modulating the damping rate of a microwave resonator
generates a vacuum squeezed state of arbitrary squeezing strength, thereby
constituting a mechanis... | 1307.5311v2 |
2013-07-27 | Charge-carrier-induced frequency renormalization, damping and heating of vibrational modes in nanoscale junctions | In nanoscale junctions the interaction between charge carriers and the local
vibrations results in renormalization, damping and heating of the vibrational
modes. We here formulate a nonequilibrium Green's functions based theory to
describe such effects. Studying a generic junction model with an off-resonant
electronic ... | 1307.7288v3 |
2013-07-30 | Phase retrapping in a pointlike $\varphi$ Josephson junction: the Butterfly effect | We consider a $\varphi$ Josephson junction, which has a bistable zero-voltage
state with the stationary phases $\psi=\pm\varphi$. In the non-zero voltage
state the phase "moves" viscously along a tilted periodic double-well
potential. When the tilting is reduced quasistatically, the phase is retrapped
in one of the pot... | 1307.8042v1 |
2013-08-10 | CESR Test Accelerator | The Cornell Electron Storage Ring (CESR) was reconfigured in 2008 as a test
accelerator to investigate the physics of ultra-low emittance damping rings.
During the approximately 40 days/year available for dedicated operation as a
test accelerator, specialized instrumentation is used to measure growth and
mitigation of ... | 1308.2325v1 |
2013-09-09 | Characterization of the International Linear Collider damping ring optics | A method is presented for characterizing the emittance dilution and dynamic
aperture for an arbitrary closed lattice that includes guide field magnet
errors, multipole errors and misalignments. This method, developed and tested
at the Cornell Electron Storage Ring Test Accelerator (CesrTA), has been
applied to the damp... | 1309.2248v3 |
2013-09-19 | Van der Waals Coefficients for the Alkali-metal Atoms in the Material Mediums | The damping coefficients for the alkali atoms are determined very accurately
by taking into account the optical properties of the atoms and three distinct
types of trapping materials such as Au (metal), Si (semi-conductor) and
vitreous SiO2 (dielectric). Dynamic dipole polarizabilities are calculated
precisely for the ... | 1309.4897v1 |
2013-10-13 | What the Timing of Millisecond Pulsars Can Teach us about Their Interior | The cores of compact stars reach the highest densities in nature and
therefore could consist of novel phases of matter. We demonstrate via a
detailed analysis of pulsar evolution that precise pulsar timing data can
constrain the star's composition, through unstable global oscillations
(r-modes) whose damping is determi... | 1310.3524v2 |
2013-11-28 | Conservative effects in spin-transfer-driven magnetization dynamics | It is shown that under appropriate conditions spin-transfer-driven
magnetization dynamics in a single-domain nanomagnet is conservative in nature
and admits a specific integral of motion, which is reduced to the usual
magnetic energy when the spin current goes to zero. The existence of this
conservation law is connecte... | 1311.7344v1 |
2013-12-05 | The initial condition problems of damped quantum harmonic oscillator | We investigate the exact dynamics of the damped quantum harmonic oscillator
under the (un)correlated initial conditions. The master equation is generalized
to the cases of the arbitrary factorized state and/or Gaussian state. We show
that the variances of the factorized Gaussian state do not sensitively depend
on the i... | 1312.1454v1 |
2013-12-13 | Optical variability of quasars: a damped random walk | A damped random walk is a stochastic process, defined by an exponential
covariance matrix that behaves as a random walk for short time scales and
asymptotically achieves a finite variability amplitude at long time scales.
Over the last few years, it has been demonstrated, mostly but not exclusively
using SDSS data, tha... | 1312.3966v1 |
2013-12-25 | Non-linear damping of visco-resistive Alfven waves in solar spicules | Interaction of Alfven waves with plasma inhomogeneities generates phase
mixing which can lead to dissipate Alfven waves and to heat the solar plasma.
Here we study the dissipation of Alfven waves by phase mixing due to viscosity
and resistivity variations with height. We also consider nonlinear
magnetohydrodynamic (MHD... | 1312.7866v1 |
2013-12-31 | A novel variability-based method for quasar selection: evidence for a rest frame ~54 day characteristic timescale | We compare quasar selection techniques based on their optical variability
using data from the Catalina Real-time Transient Survey (CRTS). We introduce a
new technique based on Slepian wavelet variance (SWV) that shows comparable or
better performance to structure functions and damped random walk models but
with fewer a... | 1401.1785v1 |
2014-02-09 | Manipulation of tripartite-to-bipartite entanglement localization under quantum noises and its application to entanglement distribution | This paper is to investigate the effects of quantum noises on entanglement
localization by taking an example of reducing a three-qubit
Greenberger-Horne-Zeilinger (GHZ) state to a two-qubit entangled state. We
consider, respectively, two types of quantum decoherence, i.e.,
amplitude-damping and depolarizing decoherence... | 1402.1914v2 |
2014-02-25 | Thermodynamic anomalies in the presence of dissipation: from the free particle to the harmonic oscillator | A free particle coupled to a heat bath can exhibit a number of thermodynamic
anomalies like a negative specific heat or reentrant classicality. These
low-temperature phenomena are expected to be modified at very low temperatures
where finite-size effects associated with the discreteness of the energy
spectrum become re... | 1402.6221v1 |
2014-02-26 | Magneto-elastic modes and lifetime of magnons in thin yttrium-iron garnet films | We calculate the effects of the spin-lattice coupling on the magnon spectrum
of thin ferromagnetic films consisting of the magnetic insulator yttrium-iron
garnet. The magnon-phonon hybridisation generates a characteristic minimum in
the spin dynamic structure factor which quantitatively agrees with recent
Brillouin lig... | 1402.6575v2 |
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 |
2014-03-10 | Quantum Fisher Information of W States in Decoherence Channels | We study the quantum Fisher information (QFI) of W states analytically with
respect to SU(2) rotations in the basic decoherence channels i.e. depolarizing
(DPC), amplitude damping (ADC) and phase damping (PDC), and present the
interesting behavior of QFI of W states, especially when compared to that of
GHZ states [Ma e... | 1403.2376v1 |
2014-03-14 | Silk damping at a redshift of a billion: a new limit on small-scale adiabatic perturbations | We study the dissipation of small-scale adiabatic perturbations at early
times when the Universe is hotter than T ~ 0.5 keV. When the wavelength falls
below the damping scale 1/kD, the acoustic modes diffuse and thermalize,
causing entropy production. Before neutrino decoupling, kD is primarily set by
the neutrino shea... | 1403.3697v1 |
2014-06-02 | CMB $μ$ distortion from primordial gravitational waves | We propose a new mechanism of generating the $\mu$ distortion in cosmic
microwave background (CMB) originated from primordial gravitational waves. Such
$\mu$ distortion is generated by the damping of the temperature anisotropies
through the Thomson scattering, even on scales larger than that of Silk
damping. This mecha... | 1406.0451v2 |
2014-06-04 | Self-organized escape processes of linear chains in nonlinear potentials | An enhancement of localized nonlinear modes in coupled systems gives rise to
a novel type of escape process. We study a spatially one dimensional set-up
consisting of a linearly coupled oscillator chain of $N$ mass-points situated
in a metastable nonlinear potential. The Hamilton-dynamics exhibits breather
solutions as... | 1406.0938v1 |
2014-06-08 | Dissipation-driven squeezed and sub-Poissonian mechanical states in quadratic optomechanical systems | In this work we study an optomechanical system in which there is a purely
quadratic optomechanical coupling between the optical and mechanical modes. The
optical mode is pumped by three coherent fields and the mechanical mode is
parametrically driven. We show that if the frequencies and amplitudes of both
optical and m... | 1406.1987v3 |
2014-06-13 | Frequency-dependent damping in propagating slow magneto-acoustic waves | Propagating slow magneto-acoustic waves are often observed in polar plumes
and active region fan loops. The observed periodicities of these waves range
from a few minutes to few tens of minutes and their amplitudes were found to
decay rapidly as they travel along the supporting structure. Previously,
thermal conduction... | 1406.3565v1 |
2014-06-24 | On finite density effects on cosmic reheating and moduli decay and implications for Dark Matter production | We study the damping of an oscillating scalar field in a
Friedmann-Robertson-Walker spacetime by perturbative processes, taking into
account the finite density effects that interactions with the plasma of decay
products have on the damping rate. The scalar field may be identified with the
inflaton, in which case this p... | 1406.6243v2 |
2014-08-13 | Probing dense matter in compact star cores with radio pulsar data | Astrophysical observations of compact stars provide, in addition to collider
experiments, the other big source of information on matter under extreme
conditions. The largest and most precise data set about neutron stars is the
timing data of radio pulsars. We show how this unique data can be used to learn
about the ult... | 1408.3152v1 |
2014-08-25 | Spin-Scattering Rates in Metallic Thin Films Measured by Ferromagnetic Resonance Damping Enhanced by Spin-Pumping | We determined the spin-transport properties of Pd and Pt thin films by
measuring the increase in ferromagnetic resonance damping due to spin-pumping
in ferromagnetic (FM)-nonferromagnetic metal (NM) multilayers with varying NM
thicknesses. The increase in damping with NM thickness depends strongly on both
the spin- and... | 1408.5921v2 |
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 |
2014-09-04 | A numerical study of the pull-in instability in some free boundary models for MEMS | In this work we numerically compute the bifurcation curve of stationary
solutions for the free boundary problem for MEMS in one space dimension. It has
a single turning point, as in the case of the small aspect ratio limit. We also
find a threshold for the existence of global-in-time solutions of the evolution
equation... | 1409.1291v2 |
2014-09-15 | Direct path from microscopic mechanics to Debye shielding, Landau damping, and wave-particle interaction | The derivation of Debye shielding and Landau damping from the $N$-body
description of plasmas is performed directly by using Newton's second law for
the $N$-body system. This is done in a few steps with elementary calculations
using standard tools of calculus, and no probabilistic setting. Unexpectedly,
Debye shielding... | 1409.4323v1 |
2014-09-19 | Damping of metallized bilayer nanomechanical resonators at room temperature | We investigate the influence of gold thin-films subsequently deposited on a
set of initially bare, doubly clamped, high-stress silicon nitride string
resonators at room temperature. Analytical expressions for resonance frequency,
quality factor and damping for both in- and out-of-plane flexural modes of the
bilayer sys... | 1409.5670v1 |
2014-10-09 | Non-Fermi-liquid behavior and anomalous suppression of Landau damping in layered metals close to ferromagnetism | We analyse the low-energy physics of nearly ferromagnetic metals in two
spatial dimensions using the functional renormalization group technique. We
find a new low-energy fixed point, at which the fermionic (electron-like)
excitations are non-Fermi-liquid ($z_f = 13/10$) and the magnetic fluctuations
exhibit an anomalou... | 1410.2539v3 |
2014-10-09 | Special mean motion resonance pairs: Mimas-Tethys and Titan-Hyperion | Five pairs of large solar system satellites occupy first order mean-motion
resonances (MMRs). Among these, the pairs of Mimas-Tethys and Titan-Hyperion
are special. They are located much deeper in resonance than the others and
their critical arguments librate with much greater amplitudes. These
characteristics are trac... | 1410.2648v1 |
2014-11-13 | Stability and bifurcation for the Kuramoto model | We study the mean-field limit of the Kuramoto model of globally coupled
oscillators. By studying the evolution in Fourier space and understanding the
domain of dependence, we show a global stability result. Moreover, we can
identify function norms to show damping of the order parameter for velocity
distributions and pe... | 1411.3752v3 |
2014-11-26 | A singular finite element technique for calculating continuum damping of Alfvén eigenmodes | Damping due to continuum resonances can be calculated using dissipation-less
ideal magnetohydrodynamics (MHD) provided that the poles due to these
resonances are properly treated. We describe a singular finite element
technique for calculating the continuum damping of Alfv\'{e}n waves. A
Frobenius expansion is used to ... | 1411.7111v1 |
2014-11-26 | Energy decay for a locally undamped wave equation | We study the decay rate for the energy of solutions of a damped wave equation
in a situation where the Geometric Control Condition is violated. We assume
that the set of undamped trajectories is a flat torus of positive codimension
and that the metric is locally flat around this set. We further assume that the
damping ... | 1411.7271v1 |
2014-12-05 | Entanglement Dynamics of Quantum Oscillators Nonlinearly Coupled to Thermal Environments | We study the asymptotic entanglement of two quantum harmonic oscillators
nonlinearly coupled to an environment. Coupling to independent baths and a
common bath are investigated. Numerical results obtained using the
Wangsness-Bloch-Redfield method are supplemented by analytical results in the
rotating wave approximation... | 1412.1999v1 |
2014-12-08 | The dispersion modification of electrostatic geodesic acoustic mode by electron geodesic drift current | The past studies treated the perturbed distribution of circulating electrons
as adiabatic one when studying the dispersion relation of electrostatic
geodesic acoustic mode(GAM). In this paper, the flow of electron geodesic
current (FEGC) is added to modify this adiabatic distribution. Based on the
drift kinetic theory,... | 1412.2481v1 |
2014-12-10 | Alfvenic Turbulence Beyond the Ambipolar Diffusion Scale | We investigate the nature of the Alfv\'enic turbulence cascade in two fluid
MHD simulations in order to determine if turbulence is damped once the ion and
neutral species become decoupled at a critical scale called the ambipolar
diffusion scale (L$_{AD}$). Using mode decomposition to separate the three
classical MHD mo... | 1412.3452v1 |
2015-01-19 | Linear wave action decay entailed by Landau damping in inhomogeneous, nonstationary and anisotropic plasma | This paper addresses the linear propagation of an electron wave in a
collisionless, inhomogeneous, nonstationary and anisotropic plasma. The plasma
is characterized by its distribution function, $f_H$, at zero order in the wave
amplitude. This distribution function, from which are derived all the
hydrodynamical quantit... | 1501.04485v1 |
2015-01-23 | Response solutions for quasi-periodically forced, dissipative wave equations | We consider several models of nonlinear wave equations subject to very strong
damping and quasi-periodic external forcing. This is a singular perturbation,
since the damping is not the highest order term. We study the existence of
response solutions (i.e., quasi-periodic solutions with the same frequency as
the forcing... | 1501.05979v1 |
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