publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
|---|---|---|---|
2003-03-21 | Global well-posedness and multi-tone solutions of a class of nonlinear nonlocal cochlear models in hearing | We study a class of nonlinear nonlocal cochlear models of the transmission
line type, describing the motion of basilar membrane (BM) in the cochlea. They
are damped dispersive partial differential equations (PDEs) driven by time
dependent boundary forcing due to the input sounds. The global well-posedness
in time follo... | 0303048v1 |
2004-05-11 | Analytical approach to soliton ratchets in asymmetric potentials | We use soliton perturbation theory and collective coordinate ansatz to
investigate the mechanism of soliton ratchets in a driven and damped asymmetric
double sine-Gordon equation. We show that, at the second order of the
perturbation scheme, the soliton internal vibrations can couple {\it
effectively}, in presence of d... | 0405023v1 |
2005-02-16 | Controlling soliton explosions | We investigate the dynamics of solitons in generalized Klein-Gordon equations
in the presence of nonlinear damping and spatiotemporal perturbations. We will
present different mechanisms for soliton explosions. We show (both analytically
and numerically) that some space-dependent perturbations or nonlinear damping
can m... | 0502033v1 |
2005-07-22 | Global existence in infinite lattices of nonlinear oscillators: The Discrete Klein-Gordon equation | Pointing out the difference between the Discrete Nonlinear Schr\"odinger
equation with the classical power law nonlinearity-for which solutions exist
globally, independently of the sign and the degree of the nonlinearity, the
size of the initial data and the dimension of the lattice-we prove either
global existence or ... | 0507044v5 |
1992-12-14 | Poisson and Porter-Thomas Fluctuations in off-Yrast Rotational Transitions | Fluctuations associated with stretched E2 transitions from high spin levels
in nuclei around $^{168}$Yb are investigated by a cranked shell model extended
to include residual two-body interactions. It is found that the gamma-ray
energies behave like random variables and the energy spectra show the Poisson
fluctuation, ... | 9212006v1 |
1993-11-25 | Microscopic analysis of two-body correlations in light nuclei | Within a nonperturbative dynamical two-body approach - based on coupled
equations of motion for the one-body density matrix and the two-body
correlation function - we study the distribution of occupation numbers in a
correlated system close to the groundstate, the relaxation of single-particle
excitations and the dampi... | 9311031v1 |
1997-03-26 | A self-consistent treatment of damped motion for stable and unstable collective modes | We address the dynamics of damped collective modes in terms of first and
second moments. The modes are introduced in a self-consistent fashion with the
help of a suitable application of linear response theory. Quantum effects in
the fluctuations are governed by diffusion coefficients D_{\mu\nu}. The latter
are obtained... | 9703056v1 |
1997-04-24 | A Simple Mode on a Highly Excited Background: Collective Strength and Damping in the Continuum | Simple states, such as isobaric analog states or giant resonances, embedded
into continuum are typical for mesoscopic many-body quantum systems. Due to the
coupling to compound states in the same energy range, a simple mode acquires a
damping width ("internal" dynamics). When studied experimentally with the aid
of vari... | 9704055v1 |
1998-10-12 | Response function beyond mean field of neutron-rich nuclei | The damping of single-particle and collective motion in exotic isotopes is a
new topic and its study may shed light on basic problems of nuclear dynamics.
For instance, it is known that nuclear structure calculations are not able, as
a rule, to account completely for the empirical single-particle damping. In
this contr... | 9810033v1 |
1999-04-14 | Scaling Analysis of Fluctuating Strength Function | We propose a new method to analyze fluctuations in the strength function
phenomena in highly excited nuclei. Extending the method of multifractal
analysis to the cases where the strength fluctuations do not obey power scaling
laws, we introduce a new measure of fluctuation, called the local scaling
dimension, which cha... | 9904037v1 |
1999-07-07 | Pair creation: back-reactions and damping | We solve the quantum Vlasov equation for fermions and bosons, incorporating
spontaneous pair creation in the presence of back-reactions and collisions.
Pair creation is initiated by an external impulse field and the source term is
non-Markovian. A simultaneous solution of Maxwell's equation in the presence of
feedback ... | 9907027v1 |
2000-10-23 | Barrier penetration and rotational damping of thermally excited superdeformed nuclei | We construct a microscopic model of thermally excited superdeformed states
that describes both the barrier penetration mechanism, leading to the decay-out
transitions to normal deformed states, and the rotational damping causing
fragmentation of rotational E2 transitions. We describe the barrier penetration
by means of... | 0010074v1 |
1996-02-22 | Stability of Travelling Waves for a Damped Hyperbolic Equation | We consider a nonlinear damped hyperbolic equation in $\real^n$, $1 \le n \le
4$, depending on a positive parameter $\epsilon$. If we set $\epsilon=0$, this
equation reduces to the well-known Kolmogorov-Petrovski-Piskunov equation. We
remark that, after a change of variables, this hyperbolic equation has the same
famil... | 9602004v1 |
1998-09-18 | Stability of Propagating Fronts in Damped Hyperbolic Equations | We consider the damped hyperbolic equation in one space dimension $\epsilon
u_{tt} + u_t = u_{xx} + F(u)$, where $\epsilon$ is a positive, not necessarily
small parameter. We assume that $F(0)=F(1)=0$ and that $F$ is concave on the
interval $[0,1]$. Under these assumptions, our equation has a continuous family
of monot... | 9809007v1 |
1999-05-28 | Existence threshold for the ac-driven damped nonlinear Schrödinger solitons | It has been known for some time that solitons of the externally driven,
damped nonlinear Schr\"odinger equation can only exist if the driver's
strength, $h$, exceeds approximately $(2/ \pi) \gamma$, where $\gamma$ is the
dissipation coefficient. Although this perturbative result was expected to be
correct only to the l... | 9906001v1 |
1996-10-01 | Exact time evolution and master equations for the damped harmonic oscillator | Using the exact path integral solution for the damped harmonic oscillator it
is shown that in general there does not exist an exact dissipative Liouville
operator describing the dynamics of the oscillator for arbitrary initial bath
preparations. Exact non-stationary Liouville operators can be found only for
particular ... | 9610001v1 |
1999-01-09 | Cluster ionization via two-plasmon excitation | We calculate the two-photon ionization of clusters for photon energies near
the surface plasmon resonance. The results are expressed in terms of the
ionization rate of a double plasmon excitation, which is calculated
perturbatively. For the conditions of the experiment by Schlipper et al., we
find an ionization rate of... | 9901008v1 |
2000-08-01 | Rectangular Waveguide HOM Couplers for a TESLA Superstructure | Some modifications of a Rectangular Waveguide HOM couplers for TESLA
superstructure have been investigated. These RWG HOM couplers are to be
installed between the cavities of the superstructure and also at the both ends
of it. We investigated a RWG HOM coupler attached to the beam pipe through the
slots orientated alon... | 0008001v1 |
2000-08-17 | Superconducting Superstructure for the TESLA Collider: New Results | A new cavity-chain layout has been proposed for the main linac of the TESLA
linear collider. This superstructure-layout is based upon four 7-cell
superconducting standing-wave cavities, coupled by short beam pipes. The main
advantages of the superstructure are an increase in the active accelerating
length in TESLA and ... | 0008104v1 |
2000-08-20 | An Investigation of Optimised Frequency Distributions for Damping Wakefields in X-Band Linacs for the NLC | In the NLC (Next Linear Collider) small misalignments in each of the
individual accelerator structures (or the accelerator cells) will give rise to
wakefields which kick the beam from its electrical axis. This wakefield can
cause BBU (Beam Break Up) or at the very least it will dilute the emittance of
the beam. Several... | 0008202v2 |
2001-04-14 | Parameters for a 30 GeV Undulator Test Facility in the FFTB/LCLS | The parameters for a 30 GeV test beam are outlined for use with an undulator
in the FFTB tunnel where the LCLS will eventually be housed. It is proposed to
use the SLAC linac and damping rings in their present mode of operation for PEP
II injection, where 30 GeV beams are also delivered at 10 Hz to the FFTB. High
peak ... | 0104045v1 |
2001-10-05 | Characterization of a Low Frequency Power Spectral Density f^(-gamma) in a Threshold Model | his study investigates the modifications of the thermal spectrum, at low
frequency, induced by an external damping on a system in heat contact with
internal fluctuating impurities. Those impurities can move among locations and
their oscillations are associated with a loss function depending on the model.
The fluctuatio... | 0110019v1 |
2002-05-13 | Damping of electromagnetic waves in low-collision electron-ion plasmas | Using previously developed method of two-dimensional Laplace transform we
obtain the characteristic equations k(\omega) for electromagnetic waves in
low-collision fully ionized plasma of a plane geometry. We apply here a new,
different from the one used in our previous paper, iteration procedure of
taking into account ... | 0205035v2 |
2002-06-01 | Intrabeam scattering analysis of measurements at KEK's ATF damping ring | We derive a simple relation for estimating the relative emittance growth in x
and y due to intrabeam scattering (IBS) in electron storage rings. We show that
IBS calculations for the ATF damping ring, when using the formalism of
Bjorken-Mtingwa, a modified formalism of Piwinski (where eta squared divided by
beta has be... | 0206003v1 |
2002-08-24 | Wakefield Band Partitioning In Linac Structures | In the NLC project multiple bunches of electrons and positrons will be
accelerated initially to a centre of mass of 500 GeV and later to 1 TeV or
more. In the process of accelerating 192 bunches within a pulse train,
wakefields are excited which kick the trailing bunches off axis and can cause
luminosity dilution and B... | 0208086v1 |
2003-01-30 | Calculation of the Coherent Synchrotron Radiation Impedance from a Wiggler | Most studies of Coherent Synchrotron Radiation (CSR) have only considered the
radiation from independent dipole magnets. However, in the damping rings of
future linear colliders, a large fraction of the radiation power will be
emitted in damping wigglers. In this paper, the longitudinal wakefield and
impedance due to C... | 0301073v1 |
2003-10-02 | Damping factors for the gap-tooth scheme | An important class of problems exhibits macroscopically smooth behaviour in
space and time, while only a microscopic evolution law is known. For such
time-dependent multi-scale problems, the gap-tooth scheme has recently been
proposed. The scheme approximates the evolution of an unavailable (in closed
form) macroscopic... | 0310014v1 |
2004-07-31 | Propagation of optical excitations by dipolar interactions in metal nanoparticle chains | Dispersion relations for dipolar modes propagating along a chain of metal
nanoparticles are calculated by solving the full Maxwell equations, including
radiation damping. The nanoparticles are treated as point dipoles, which means
the results are valid only for a/d <= 1/3, where a is the particle radius and d
the spaci... | 0408003v2 |
2004-08-22 | Tacoma Bridge Failure-- a Physical Model | The cause of the collapse of the Tacoma Narrows Bridge has been a topic of
much debate and confusion since the day it fell. Many mischaracterizations of
the observed phenomena have limited the widespread understanding of the
problem. Nevertheless, there has always been an abundance of evidence in favour
of a negative d... | 0408101v1 |
2004-08-30 | Short waves and cyclotron losses in the relativistic gyrokinetic theory | Radiation damping of the motion of charged particles in relativistic,
optically thin plasmas is described within the framework of the covariant
gyrokinetic theory. It involves description of the collisionless
single-particle dynamics as well as the Vlasov and Maxwell equations both
written in the covariant formulation.... | 0408128v1 |
2004-11-05 | Wave-kinetic description of nonlinear photons | The nonlinear interaction, due to quantum electrodynamical (QED) effects,
between photons is investigated using a wave-kinetic description. Starting from
a coherent wave description, we use the Wigner transform technique to obtain a
set of wave-kinetic equations, the so called Wigner-Moyal equations. These
equations ar... | 0411058v1 |
2004-12-17 | Optimal Determination of the Equilibrium Displacement of a Damped Harmonic Oscillator in the Presence of Thermal Noise | Using a matched filter technique, we derive the minimum variance, unbiased
estimator for the equilibrium displacement of a damped harmonic oscillator in
thermal equilibrium when interactions with the thermal bath are the leading
source of noise. We compare the variance in this optimal estimator with the
variance in oth... | 0412102v1 |
2006-01-13 | Atomic collider into dual-isotope magneto-optical trap | When two of three pairs of the Gaussian laser beams of a traditional MOT are
misaligned in the racetrack configuration the effective coordinate-dependent
vortex force do arise. Then an atom is accelerated by this vortex force until
its velocity not balanced by the damping force. This situation may produce a
stable ring... | 0601097v1 |
2006-12-07 | On some peculiarities of electric field pulse propagation in electron Maxwellian plasma and its back response | In the spirit of continued study of general plasma wave properties we
investigated the boundary problem with the simplest form of electric field
pulse at the edge x=0 of half-infinite uniform plasma slab with Maxwellian
electron distribution function. In the case of longitudinal electric field
pulse its traveling veloc... | 0612064v4 |
1996-10-29 | Bosonic Quantum Codes for Amplitude Damping | Traditional quantum error correction involves the redundant encoding of k
quantum bits using n quantum bits to allow the detection and correction of any
t bit error. The smallest general t=1 code requires n=5 for k=1. However, the
dominant error process in a physical system is often well known, thus inviting
the questi... | 9610043v1 |
1997-01-16 | Cooperative loss and decoherence in quantum computation and commuication | Cooperative effects in the loss (the amplitude damping) and decoherence (the
phase damping) of the qubits (two-state quantum systems) due to the inevitable
coupling to the same environment are investigated. It is found that the qubits
undergo the dissipation coherently in this case. In particular, for a special
kind of... | 9701020v1 |
1997-03-22 | Preserving coherence in quantum computation by pairing quantum bits | A scheme is proposed for protecting quantum states from both independent
decoherence and cooperative decoherence. The scheme operates by pairing each
qubit (two-state quantum system) with an ancilla qubit and by encoding the
states of the qubits into the corresponding coherence-preserving states of the
qubit-pairs. In ... | 9703040v2 |
1997-06-10 | Perturbative expansions for the fidelities and spatially correlated dissipation of quantum bits | We construct generally applicable short-time perturbative expansions for some
fidelities, such as the input-output fidelity, the entanglement fidelity, and
the average fidelity. Successive terms of these expansions yield characteristic
times for the damping of the fidelities involving successive powers of the
Hamiltoni... | 9706020v2 |
1998-05-27 | Measurement Process In a Two-Barrier System | The description of a measuring process, such as that which occurs when a
quantum point contact (QPC) detector is influenced by a nearby external
electron which can take up two possible positions, provides a interesting
application of the method of quantum damping. We find a number of new effects,
due to the complete tr... | 9805081v2 |
1998-10-06 | Cumulant expansion for studying damped quantum solitons | The quantum statistics of damped optical solitons is studied using
cumulant-expansion techniques. The effect of absorption is described in terms
of ordinary Markovian relaxation theory, by coupling the optical field to a
continuum of reservoir modes. After introduction of local bosonic field
operators and spatial discr... | 9810018v3 |
1999-02-10 | Quantum noise in the position measurement of a cavity mirror undergoing Brownian motion | We perform a quantum theoretical calculation of the noise power spectrum for
a phase measurement of the light output from a coherently driven optical cavity
with a freely moving rear mirror. We examine how the noise resulting from the
quantum back action appears among the various contributions from other noise
sources.... | 9902040v1 |
1999-10-05 | Uncertainty, entropy and decoherence of the damped harmonic oscillator in the Lindblad theory of open quantum systems | In the framework of the Lindblad theory for open quantum systems, expressions
for the density operator, von Neumann entropy and effective temperature of the
damped harmonic oscillator are obtained. The entropy for a state characterized
by a Wigner distribution function which is Gaussian in form is found to depend
only ... | 9910019v1 |
2000-06-07 | Phenomenological approach to introduce damping effects on radiation field states | In this work we propose an approach to deal with radiation field states which
incorporates damping effects at zero temperature. By using some well known
results on dissipation of a cavity field state, obtained by standard ab-initio
methods, it was possible to infer through a phenomenological way the explicit
form for t... | 0006035v2 |
2001-09-28 | Decoherence in trapped ions due to polarization of the residual background gas | We investigate the mechanism of damping and heating of trapped ions
associated with the polarization of the residual background gas induced by the
oscillating ions themselves. Reasoning by analogy with the physics of surface
electrons in liquid helium, we demonstrate that the decay of Rabi oscillations
observed in expe... | 0109156v1 |
2002-06-18 | Five Lectures On Dissipative Master Equations | 1 First Lecture: Basics
1.1 Physical Derivation of the Master Equation
1.2 Some Simple Implications
1.3 Steady State
1.4 Action to the Left
2 Second Lecture: Eigenvalues and Eigenvectors of L
2.1 A Simple Case First
2.2 The General Case
3 Third Lecture: Completeness of the Damping Bases
3.1 Phase Spac... | 0206116v1 |
2002-10-02 | Radiation damping and decoherence in quantum electrodynamics | The processes of radiation damping and decoherence in Quantum Electrodynamics
are studied from an open system's point of view. Employing functional
techniques of field theory, the degrees of freedom of the radiation field are
eliminated to obtain the influence phase functional which describes the reduced
dynamics of th... | 0210013v1 |
2003-01-08 | Dissipation, Emergent Quantization and Quantum Fluctuations | We review some aspects of the quantization of the damped harmonic oscillator.
We derive the exact action for a damped mechanical system in the frame of the
path integral formulation of the quantum Brownian motion problem developed by
Schwinger and by Feynman and Vernon. The doubling of the phase-space degrees of
freedo... | 0301031v1 |
2004-02-12 | Non-Markovian Quantum Trajectories Versus Master Equations: Finite Temperature Heat Bath | The interrelationship between the non-Markovian stochastic Schr\"odinger
equations and the corresponding non-Markovian master equations is investigated
in the finite temperature regimes. We show that the general finite temperature
non-Markovian trajectories can be used to derive the corresponding
non-Markovian master e... | 0402086v2 |
2005-04-27 | Decoherence models and their effects on quantum maps and algorithms | In this work we study several models of decoherence and how different quantum
maps and algorithms react when perturbed by them. Following closely Ref. [1],
generalizations of the three paradigmatic one single qubit quantum channels
(these are the depolarizing channel, the phase damping channel and the
amplitude damping... | 0504211v1 |
2005-09-22 | Semiclassical quantization of non-Hamiltonian dynamical systems without memory | We propose a new method of quantization of a wide class of dynamical systems
that originates directly from the equations of motion. The method is based on
the correspondence between the classical and the quantum Poisson brackets,
postulated by Dirac. This correspondence applied to open (non-Hamiltonian)
systems allows ... | 0509159v1 |
2005-11-15 | Classical Phase Space Density for the Relativistic Hydrogen Atom | Quantum mechanics is considered to arise from an underlying classical
structure (``hidden variable theory'', ``sub-quantum mechanics''), where
quantum fluctuations follow from a physical noise mechanism. The stability of
the hydrogen ground state can then arise from a balance between Lorentz damping
and energy absorpti... | 0511144v1 |
2006-03-13 | Decoherence induced by a phase-damping reservoir | A phase damping reservoir composed by $N$-bosons coupled to a system of
interest through a cross-Kerr interaction is proposed and its effects on
quantum superpo sitions are investigated. By means of analytical calculations
we show that: i-) the reservoir induces a Gaussian decay of quantum coherences,
and ii-) the inhe... | 0603109v2 |
2007-01-21 | Casimir-Polder forces on excited atoms in the strong atom-field coupling regime | Based on macroscopic quantum electrodynamics in linear media, we develop a
general theory of the resonant Casimir-Polder force on an excited two-level
atom in the presence of arbitrary linear bodies, with special emphasis on the
strong-coupling regime where reabsorption of an emitted photon can give rise to
(vacuum) Ra... | 0701151v2 |
2007-02-07 | Protecting an optical qubit against photon loss | We consider quantum error-correction codes for multimode bosonic systems,
such as optical fields, that are affected by amplitude damping. Such a process
is a generalization of an erasure channel. We demonstrate that the most
accessible method of transforming optical systems with the help of passive
linear networks has ... | 0702075v1 |
1995-02-03 | Shock waves in the dissipative Toda lattice | We consider the propagation of a shock wave (SW) in the damped Toda lattice.
The SW is a moving boundary between two semi-infinite lattice domains with
different densities. A steadily moving SW may exist if the damping in the
lattice is represented by an ``inner'' friction, which is a discrete analog of
the second visc... | 9502001v1 |
2007-04-04 | An integral field spectroscopic survey for high redshift damped Lyman-alpha galaxies | We search for galaxy counterparts to damped Lyman-alpha absorbers (DLAs) at
z>2 towards nine quasars, which have 14 DLAs and 8 sub-DLAs in their spectra.
We use integral field spectroscopy to search for Ly-alpha emission line objects
at the redshifts of the absorption systems. Besides recovering two previously
confirme... | 0704.0654v1 |
2007-04-06 | 9.7 micrometer Silicate Absorption in a Damped Lyman-alpha Absorber at z=0.52 | We report a detection of the 9.7 micrometer silicate absorption feature in a
damped Lyman-alpha (DLA) system at z_{abs} = 0.524 toward AO0235+164, using the
Infrared Spectrograph (IRS) onboard the Spitzer Space Telescope. The feature
shows a broad shallow profile over about 8-12 micrometers in the absorber rest
frame a... | 0704.0826v2 |
2007-04-17 | Boolean network model predicts cell cycle sequence of fission yeast | A Boolean network model of the cell-cycle regulatory network of fission yeast
(Schizosaccharomyces Pombe) is constructed solely on the basis of the known
biochemical interaction topology. Simulating the model in the computer,
faithfully reproduces the known sequence of regulatory activity patterns along
the cell cycle ... | 0704.2200v1 |
2007-05-08 | Optical dilution and feedback cooling of a gram-scale oscillator to 6.9 mK | We report on use of a radiation pressure induced restoring force, the optical
spring effect, to optically dilute the mechanical damping of a 1 gram suspended
mirror, which is then cooled by active feedback (cold damping). Optical
dilution relaxes the limit on cooling imposed by mechanical losses, allowing
the oscillato... | 0705.1018v2 |
2007-05-14 | Electron-muon heat conduction in neutron star cores via the exchange of transverse plasmons | We calculate the thermal conductivity of electrons and muons kappa_{e-mu}
produced owing to electromagnetic interactions of charged particles in neutron
star cores and show that these interactions are dominated by the exchange of
transverse plasmons (via the Landau damping of these plasmons in
nonsuperconducting matter... | 0705.1963v1 |
2007-05-24 | Measurement of Newtonian fluid slip using a torsional ultrasonic oscillator | The composite torsional ultrasonic oscillator, a versatile experimental
system, can be used to investigate slip of Newtonian fluid at a smooth surface.
A rigorous analysis of slip-dependent damping for the oscillator is presented.
Initially, the phenomenon of finite surface slip and the slip length are
considered for a... | 0705.3498v3 |
2007-06-05 | Waves and instabilities in dissipative rotating superfluid neutron stars | We discuss wave propagation in rotating superfluid neutron star cores, taking
into account the vortex mediated mutual friction force. For models where the
two fluids co-rotate in the unperturbed state, our analysis clarifies the role
of chemical coupling and entrainment for sound and inertial waves. We also
investigate... | 0706.0672v1 |
2007-06-28 | Coherent Magnetization Precession in GaMnAs induced by Ultrafast Optical Excitation | We use femtosecond optical pulses to induce, control and monitor
magnetization precession in ferromagnetic Ga0.965Mn0.035As. At temperatures
below ~40 K we observe coherent oscillations of the local Mn spins, triggered
by an ultrafast photoinduced reorientation of the in-plane easy axis. The
amplitude saturation of the... | 0706.4270v2 |
2007-07-20 | Dissipation-Scale Turbulence in the Solar Wind | We present a cascade model for turbulence in weakly collisional plasmas that
follows the nonlinear cascade of energy from the large scales of driving in the
MHD regime to the small scales of the kinetic Alfven wave regime where the
turbulence is dissipated by kinetic processes. Steady-state solutions of the
model for t... | 0707.3149v1 |
2007-08-03 | Strong spin-orbit induced Gilbert damping and g-shift in iron-platinum nanoparticles | The shape of ferromagnetic resonance spectra of highly dispersed, chemically
disordered Fe_{0.2}Pt_{0.8} nanospheres is perfectly described by the solution
of the Landau-Lifshitz-Gilbert (LLG) equation excluding effects by crystalline
anisotropy and superparamagnetic fluctuations. Upon decreasing temperature, the
LLG d... | 0708.0463v1 |
2007-08-09 | An algorithm for detecting oscillatory behavior in discretized data: the damped-oscillator oscillator detector | We present a simple algorithm for detecting oscillatory behavior in discrete
data. The data is used as an input driving force acting on a set of simulated
damped oscillators. By monitoring the energy of the simulated oscillators, we
can detect oscillatory behavior in data. In application to in vivo deep brain
basal gan... | 0708.1341v1 |
2007-08-22 | The dynamics of vortex generation in superfluid 3He-B | A profound change occurs in the stability of quantized vortices in externally
applied flow of superfluid 3He-B at temperatures ~ 0.6 Tc, owing to the rapidly
decreasing damping in vortex motion with decreasing temperature. At low damping
an evolving vortex may become unstable and generate a new independent vortex
loop.... | 0708.3003v2 |
2007-09-05 | Phonon bottleneck in the low-excitation limit | The phonon-bottleneck problem in the relaxation of two-level systems (spins)
via direct phonon processes is considered numerically in the weak-excitation
limit where the Schroedinger equation for the spin-phonon system simplifies.
The solution for the relaxing spin excitation p(t), emitted phonons n_k(t),
etc. is obtai... | 0709.0556v1 |
2007-09-13 | Distribution of PageRank Mass Among Principle Components of the Web | We study the PageRank mass of principal components in a bow-tie Web Graph, as
a function of the damping factor c. Using a singular perturbation approach, we
show that the PageRank share of IN and SCC components remains high even for
very large values of the damping factor, in spite of the fact that it drops to
zero whe... | 0709.2016v1 |
2007-10-02 | Oscillating Starless Cores: The Nonlinear Regime | In a previous paper, we modeled the oscillations of a thermally-supported
(Bonnor-Ebert) sphere as non-radial, linear perturbations following a standard
analysis developed for stellar pulsations. The predicted column density
variations and molecular spectral line profiles are similar to those observed
in the Bok globul... | 0710.0625v1 |
2007-10-08 | Jet quenching parameter \hat q in the stochastic QCD vacuum with Landau damping | We argue that the radiative energy loss of a parton traversing the
quark-gluon plasma is determined by Landau damping of soft modes in the plasma.
Using this idea, we calculate the jet quenching parameter of a gluon. The
calculation is done in SU(3) quenched QCD within the stochastic vacuum model.
At the LHC-relevant t... | 0710.1540v2 |
2007-11-07 | Tuning the effective coupling of an AFM lever to a thermal bath | Fabrication of Nano-Electro-Mechanical-Systems (NEMS) of high quality is
nowadays extremely efficient. These NEMS will be used as sensors and actuators
in integrated systems. Their use however raises questions about their interface
(actuation, detection, read out) with external detection and control systems.
Their oper... | 0711.1024v1 |
2007-12-11 | Neutrino oscillations in a stochastic model for space-time foam | We study decoherence models for flavour oscillations in four-dimensional
stochastically fluctuating space times and discuss briefly the sensitivity of
current neutrino experiments to such models. We pay emphasis on demonstrating
the model dependence of the associated decoherence-induced damping coefficients
in front of... | 0712.1779v1 |
2008-01-21 | Collective cyclotron motion of the relativistic plasma in graphene | We present a theory of the finite temperature thermo-electric response
functions of graphene, in the hydrodynamic regime induced by electron-electron
collisions. In moderate magnetic fields, the Dirac particles undergo a
collective cyclotron motion with a temperature-dependent relativistic cyclotron
frequency proportio... | 0801.2970v3 |
2008-01-25 | Sound waves and solitons in hot and dense nuclear matter | Assuming that nuclear matter can be treated as a perfect fluid, we study the
propagation of perturbations in the baryon density. The equation of state is
derived from a relativistic mean field model, which is a variant of the
non-linear Walecka model. The expansion of the Euler and continuity equations
of relativistic ... | 0801.3938v1 |
2008-01-28 | Qualitative Analysis of Forced Response of Blisks With Friction Ring Dampers | A damping strategy for blisks (integrally bladed disks) of turbomachinery
involving a friction ring is investigated. These rings, located in grooves
underside the wheel of the blisks, are held in contact by centrifugal loads and
the energy is dissipated when relative motions between the ring and the disk
occur. A repre... | 0801.4350v1 |
2008-01-29 | Long Term Evolution of Magnetic Turbulence in Relativistic Collisionless Shocks | We study the long term evolution of magnetic fields generated by an initially
unmagnetized collisionless relativistic $e^+e^-$ shock. Our 2D particle-in-cell
numerical simulations show that downstream of such a Weibel-mediated shock,
particle distributions are approximately isotropic, relativistic Maxwellians,
and the ... | 0801.4583v1 |
2008-02-14 | Light-induced magnetization precession in GaMnAs | We report dynamics of the transient polar Kerr rotation (KR) and of the
transient reflectivity induced by femtosecond laser pulses in ferromagnetic
(Ga,Mn)As with no external magnetic field applied. It is shown that the
measured KR signal consist of several different contributions, among which only
the oscillatory sign... | 0802.2043v2 |
2008-02-20 | Mechanical mode dependence of bolometric back-action in an AFM microlever | Two back action (BA) processes generated by an optical cavity based detection
device can deeply transform the dynamical behavior of an AFM microlever: the
photothermal force or the radiation pressure. Whereas noise damping or
amplifying depends on optical cavity response for radiation pressure BA, we
present experiment... | 0802.2763v2 |
2008-02-21 | Propagation of cosmic rays in the foam-like Universe | The model of a classical spacetime foam is considered, which consists of
static wormholes embedded in Minkowski spacetime. We examine the propagation of
particles in such a medium and demonstrate that a single thin ray undergoes a
specific damping in the density of particles depending on the traversed path
and the dist... | 0802.3109v2 |
2008-02-21 | Damping by slow relaxing rare earth impurities in Ni80Fe20 | Doping NiFe by heavy rare earth atoms alters the magnetic relaxation
properties of this material drastically. We show that this effect can be well
explained by the slow relaxing impurity mechanism. This process is a
consequence of the anisotropy of the on site exchange interaction between the
4f magnetic moments and th... | 0802.3206v3 |
2008-03-11 | Domain wall motion of magnetic nanowires under a static field | The propagation of a head-to-head magnetic domain-wall (DW) or a tail-to-tail
DW in a magnetic nanowire under a static field along the wire axis is studied.
Relationship between the DW velocity and DW structure is obtained from the
energy consideration. The role of the energy dissipation in the field-driven DW
motion i... | 0803.1531v1 |
2008-03-11 | Equation of state for strongly interacting matter: collective effects, Landau damping and predictions for LHC | The equation of state (EOS) is of utmost importance for the description of
the hydrodynamic phase of strongly interacting matter in relativistic heavy-ion
collisions. Lattice QCD can provide useful information on the EOS, mainly for
small net baryon densities. The QCD quasiparticle model provides a means to map
lattice... | 0803.1571v1 |
2008-04-04 | Spin-charge coupling in a band ferromagnet: magnon-energy reduction, anomalous softening, and damping | The effects of correlation-induced coupling between spin and charge
fluctuations on spin-wave excitations in a band ferromagnet are investigated by
including self-energy and vertex corrections within a systematic
inverse-degeneracy expansion scheme which explicitly preserves the Goldstone
mode. Arising from the scatter... | 0804.0680v1 |
2008-05-01 | Chaotic Spin Dynamics of a Long Nanomagnet Driven by a Current | We study the spin dynamics of a long nanomagnet driven by an electrical
current. In the case of only DC current, the spin dynamics has a sophisticated
bifurcation diagram of attractors. One type of attractors is a weak chaos. On
the other hand, in the case of only AC current, the spin dynamics has a rather
simple bifur... | 0805.0147v1 |
2008-05-07 | Noise Analysis and Noise-based Optimization for Resonant MEMS Structures | This paper presents a detailed noise analysis and a noise-based optimization
procedure for resonant MEMS structures. A design for high sensitivity of MEMS
structures needs to take into account the noise shaping induced by damping
phenomena at micro scale. The existing literature presents detailed models for
the damping... | 0805.0927v1 |
2008-05-07 | Scaling crossovers in activated escape of nonequilibrium systems: a resonantly driven oscillator | The rate of metastable decay in nonequilibrium systems is expected to display
scaling behavior: i.e., the logarithm of the decay rate should scale as a power
of the distance to a bifurcation point where the metastable state disappears.
Recently such behavior was observed and some of the earlier predicted exponents
were... | 0805.0972v2 |
2008-05-07 | Quantum Noise, Effective Temperature, and Damping in a Superconducting Single-Electron Transistor | We have directly measured the quantum noise of a superconducting
single-electron transistor (S-SET) embedded in a microwave resonator consisting
of a superconducting LC tank circuit. Using an effective bath description, we
find that the S-SET provides damping of the resonator modes proportional to its
differential cond... | 0805.1037v1 |
2008-05-08 | Adaptive Affinity Propagation Clustering | Affinity propagation clustering (AP) has two limitations: it is hard to know
what value of parameter 'preference' can yield an optimal clustering solution,
and oscillations cannot be eliminated automatically if occur. The adaptive AP
method is proposed to overcome these limitations, including adaptive scanning
of prefe... | 0805.1096v1 |
2008-06-06 | On the stability of shocks with particle pressure | We perform a linear stability analysis for corrugations of a Newtonian shock,
with particle pressure included, for an arbitrary diffusion coefficient. We
study first the dispersion relation for homogeneous media, showing that,
besides the conventional pressure waves and entropy/vorticity disturbances, two
new perturbat... | 0806.1113v1 |
2008-06-17 | Damping of Fast Magnetohydrodynamic Oscillations in Quiescent Filament Threads | High-resolution observations provide evidence about the existence of
small-amplitude transverse oscillations in solar filament fine structures.
These oscillations are believed to represent fast magnetohydrodynamic (MHD)
waves and the disturbances are seen to be damped in short timescales of the
order of 1 to 4 periods.... | 0806.2728v1 |
2008-06-27 | Global attractor and asymptotic smoothing effects for the weakly damped cubic Schrödinger equation in $L^2(\T)$ | We prove that the weakly damped cubic Schr\"odinger flow in $L^2(\T)$
provides a dynamical system that possesses a global attractor. The proof relies
on a sharp study of the behavior of the associated flow-map with respect to the
weak $ L^2(\T) $-convergence inspired by a previous work of the author.
Combining the comp... | 0806.4578v3 |
2008-06-30 | Thermal depinning of fluxons in discrete Josephson rings | We study the thermal depinning of single fluxons in rings made of Josephson
junctions. Due to thermal fluctuations a fluxon can be excited from its energy
minima and move through the array, causing a voltage across each junction. We
find that for the initial depinning, the fluxon behaves as a single particle
and follow... | 0806.4828v1 |
2008-07-03 | Dependence of the decoherence of polarization states in phase-damping channels on the frequency spectrum envelope of photons | We consider the decoherence of photons suffering in phase-damping channels.
By exploring the evolutions of single-photon polarization states and two-photon
polarization-entangled states, we find that different frequency spectrum
envelopes of photons induce different decoherence processes. A white frequency
spectrum can... | 0807.0536v3 |
2008-07-17 | Planetary Migration in Resonance, the question of the Eccentricities : Les Houches contribution | The formation of resonant planets pairs in exoplanetary systems involves
planetary migration inside the protoplanetary disc : an inwards migrating outer
planet captures in Mean Motion Resonance an inner planet. During the migration
of the resonant pair of planets, the eccentricities are expected to rise
excessively, if... | 0807.2828v2 |
2008-07-18 | Heavily Damped Motion of One-Dimensional Bose Gases in an Optical Lattice | We study the dynamics of strongly correlated one-dimensional Bose gases in a
combined harmonic and optical lattice potential subjected to sudden
displacement of the confining potential. Using the time-evolving block
decimation method, we perform a first-principles quantum many-body simulation
of the experiment of Ferti... | 0807.2898v2 |
2008-07-21 | Mutual friction in a cold color flavor locked superfluid and r-mode instabilities in compact stars | Dissipative processes acting in rotating neutron stars are essential in
preventing the growth of the r-mode instability. We estimate the damping time
of r-modes of an hypothetical compact quark star made up by color flavor locked
quark matter at a temperature $T \lesssim 0.01$ MeV. The dissipation that we
consider is d... | 0807.3264v2 |
2008-07-23 | Dynamical Backaction of Microwave Fields on a Nanomechanical Oscillator | We measure the response and thermal motion of a high-Q nanomechanical
oscillator coupled to a superconducting microwave cavity in the
resolved-sideband regime where the oscillator's resonance frequency exceeds the
cavity's linewidth. The coupling between the microwave field and mechanical
motion is strong enough for ra... | 0807.3585v3 |
2008-07-28 | Shear Viscosity of the outer crust of Neutron stars: Ion Contribution | The shear viscosity of the crust might have a damping effect on the amplitude
of r-modes of rotating neutron stars. This damping has implications for the
emission of gravitational waves. We calculate the contribution to the shear
viscosity coming from the ions using both semi-analytical methods, that
consider binary co... | 0807.4353v2 |
2008-07-28 | Unusual decoherence in qubit measurements with a Bose-Einstein condensate | We consider an electrostatic qubit located near a Bose-Einstein condensate
(BEC) of noninteracting bosons in a double-well potential, which is used for
qubit measurements. Tracing out the BEC variables we obtain a simple analytical
expression for the qubit's density-matrix. The qubit's evolution exhibits a
slow ($\prop... | 0807.4440v2 |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.