publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
|---|---|---|---|
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 |
2007-01-30 | Charge Fluctuation of Dust Grain and Its Impact on Dusty-Acoustic Wave Damping | We consider the influence of dust charge fluctuations on damping of the
dust-ion-acoustic waves. It is assumed that all grains have equal masses but
charges are not constant in time - they may fluctuate in time. The dust charges
are not really independent of the variations in the plasma potentials. All
modes will influ... | 0701336v1 |
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 |
2004-01-28 | Bloch Equations and Completely Positive Maps | The phenomenological dissipation of the Bloch equations is reexamined in the
context of completely positive maps. Such maps occur if the dissipation arises
from a reduction of a unitary evolution of a system coupled to a reservoir. In
such a case the reduced dynamics for the system alone will always yield
completely po... | 0401177v1 |
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 |
2006-01-10 | Quantum Brownian motion and the Third Law of thermodynamics | The quantum thermodynamic behavior of small systems is investigated in
presence of finite quantum dissipation. We consider the archetype cases of a
damped harmonic oscillator and a free quantum Brownian particle. A main finding
is that quantum dissipation helps to ensure the validity of the Third Law. For
the quantum o... | 0601056v1 |
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 |
2007-07-20 | 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 |
2007-08-09 | 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 |
2007-08-26 | Geodesic plasma flows instabilities of Riemann twisted solar loops | Riemann and sectional curvatures of magnetic twisted flux tubes in Riemannian
manifold are computed to investigate the stability of the plasma astrophysical
tubes. The geodesic equations are used to show that in the case of thick
magnetic tubes, the curvature of planar (Frenet torsion-free) tubes have the
effect ct of ... | 0708.3473v1 |
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 |
2008-02-20 | 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 |
2008-05-07 | 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 ($\prop... | 0807.4440v2 |
2008-08-03 | Superradiant Instability of Five-Dimensional Rotating Charged AdS Black Holes | We study the instability of small AdS black holes with two independent
rotation parameters in minimal five-dimensional gauged supergravity to massless
scalar perturbations. We analytically solve the Klein-Gordon equation for
low-frequency perturbations in two regions of the spacetime of these black
holes: namely, in th... | 0808.0280v3 |
2008-08-15 | Collective excitations in two-dimensional antiferromagnet in strong magnetic field | We discuss spin-$\frac12$ two-dimensional (2D) Heisenberg antiferromagnet
(AF) on a square lattice at T=0 in strong magnetic field H near its saturation
value $H_c$. A perturbation approach is proposed to obtain spectrum of magnons
with momenta not very close to AF vector in the leading order in small
parameter $(H_c-H... | 0808.2127v3 |
2008-08-26 | Nonlinear regularization techniques for seismic tomography | The effects of several nonlinear regularization techniques are discussed in
the framework of 3D seismic tomography. Traditional, linear, $\ell_2$ penalties
are compared to so-called sparsity promoting $\ell_1$ and $\ell_0$ penalties,
and a total variation penalty. Which of these algorithms is judged optimal
depends on ... | 0808.3472v3 |
2008-09-09 | Process tomography of field damping and measurement of Fock state lifetimes by quantum non-demolition photon counting in a cavity | The relaxation of a quantum field stored in a high-$Q$ superconducting cavity
is monitored by non-resonant Rydberg atoms. The field, subjected to repetitive
quantum non-demolition (QND) photon counting, undergoes jumps between photon
number states. We select ensembles of field realizations evolving from a given
Fock st... | 0809.1511v1 |
2008-10-01 | Excitation of trapped oscillations in discs around black holes | High-frequency quasi-periodic oscillations detected in the light curves of
black hole candidates can, according to one model, be identified with
hydrodynamic oscillations of the accretion disc. We describe a non-linear
coupling mechanism, suggested by Kato, through which inertial waves trapped in
the inner regions of a... | 0810.0116v1 |
2008-10-09 | Atomistic spin dynamics of the CuMn spin glass alloy | We demonstrate the use of Langevin spin dynamics for studying dynamical
properties of an archetypical spin glass system. Simulations are performed on
CuMn (20% Mn) where we study the relaxation that follows a sudden quench of the
system to the low temperature phase. The system is modeled by a Heisenberg
Hamiltonian whe... | 0810.1645v1 |
2008-10-20 | On the Existence of Exponentially Decreasing Solutions of the Nonlinear Landau Damping Problem | In this paper we prove the existence of a large class of periodic solutions
of the Vlasov-Poisson in one space dimension that decay exponentially as t goes
to infinity. The exponential decay is well known for the linearized version of
the Landau damping problem and it has been proved in [4] for a class of
solutions of ... | 0810.3456v2 |
2008-10-22 | Thermal (in)stability of type I collagen fibrils | We measured Young's modulus at temperatures ranging from 20 to 100 ^{\circ}$C
for a collagen fibril taken from rat's tendon. The hydration change under
heating and the damping decrement were measured as well. At physiological
temperatures $25-45^{\circ}$C Young's modulus decreases, which can be
interpreted as instabili... | 0810.4172v1 |
2008-11-03 | Ion thermal effects in oscillating multi-ion plasma sheath theory | The effects of ion temperature are discussed in a two-ion electron plasma and
for a model applicable to the oscillating sheath theory that has recently been
much in the focus of researchers. The differences between the fluid and kinetic
models have been pointed out, as well as the differences between the
approximative ... | 0811.0251v1 |
2008-12-01 | Self-Diffusion in 2D Dusty Plasma Liquids: Numerical Simulation Results | We perform Brownian dynamics simulations for studying the self-diffusion in
two-dimensional (2D) dusty plasma liquids, in terms of both mean-square
displacement and velocity autocorrelation function (VAF). Super-diffusion of
charged dust particles has been observed to be most significant at infinitely
small damping rat... | 0812.0338v3 |
2008-12-11 | Reduced nonlinear description of Farley-Buneman instability | In the study on nonlinear wave-wave processes in an ionosphere and a
magnetosphere usually the main attention is paid to investigation of plasma
turbulence at well developed stage, when the wide spectrum of plasma wave is
present. On the other side, it is well known that even if the number of
cooperating waves remains ... | 0812.2182v1 |
2008-12-16 | Reconstructing Baryon Oscillations: A Lagrangian Theory Perspective | Recently Eisenstein and collaborators introduced a method to `reconstruct'
the linear power spectrum from a non-linearly evolved galaxy distribution in
order to improve precision in measurements of baryon acoustic oscillations. We
reformulate this method within the Lagrangian picture of structure formation,
to better u... | 0812.2905v3 |
2009-01-28 | Location- and observation time-dependent quantum-tunneling | We investigate quantum tunneling in a translation invariant chain of
particles. The particles interact harmonically with their nearest neighbors,
except for one bond, which is anharmonic. It is described by a symmetric double
well potential. In the first step, we show how the anharmonic coordinate can be
separated from... | 0901.4518v1 |
2009-02-16 | Plasmon excitations in homogeneous neutron star matter | We study the possible collective plasma modes which can affect neutron-star
thermodynamics and different elementary processes in the baryonic density range
between nuclear saturation ($\rho_0$) and $3\rho_0$. In this region, the
expected constituents of neutron-star matter are mainly neutrons, protons,
electrons and mu... | 0902.2552v2 |
2009-02-27 | Monogamy Inequality and Residual Entanglement of Three Qubits under Decoherence | Exploring an analytical expression for the convex roof of the pure state
squared concurrence for rank 2 mixed states the entanglement of a system of
three particles under decoherence is studied, using the monogamy inequality for
mixed states and the residual entanglement obtained from it. The monogamy
inequality is inv... | 0903.0019v2 |
2009-03-12 | X-band crab cavities for the CLIC beam delivery system | The CLIC machine incorporates a 20 mrad crossing angle at the IP to aid the
extraction of spent beams. In order to recover the luminosity lost through the
crossing angle a crab cavity is proposed to rotate the bunches prior to
collision. The crab cavity is chosen to have the same frequency as the main
linac (11.9942 GH... | 0903.2116v1 |
2009-03-16 | Regularity of invariant sets in semilinear damped wave equations | Under fairly general assumptions, we prove that every compact invariant
subset $\mathcal I$ of the semiflow generated by the semilinear damped wave
equation \epsilon u_{tt}+u_t+\beta(x)u-\sum_{ij}(a_{ij}
(x)u_{x_j})_{x_i}&=f(x,u),&& (t,x)\in[0,+\infty[\times\Omega,
u&=0,&&(t,x)\in[0,+\infty[\times\partial\Omega in $H^1... | 0903.2782v1 |
2009-03-20 | Hawking-Unruh radiation as irreversible consequence of radiative action in dynamics | Hawking-Unruh thermal state of warm surrounding field encountered in
non-inertial frames is shown to be a real phenomenon, a marker of nonstationary
dynamic evolutions. In accelerated motion of a charged particle it is shown
that the recoiled damping effect of Larmor radiation relaxation leads to
distinctive thermal po... | 0903.3529v2 |
2009-03-25 | The covering factor of high redshift damped Lyman-$α$ systems | We have used the Very Long Baseline Array to image 18 quasars with foreground
damped Lyman-$\alpha$ systems (DLAs) at 327, 610 or 1420 MHz, to measure the
covering factor $f$ of each DLA at or near its redshifted HI 21cm line
frequency. Including six systems from the literature, we find that none of 24
DLAs at $0.09 < ... | 0903.4483v1 |
2009-04-15 | Size dependent Acoustic Phonon Dynamics of CdTe0.68Se0.32 Nanoparticles in Borosilicate glass | Low frequency acoustic vibration and phonon linewidth for CdTe0.68Se0.32
nanoparticle embedded in borosilicate glass are calculated using two different
approaches by considering the elastic continuum model and fixed boundary
condition. The presence of medium significantly affects the phonon peaks and
results into the b... | 0904.2278v1 |
2009-04-19 | Incorporating Human Body Mass in Standards of Helmet Impact Protection against Traumatic Brain Injury | Impact induced traumatic brain injury (ITBI) describes brain injury from head
impact not necessarily accompanied by skull fracture. For sufficiently abrupt
head impact decelerations, ITBI results from brain tissue stress incurred as
the brain crashes into the inside of the skull wall, displacing the surrounding
cerebra... | 0904.2856v1 |
2009-04-21 | Type II migration of planets on eccentric orbits | The observed extrasolar planets possess both large masses (with a median M
sin i of 1.65 MJ) and a wide range in orbital eccentricity (0 < e < 0.94). As
planets are thought to form in circumstellar disks, one important question in
planet formation is determining whether, and to what degree, a gaseous disk
affects an ec... | 0904.3336v1 |
2009-05-13 | J-transform applied to the detection of Gravitational Waves: preliminary results | We propose to apply to the detection of Gravitational Waves a new method
developed for the spectral analysis of noisy time-series of damped oscillators.
From the Pad\'e Approximations of the time-series Z-transform, a Jacobi
Matrix (J-Matrix) is constructed. We show that the J-Matrix has bound states
with eigenvalues... | 0905.2000v1 |
2009-05-25 | Non-Markovian dynamics of a biased qubit coupled to a structured bath | A new analytical approach, beyond rotating wave approximation, based on
unitary transformations and the non-Markovian master equation for the density
operator, is applied to treat the biased spin boson model with a Lorentzian
structured bath for arbitrary detunings at zero temperature. Compared to zero
bias, we find th... | 0905.3965v3 |
2009-05-28 | A black box method for solving the complex exponentials approximation problem | A common problem, arising in many different applied contexts, consists in
estimating the number of exponentially damped sinusoids whose weighted sum best
fits a finite set of noisy data and in estimating their parameters. Many
different methods exist to this purpose. The best of them are based on
approximate Maximum Li... | 0905.4602v2 |
2009-06-10 | GALEX Discovery of a Damped Ly-alpha System at Redshift z = 1 | We report the first discovery of a QSO damped Ly-alpha (DLA) system by the
GALEX satellite. The system was initially identified as an MgII absorption-line
system (z_abs=1.028) in the spectrum of SDSS QSO J0203-0910 (z_em=1.58). The
presence of unusually strong absorption due to metal lines of ZnII, CrII, MnII,
and FeII... | 0906.2018v1 |
2009-06-11 | Longitudinal Stability of Recycler Bunches; Part I: Thresholds for Loss of Landau Damping | We examine the stability of intense flat bunches in barrier buckets used in
the Recycler. We consider some common stationary distributions and show that
they would be unstable against rigid dipole oscillations. We then discuss an
analytical model for the line density that best describes measured bunch
profiles. We incl... | 0906.2188v1 |
2009-06-15 | Regge poles of the Schwarzschild black hole: a WKB approach | We provide simple and accurate analytical expressions for the Regge poles of
the Schwarzschild black hole. This is achieved by using third-order WKB
approximations to solve the radial wave equations for spins 0, 1 and 2. These
results permit us to obtain analytically the dispersion relation and the
damping of the "surf... | 0906.2601v3 |
2009-06-30 | Cooling a magnetic resonance force microscope via the dynamical back-action of nuclear spins | We analyze the back-action influence of nuclear spins on the motion of the
cantilever of a magnetic force resonance microscope. We calculate the
contribution of nuclear spins to the damping and frequency shift of the
cantilever. We show that, at the Rabi frequency, the energy exchange between
the cantilever and the spi... | 0906.5420v2 |
2009-07-03 | Magnetic interference patterns in long disordered Josephson junctions | We study a diffusive superconductor - normal metal - superconductor (SNS)
junction in an external magnetic field. In the limit of a long junction, we
find that the form of the dependence of the Josephson current on the field and
on the length of the junction depends on the ratio between the junction width
and the lengt... | 0907.0632v3 |
2009-07-12 | Symmetries shape the current in ratchets induced by a bi-harmonic force | Equations describing the evolution of particles, solitons, or localized
structures, driven by a zero-average, periodic, external force, and invariant
under time reversal and a half-period time shift, exhibit a ratchet current
when the driving force breaks these symmetries. The bi-harmonic force
$f(t)=\epsilon_1\cos(q \... | 0907.2029v2 |
2009-07-21 | AFM Dissipation Topography of Soliton Superstructures in Adsorbed Overlayers | In the atomic force microscope, the nanoscale force topography of even
complex surface superstructures is extracted by the changing vibration
frequency of a scanning tip. An alternative dissipation topography with similar
or even better contrast has been demonstrated recently by mapping the
(x,y)-dependent tip damping ... | 0907.3585v4 |
2009-07-24 | Harmonic damped oscillators with feedback. A Langevin study | We consider a system in direct contact with a thermal reservoir and which, if
left unperturbed, is well described by a memory-less equilibrium Langevin
equation of the second order in the time coordinate. In such conditions, the
strength of the noise fluctuations is set by the damping factor, in accordance
with the Flu... | 0907.4309v1 |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.