publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2007-12-19 | Cosmic String Dynamics and Evolution in Warped Spacetime | We study the dynamics and evolution of Nambu-Goto strings in a warped
spacetime, where the warp factor is a function of the internal coordinates
giving rise to a `throat' region. The microscopic equations of motion for
strings in this background include potential and friction terms, which attract
the strings towards th... | 0712.3224v2 |
2007-12-20 | The Critical Exponent of the Fractional Langevin Equation is $α_c\approx 0.402$ | We investigate the dynamical phase diagram of the fractional Langevin
equation and show that critical exponents mark dynamical transitions in the
behavior of the system. For a free and harmonically bound particle the critical
exponent $\alpha_c= 0.402\pm 0.002$ marks a transition to a non-monotonic
under-damped phase. ... | 0712.3407v1 |
2008-01-24 | Particle Acceleration by Fast Modes in Solar Flares | We address the problem of particle acceleration in solar flares by fast modes
which may be excited during the reconnection and undergo cascade and are
subjected to damping. We extend the calculations beyond quasilinear
approximation and compare the acceleration and scattering by transit time
damping and gyroresonance i... | 0801.3786v2 |
2008-02-07 | Analysis of squeal noise and mode coupling instabilities including damping and gyroscopic effects | This paper deals with an audible disturbance known as automotive clutch
squeal noise from the viewpoint of friction-induced mode coupling instability.
Firstly, an auto-coupling model is presented showing a non-conservative
circulatory effect originating from friction forces. Secondly, the stability of
an equilibrium is... | 0802.0923v1 |
2008-02-12 | Nonlinear Saturation of g-modes in Proto-Neutron Stars: Quieting the Acoustic Engine | According to Burrows et al.'s acoustic mechanism for core-collapse supernova
explosions, the primary, l=1, g-mode in the core of the proto-neutron star is
excited to an energy of ~ 10^{50} ergs and damps by the emission of sound
waves. Here we calculate the damping of the primary mode by the parametric
instability, i.e... | 0802.1522v3 |
2008-02-21 | Gas Damping Coefficient Research for MEMS Comb Linear Vibration Gyroscope | Silicon-MEMS gyroscope is an important part of MEMS (Micro Electrical
Mechanical System). There are some disturb ignored in traditional gyroscope
that must be evaluated newly because of its smaller size (reach the level of
micron). In these disturb, the air pressure largely influences the performance
of MEMS gyroscope.... | 0802.3048v1 |
2008-03-03 | Damped harmonic oscillator interpretation of the soft-state power spectra of Cyg X-1 | We develop a model of an accretion disc in which the variability induced at a
given radius is governed by a damped harmonic oscillator at the corresponding
epicyclic frequency. That variability induces both linear and non-linear
responses in the locally emitted radiation. The total observed variability of a
source is t... | 0803.0238v2 |
2008-03-05 | The Secular Evolution of a Close Ring-Satellite System: The Excitation of Spiral Density Waves at a Nearby Gap Edge | The Lagrange planetary equations are used to study to secular evolution of a
small, eccentric satellite that orbits within a narrow gap in a broad,
self-gravitating planetary ring. These equations show that the satellite's
secular perturbations of the ring will excite a very long-wavelength spiral
density wave that pro... | 0803.0576v1 |
2008-03-06 | Hypersound damping in vitreous silica measured by picosecond acoustics | The attenuation of longitudinal acoustic phonons up to frequencies nearing
250 GHz is measured in vitreous silica with a picosecond optical technique.
Taking advantage of interferences on the probe beam, difficulties encountered
in early pioneering experiments are alleviated. Sound damping at 250 GHz and
room temperatu... | 0803.0832v1 |
2008-03-07 | Resonance distribution in open quantum chaotic systems | In order to study the resonance spectra of chaotic cavities subject to some
damping (which can be due to absorption or partial reflection at the
boundaries), we use a model of damped quantum maps. In the high-frequency
limit, the distribution of (quantum) decay rates is shown to cluster near a
``typical'' value, which ... | 0803.1075v4 |
2008-04-03 | Single flux quantum circuits with damping based on dissipative transmission lines | We propose and demonstrate the functioning of a special Rapid Single Flux
Quantum (RSFQ) circuit with frequency-dependent damping. This damping is
achieved by shunting individual Josephson junctions by pieces of open-ended RC
transmission lines. Our circuit includes a toggle flip-flop cell, Josephson
transmission lines... | 0804.0442v1 |
2008-05-14 | Reconciling results of LSND, MiniBooNE and other experiments with soft decoherence | We propose an explanation of the LSND signal via quantum-decoherence of the
mass states, which leads to damping of the interference terms in the
oscillation probabilities. The decoherence parameters as well as their energy
dependence are chosen in such a way that the damping affects only oscillations
with the large (at... | 0805.2098v1 |
2008-06-02 | Observations of Solar Doppler Shift Oscillations with the EUV Imaging Spectrometer on Hinode | Damped Doppler shift oscillations have been observed in emission lines from
ions formed at flare temperatures with the Solar Ultraviolet Measurements of
Emitted Radiation spectrometer on the Solar and Heliospheric Observatory and
with the Bragg Crystal Spectrometer on Yohkoh. This Letter reports the
detection of low-am... | 0806.0265v1 |
2008-07-07 | Using squeezed field to preserve two-atom entanglement against spontaneous emissions | Tunable interaction between two atoms in a cavity is realized by interacting
the two atoms with an extra controllable single-mode squeezed field. Such a
controllable interaction can be further used to control entanglement between
the two atoms against amplitude damping decoherence caused by spontaneous
emissions. For t... | 0807.0965v2 |
2008-07-17 | Connecting high-redshift galaxy populations through observations of local Damped Lyman Alpha dwarf galaxies | I report on observations of the z=0.01 dwarf galaxy SBS1543+593 which is
projected onto the background QSO HS1543+5921. As a star-forming galaxy first
noted in emission, this dwarf is playing a pivotal role in our understanding of
high-redshift galaxy populations, because it also gives rise to a Damped Lyman
Alpha syst... | 0807.2853v1 |
2008-07-26 | A Monte Carlo Method for Modeling Thermal Damping: Beyond the Brownian-Motion Master Equation | The "standard" Brownian motion master equation, used to describe thermal
damping, is not completely positive, and does not admit a Monte Carlo method,
important in numerical simulations. To eliminate both these problems one must
add a term that generates additional position diffusion. He we show that one
can obtain a c... | 0807.4211v3 |
2008-07-31 | Finite-dimensional attractors for the quasi-linear strongly-damped wave equation | We present a new method of investigating the so-called quasi-linear strongly
damped wave equations $$ \partial_t^2u-\gamma\partial_t\Delta_x u-\Delta_x
u+f(u)= \nabla_x\cdot \phi'(\nabla_x u)+g $$ in bounded 3D domains. This method
allows us to establish the existence and uniqueness of energy solutions in the
case wher... | 0807.5078v1 |
2008-08-01 | Field-Driven Domain-Wall Dynamics in GaMnAs Films with Perpendicular Anisotropy | We combine magneto-optical imaging and a magnetic field pulse technique to
study domain wall dynamics in a ferromagnetic (Ga,Mn)As layer with
perpendicular easy axis. Contrary to ultrathin metallic layers, the depinning
field is found to be smaller than the Walker field, thereby allowing for the
observation of the stea... | 0808.0119v1 |
2008-08-11 | Effect of frequency and temperature on microwave-induced magnetoresistance oscillations in two-dimensional electron systems | Experimental results on microwave-induced magnetoresistance oscillation in
two-dimensional electron systems show a similar behavior of these systems
regarding temperature and microwave frequency. It is found that these
oscillations tend to quench when frequency or temperature increase, approaching
magnetoresistance to ... | 0808.1489v1 |
2008-09-26 | Damping and magnetic anisotropy of ferromagnetic GaMnAs thin films | The magnetic properties of annealed, epitaxial Ga0.93Mn0.07As layers under
tensile and compressive stress have been investigated by X-band (9GHz) and
Q-band (35GHz) ferromagnetic resonance (FMR) spectroscopy. From the analysis of
the linewidths of the uniform mode spectra the FMR Gilbert damping factor
"alpha" has been... | 0809.4644v2 |
2008-11-13 | Higher order energy decay rates for damped wave equations with variable coefficients | Under appropriate assumptions the energy of wave equations with damping and
variable coefficients $c(x)u_{tt}-\hbox{div}(b(x)\nabla u)+a(x)u_t =h(x)$ has
been shown to decay. Determining the rate of decay for the higher order
energies involving the $k$th order spatial and time derivatives has been an
open problem with ... | 0811.2159v1 |
2009-01-12 | Nonlinear Wigner solid transport over superfluid helium under AC conditions | Nonlinear transport properties of the two-dimensional Wigner solid of surface
electrons on superfluid helium are studied for alternating current conditions.
For time-averaged quantities like Fourier coefficients, the field-velocity
characteristics are shown to be qualitatively different as compared to that
found in the... | 0901.1508v1 |
2009-01-14 | Brownian motion with respect to time-changing Riemannian metrics, applications to Ricci flow | We generalize Brownian motion on a Riemannian manifold to the case of a
family of metrics which depends on time. Such questions are natural for
equations like the heat equation with respect to time dependent Laplacians
(inhomogeneous diffusions). In this paper we are in particular interested in
the Ricci flow which pro... | 0901.1999v2 |
2009-01-26 | Damping of sound waves in superfluid nucleon-hyperon matter of neutron stars | We consider sound waves in superfluid nucleon-hyperon matter of massive
neutron-star cores. We calculate and analyze the speeds of sound modes and
their damping times due to the shear viscosity and non-equilibrium weak
processes of particle transformations. For that, we employ the dissipative
relativistic hydrodynamics... | 0901.4108v1 |
2009-03-02 | Attenuation and damping of electromagnetic fields: Influence of inertia and displacement current | New results for attenuation and damping of electromagnetic fields in rigid
conducting media are derived under the conjugate influence of inertia due to
charge carriers and displacement current. Inertial effects are described by a
relaxation time for the current density in the realm of an extended Ohm's law.
The classic... | 0903.0210v1 |
2009-04-06 | Scrutinizing single-qubit quantum channels: Theory and experiment with trapped ions | We report experimental implementation of various types of qubit channels
using an individual trapped ion. We analyzed experimental data and we performed
tomographic reconstruction of quantum channels based on these data.
Specifically, we studied phase damping channels, where the damping acts either
in the xy-plane of t... | 0904.0923v1 |
2009-05-13 | Time-dependent barrier passage of Two-dimensional non-Ohmic damping system | The time-dependent barrier passage of an anomalous damping system is studied
via the generalized Langevin equation (GLE) with non-Ohmic memory damping
friction tensor and corresponding thermal colored noise tensor describing a
particle passing over the saddle point of a two-dimensional quadratic potential
energy surfac... | 0905.2074v1 |
2009-06-04 | Viscous cavity damping of a microlever in a simple fluid | We consider the problem of oscillation damping in air of a thermally actuated
microlever as it is gradually approached towards an infinite wall in parallel
geometry. As the gap is decreased from 20 nm down to 400 nm, we observe the
increasing damping of the lever Brownian motion in the fluid laminar regime.
This manife... | 0906.0782v1 |
2009-06-19 | Wakefield damping for the CLIC crab cavity | A crab cavity is required in the CLIC to allow effective head-on collision of
bunches at the IP. A high operating frequency is preferred as the deflection
voltage required for a given rotation angle and the RF phase tolerance for a
crab cavity are inversely proportional to the operating frequency. The short
bunch spaci... | 0906.3593v1 |
2009-07-06 | Non-Fermi liquid behavior due to U(1) gauge field in two dimensions | We study the damping rate of massless Dirac fermions due to the U(1) gauge
field in (2+1)-dimensional quantum electrodynamics. In the absence of a Maxwell
term for the gauge field, the fermion damping rate
$\mathrm{Im}\Sigma(\omega,T)$ is found to diverge in both perturbative and
self-consistent results. In the presenc... | 0907.1022v3 |
2009-07-30 | Gas damping force noise on a macroscopic test body in an infinite gas reservoir | We present a simple analysis of the force noise associated with the
mechanical damping of the motion of a test body surrounded by a large volume of
rarefied gas. The calculation is performed considering the momentum imparted by
inelastic collisions against the sides of a cubic test mass, and for other
geometries for wh... | 0907.5375v2 |
2009-08-26 | Influence of an external magnetic field on forced turbulence in a swirling flow of liquid metal | We report an experimental investigation on the influence of an external
magnetic field on forced 3D turbulence of liquid gallium in a closed vessel. We
observe an exponential damping of the turbulent velocity fluctuations as a
function of the interaction parameter N (ratio of Lorentz force over inertial
terms of the Na... | 0908.3821v1 |
2009-09-30 | Electronic damping of molecular motion at metal surfaces | A method for the calculation of the damping rate due to electron-hole pair
excitation for atomic and molecular motion at metal surfaces is presented. The
theoretical basis is provided by Time Dependent Density Functional Theory
(TDDFT) in the quasi-static limit and calculations are performed within a
standard plane-wav... | 0909.5495v1 |
2009-10-27 | On the Interpretation of Magnetic Helicity Signatures in the Dissipation Range of Solar Wind Turbulence | Measurements of small-scale turbulent fluctuations in the solar wind find a
non-zero right-handed magnetic helicity. This has been interpreted as evidence
for ion cyclotron damping. However, theoretical and empirical evidence suggests
that the majority of the energy in solar wind turbulence resides in low
frequency ani... | 0910.5023v1 |
2009-12-08 | Coupling Photosphere and Corona: Linear and Turbulent Regimes | In a recent work Grappin et al. [1] have shown that low- frequency movements
can be transmitted from one footpoint to the other along a magnetic loop, thus
mimicking a friction effect of the corona on the photosphere, and invalidating
the line-tying approximation. We consider here successively the effect of high
freque... | 0912.1497v1 |
2009-12-16 | The role of $r$-mode damping in the thermal evolution of neutron stars | The thermal evolution of neutron stars (NSs) is investigated by coupling with
the evolution of $\textit{r}$-mode instability that is described by a second
order model.The heating effect due to shear viscous damping of the
$\textit{r}$-modes enables us to understand the high temperature of two young
pulsars (i.e., PSR B... | 0912.3052v1 |
2009-12-25 | Noisy non-transitive quantum games | We study the effect of quantum noise in 3 by 3 entangled quantum games. By
considering different noisy quantum channels we analyze that how a two-player,
three-strategy Rock-Scissor-Paper game is influenced by the quantum noise. We
consider the winning non-transitive strategies R, S and P such as R beats S, S
beats P, ... | 0912.4961v1 |
2010-01-26 | Damping in high-frequency metallic nanomechanical resonators | We have studied damping in polycrystalline Al nanomechanical resonators by
measuring the temperature dependence of their resonance frequency and quality
factor over a temperature range of 0.1 - 4 K. Two regimes are clearly
distinguished with a crossover temperature of 1 K. Below 1 K we observe a
logarithmic temperature... | 1001.4612v1 |
2010-04-28 | Inviscid dynamical structures near Couette flow | Consider inviscid fluids in a channel {-1<y<1}. For the Couette flow
v_0=(y,0), the vertical velocity of solutions to the linearized Euler equation
at v_0 decays in time. At the nonlinear level, such inviscid damping has not
been proved. First, we show that in any (vorticity) H^{s}(s<(3/2)) neighborhood
of Couette flow... | 1004.5149v1 |
2010-06-14 | Parallel electric field amplification by phase-mixing of Alfven waves | Previous numerical studies have identified "phase mixing" of low-frequency
Alfven waves as a mean of parallel electric field amplification and
acceleration of electrons in a collisionless plasma. Theoretical explanations
are given of how this produces an amplification of the parallel electric field,
and as a consequenc... | 1006.2729v1 |
2010-07-19 | Anomalously large damping of long-wavelength quasiparticles caused by long-range interaction | We demonstrate that long-range interaction in a system can lead to a very
strong interaction between long-wavelength quasiparticles and make them heavily
damped. In particular, we discuss magnon spectrum using 1/S expansion in 3D
Heisenberg ferromagnet (FM) with arbitrary small dipolar forces at T<<T_C. We
obtain that ... | 1007.3081v2 |
2010-07-29 | The Quasinormal Mode Spectrum of a Kerr Black Hole in the Eikonal Limit | It is well established that the response of a black hole to a generic
perturbation is characterized by a spectrum of damped resonances, called
quasinormal modes; and that, in the limit of large angular momentum ($l \gg
1$), the quasinormal mode frequency spectrum is related to the properties of
unstable null orbits. In... | 1007.5097v1 |
2010-08-30 | Caldeira-Leggett Model, Landau Damping, and the Vlasov-Poisson System | The Caldeira-Leggett Hamiltonian (Eq. (1) below) describes the interaction of
a discrete harmonic oscillator with a continuous bath of harmonic oscillators.
This system is a standard model of dissipation in macroscopic low temperature
physics, and has applications to superconductors, quantum computing, and
macroscopic ... | 1008.5190v1 |
2010-09-09 | A number-conserving linear response study of low-velocity ion stopping in a collisional magnetized classical plasma | The results of a theoretical investigation on the low-velocity stopping power
of the ions moving in a magnetized collisional plasma are presented. The
stopping power for an ion is calculated employing linear response theory using
the dielectric function approach. The collisions, which leads to a damping of
the excitati... | 1009.1700v1 |
2010-10-03 | A High Phase Advance Damped and Detuned Structure for the Main Linacs of Clic | The main accelerating structures for the CLIC are designed to operate at an
average accelerating gradient of 100 MV/m. The accelerating frequency has been
optimised to 11.994 GHz with a phase advance of 2{\pi}/3 of the main
accelerating mode. The moderately damped and detuned structure (DDS) design is
being studied as ... | 1010.0438v1 |
2010-10-23 | Environmental influences on Quantum Monty Hall problem | We reformulate the quantum Monty Hall problem in the presence of decoherence.
The decoherence destroys the fairness of the game. A new Nash equilibrium for a
particular strategy profile in the presence of decoherence emerges. It is shown
that in the presence of decoherence under the action of amplitude damping
channel,... | 1010.4875v2 |
2010-12-14 | Controlling transfer of quantum correlations among bi-partitions of a composite quantum system by combining noisy environments | The correlation dynamics is investigated for various bi-partitions of a
composite system consisting of two qubits, and two independent and
non-identical noisy environments. The two qubits have no direct interaction
with each other and locally interact with their environments. Classical and
quantum correlations includin... | 1012.3033v1 |
2010-12-22 | Viscous damping of r-modes: Small amplitude instability | We study the viscous damping of r-modes of compact stars and analyze in
detail the regions where small amplitude modes are unstable to the emission of
gravitational radiation. We present general expressions for the viscous damping
times for arbitrary forms of interacting dense matter and derive general
semi-analytic re... | 1012.4883v2 |
2010-12-25 | Screw-pitch effect and velocity oscillation of domain-wall in ferromagnetic nanowire driven by spin-polarized current | We investigate the dynamics of domain wall in ferromagnetic nanowire with
spin-transfer torque. The critical current condition is obtained analytically.
Below the critical current, we get the static domain wall solution which shows
that the spin-polarized current can't drive domain wall moving continuously. In
this cas... | 1012.5473v1 |
2010-12-27 | Phenomenology of Current-Induced Dynamics in Antiferromagnets | We derive a phenomenological theory of current-induced staggered
magnetization dynamics in antiferromagnets. The theory captures the reactive
and dissipative current-induced torques and the conventional effects of
magnetic fields and damping. A Walker ansatz describes the dc current-induced
domain-wall motion when ther... | 1012.5655v2 |
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 |
2011-03-03 | 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 |
2011-03-18 | 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 |
2011-04-08 | Magnetization Dissipation in Ferromagnets from Scattering Theory | The magnetization dynamics of ferromagnets are often formulated in terms of
the Landau-Lifshitz-Gilbert (LLG) equation. The reactive part of this equation
describes the response of the magnetization in terms of effective fields,
whereas the dissipative part is parameterized by the Gilbert damping tensor. We
formulate a... | 1104.1625v1 |
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 |
2011-06-22 | 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 |
2011-08-22 | 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 |
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 |
2012-05-14 | 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 |
2012-11-15 | Spin transport and tunable Gilbert damping in a single-molecule magnet junction | We study time-dependent electronic and spin transport through an electronic
level connected to two leads and coupled with a single-molecule magnet via
exchange interaction. The molecular spin is treated as a classical variable and
precesses around an external magnetic field. We derive expressions for charge
and spin cu... | 1211.3611v2 |
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 |
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