publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2022-07-01 | Particle acceleration and radiation reaction in a strongly magnetized rotating dipole | Abridged. Neutron stars are surrounded by ultra-relativistic particles
efficiently accelerated by ultra strong electromagnetic fields. However so far,
no numerical simulations were able to handle such extreme regimes of very high
Lorentz factors and magnetic field strengths. It is the purpose of this paper
to study par... | 2207.00624v1 |
2022-07-04 | Selectivity of Protein Interactions Stimulated by Terahertz Signals | It has been established that Terahertz (THz) band signals can interact with
biomolecules through resonant modes. Specifically, of interest here, protein
activation. Our research goal is to show how directing the mechanical signaling
inside protein molecules using THz signals can control changes in their
structure and a... | 2207.01572v1 |
2022-07-10 | Revealing the drag instability in one-fluid nonideal MHD simulations of a 1D isothermal C-shock | C-type shocks are believed to be ubiquitous in turbulent molecular clouds
thanks to ambipolar diffusion. We investigate whether the drag instability in
1D isothermal C-shocks, inferred from the local linear theory of Gu & Chen, can
appear in non-ideal magnetohydrodynamic simulations. Two C-shock models (with
narrow and... | 2207.04355v2 |
2022-08-10 | Theoretical model of a new type tunneling transistor | A tunneling transistor without heterojunction as a theoretical design, or
more precisely controlled electron current transmission by barrier potential,
is under consideration.
The electrons from the conduction band of the source tunnel through the
forbidden gap $E_g$ of the channel to the conduction band of the drain... | 2208.05188v3 |
2022-08-11 | Statistical distribution of HI 21cm intervening absorbers as potential cosmic acceleration probes | Damped Lyman-$\alpha$ Absorber (DLA), or HI 21cm Absorber (H21A), is an
important probe to model-independently measure the acceleration of
spectroscopic velocity ($v_\mathrm{S}$) via the Sandage-Loeb (SL) effect.
Confined by the shortage of DLAs and Background Radio Sources (BRSs) with
adequate information, the detecta... | 2208.05639v3 |
2022-10-03 | Quintom fields from chiral anisotropic cosmology | In this paper we present an analysis of a chiral anisotropic cosmological
scenario from the perspective of quintom fields. In this setup quintessence and
phantom fields interact in a non-standard (chiral) way within an anisotropic
Bianchi type I background. We present our examination from two fronts:
classical and quan... | 2210.01186v2 |
2022-10-06 | Effects of a Pre-inflationary de Sitter Bounce on the Primordial Gravitational Waves in $f(R)$ Gravity Theories | In this work we examine the effects of a pre-inflationary de Sitter bounce on
the energy spectrum of the primordial gravitational waves. Specifically we
assume that the Universe is described by several evolution patches, starting
with a de Sitter pre-inflationary bounce which is followed by an quasi-de
Sitter slow-roll... | 2210.02861v1 |
2022-10-11 | Switching Dynamics of Shallow Arches | This paper presents an analytical method to predict the delayed switching
dynamics of nonlinear shallow arches while switching from one state to another
state for different loading cases. We study an elastic arch subject to static
loading and time-dependent loading separately. In particular, we consider a
time-dependen... | 2210.05734v2 |
2022-10-17 | Pion dynamics in a soft-wall AdS-QCD model | Pseudo-Goldstone modes appear in many physical systems and display robust
universal features. First, their mass $m$ obeys the so-called
Gell-Mann-Oakes-Renner (GMOR) relation $f^2\,m^2=H\,\bar{\sigma}$, with $f$ the
Goldstone stiffness, $H$ the explicit breaking scale and $\bar{\sigma}$ the
spontaneous condensate. More... | 2210.09088v1 |
2022-10-23 | Robust Adaptive Prescribed-Time Control for Parameter-Varying Nonlinear Systems | It is an interesting open problem to achieve adaptive prescribed-time control
for strict-feedback systems with unknown and fast or even abrupt time-varying
parameters. In this paper we present a solution with the aid of several design
and analysis innovations. First, by using a spatiotemporal transformation, we
convert... | 2210.12706v1 |
2022-11-22 | Possible enhancement of the superconducting $T_c$ due to sharp Kohn-like soft phonon anomalies | Phonon softening is a ubiquitous phenomenon in condensed matter systems which
is often associated with charge density wave (CDW) instabilities and
anharmonicity. The interplay between phonon softening, CDW and
superconductivity is a topic of intense debate. In this work, the effects of
anomalous soft phonon instabiliti... | 2211.12015v3 |
2022-11-22 | Understanding Sparse Feature Updates in Deep Networks using Iterative Linearisation | Larger and deeper networks generalise well despite their increased capacity
to overfit. Understanding why this happens is theoretically and practically
important. One recent approach looks at the infinitely wide limits of such
networks and their corresponding kernels. However, these theoretical tools
cannot fully expla... | 2211.12345v4 |
2023-01-23 | (Non)-penalized Multilevel methods for non-uniformly log-concave distributions | We study and develop multilevel methods for the numerical approximation of a
log-concave probability $\pi$ on $\mathbb{R}^d$, based on (over-damped)
Langevin diffusion. In the continuity of \cite{art:egeapanloup2021multilevel}
concentrated on the uniformly log-concave setting, we here study the procedure
in the absence... | 2301.09471v1 |
2023-02-02 | The Power of Preconditioning in Overparameterized Low-Rank Matrix Sensing | We propose $\textsf{ScaledGD($\lambda$)}$, a preconditioned gradient descent
method to tackle the low-rank matrix sensing problem when the true rank is
unknown, and when the matrix is possibly ill-conditioned. Using
overparametrized factor representations, $\textsf{ScaledGD($\lambda$)}$ starts
from a small random initi... | 2302.01186v3 |
2023-03-28 | Nonlocal Nonholonomic Source Seeking Despite Local Extrema | In this paper, we investigate the problem of source seeking with a unicycle
in the presence of local extrema. Our study is motivated by the fact that most
of the existing source seeking methods follow the gradient direction of the
signal function and thus only lead to local convergence into a neighborhood of
the neares... | 2303.16027v1 |
2023-04-18 | A blue depression in the optical spectra of M dwarfs | A blue depression is found in the spectra of M dwarfs from 4000 to 4500A.
This depression shows an increase toward lower temperatures though is
particularly sensitive to gravity and metallicity. It is the single most
sensitive feature in the optical spectra of M dwarfs. The depression appears as
centered on the neutral... | 2304.09219v2 |
2023-04-19 | Thickness-dependent magnetic properties in Pt[CoNi]n multilayers with perpendicular magnetic anisotropy | We systematically investigated the Ni and Co thickness-dependent
perpendicular magnetic anisotropy (PMA) coefficient, magnetic domain
structures, and magnetization dynamics of Pt(5 nm)/[Co(t_Co nm)/Ni(t_Ni
nm)]5/Pt(1 nm) multilayers by combining the four standard magnetic
characterization techniques. The magnetic-relat... | 2304.09366v1 |
2023-04-25 | Flow-induced oscillations of pitching swept wings: Stability boundary, vortex dynamics and force partitioning | We experimentally study the aeroelastic instability boundaries and
three-dimensional vortex dynamics of pitching swept wings, with the sweep angle
ranging from 0 to 25 degrees. The structural dynamics of the wings are
simulated using a cyber-physical control system. With a constant flow speed, a
prescribed high inertia... | 2304.12544v2 |
2023-07-04 | Exponential stability of Euler-Bernoulli beam under boundary controls in rotation and angular velocity | This paper addresses the analysis of a boundary feedback system involving a
non-homogeneous Euler-Bernoulli beam governed by the equation
$m(x)u_{tt}+\mu(x)u_{t}$$+\left(r(x)u_{xx}\right)_{xx}=0$, subject to the
initial $u(x,0)=u_0(x)$, $u_t(x,0)=v_0(x)$ and boundary conditions $u(0,t)=0$,
$\left (-r(x)u_{xx}(x,t)\righ... | 2307.01518v1 |
2023-07-13 | Exciton-polaritons in CsPbBr$_3$ crystals revealed by optical reflectivity in high magnetic fields and two-photon spectroscopy | Cesium lead bromide (CsPbBr$_3$) is a representative material of the emerging
class of lead halide perovskite semiconductors that possess remarkable
optoelectronic properties. Its optical properties in the vicinity of the band
gap energy are greatly contributed by excitons, which form exciton-polaritons
due to strong l... | 2307.07035v1 |
2023-07-19 | Impact of bulk viscosity on the post-merger gravitational-wave signal from merging neutron stars | In the violent post-merger of binary neutron-star mergers strong oscillations
are present that impact the emitted gravitational-wave (GW) signal. The
frequencies, temperatures and densities involved in these oscillations allow
for violations of the chemical equilibrium promoted by weak-interactions, thus
leading to a n... | 2307.10464v1 |
2023-07-21 | Non-ideal magnetohydrodynamics on a moving mesh I: Ohmic and ambipolar diffusion | Especially in cold and high-density regions, the assumptions of ideal
magnetohydrodynamics (MHD) can break down, making first order non-ideal terms
such as Ohmic and ambipolar diffusion as well as the Hall effect important. In
this study we present a new numerical scheme for the first two resistive terms,
which we impl... | 2307.11814v1 |
2023-09-14 | The cost of solving linear differential equations on a quantum computer: fast-forwarding to explicit resource counts | How well can quantum computers simulate classical dynamical systems? There is
increasing effort in developing quantum algorithms to efficiently simulate
dynamics beyond Hamiltonian simulation, but so far exact resource estimates are
not known. In this work, we provide two significant contributions. First, we
give the f... | 2309.07881v2 |
2023-09-18 | Coherent Tunneling and Strain Sensitivity of an All Heusler Alloy Magnetic Tunneling Junction: A First-Principles Study | Half-metallic Co-based full Heusler alloys have captured considerable
attention of the researchers in the realm of spintronic applications, owing to
their remarkable characteristics such as exceptionally high spin polarization
at Fermi level, ultra-low Gilbert damping, and high Curie temperature. In this
comprehensive ... | 2309.09755v1 |
2023-09-25 | Domain wall dynamics driven by a transient laser-induced magnetisation | One of the fundamental effects of the laser-matter interaction is the
appearance of an induced transient magnetisation. While the underlying
phenomena differ in their microscopic origin and cover a diverse array of
materials, here we address a fundamental question about the possibility to
drive domain-wall dynamics on ... | 2309.14287v1 |
2023-10-03 | Controlled Quasi-Latitudinal Solutions for ultra-fast Spin-Torque Precessional Magnetization Switching | The aim of the paper is to present a novel class of time-dependent controls
to realize ultra-fast magnetization switching in nanomagnets driven by
spin-torques produced by spin-polarized electric currents. Magnetization
dynamics in such systems is governed by the Landau-Lifshitz-Slonczewski
equation which describes the... | 2310.02070v1 |
2023-09-29 | A Fast second-order solver for stiff multifluid dust and gas hydrodynamics | We present MDIRK: a Multifluid second-order Diagonally-Implicit Runge-Kutta
method to study momentum transfer between gas and an arbitrary number ($N$) of
dust species. The method integrates the equations of hydrodynamics with an
Implicit Explicit (IMEX) scheme and solves the stiff source term in the
momentum equation ... | 2310.04435v3 |
2023-10-19 | Error-mitigated fermionic classical shadows on noisy quantum devices | Efficiently estimating the expectation values of fermionic Hamiltonians,
including $k$-particle reduced density matrices ($k$-RDMs) of an $n$-mode
fermionic state, is crucial for quantum simulations of a wealth of physical
systems from the fields of many-body physics, chemistry, and materials. Yet,
conventional quantum... | 2310.12726v2 |
2023-11-02 | Phase space noncommutativity, power-law inflation and quantum cosmology | Considering an arbitrary dimensional FLRW universe in the framework of a
generalized S\'{a}ez--Ballester (SB) theory, we establish a noncommutative (NC)
cosmological model. We concentrate on the predictions of NC model and compare
them with their commutative counterparts in both the classical and quantum
regimes. For t... | 2311.01627v1 |
2023-11-04 | Electronic quantum wires in extended quasiparticle picture | A one-dimensional quantum wire of Fermions is considered and ground state
properties are calculated in the high density regime within the extended
quasiparticle picture and Born approximation. Expanding the two-particle Green
functions determines the selfenergy and the polarization as well as the
response function on t... | 2311.02414v1 |
2023-11-14 | Berry curvature induced giant intrinsic spin-orbit torque in single layer magnetic Weyl semimetal thin films | Topological quantum materials can exhibit unconventional surface states and
anomalous transport properties, but their applications to spintronic devices
are restricted as they require the growth of high-quality thin films with
bulk-like properties. Here, we study 10--30 nm thick epitaxial ferromagnetic
Co$_{\rm 2}$MnGa... | 2311.08145v2 |
2023-12-26 | All solution grown epitaxial magnonic crystal of thulium iron garnet thin film | Magnonics has shown the immense potential of compatibility with CMOS devices
and the ability to be utilized in futuristic quantum computing. Therefore, the
magnonic crystals, both metallic and insulating, are under extensive
exploration. The presence of high spin-orbit interaction induced by the
presence of rare-earth ... | 2312.15973v1 |
2023-12-01 | Large enhancement of spin-orbit torques under a MHz modulation due to phonon-magnon coupling | The discovery of spin-orbit torques (SOTs) generated through the spin Hall or
Rashba effects provides an alternative write approach for magnetic
random-access memory (MRAM), igniting the development of spin-orbitronics in
recent years. Quantitative characterization of SOTs highly relies on the
SOT-driven ferromagnetic ... | 2401.02967v1 |
2024-01-25 | Photon propagation in a charged Bose-Einstein condensate | We consider the propagation of photons in the background of a Bose-Einstein
(BE) condensate of a charged scalar field, by extending a method recently
proposed to treat the propagation of fermions in a BE condensate. We determine
the dispersion relations of the collective modes of the system, as well as the
photon polar... | 2401.13896v1 |
2024-01-26 | Well-posedness and stability of the Navier-Stokes-Maxwell equations | The paper is devoted to studying the well-posedness and stability of the
generalized Navier-Stokes-Maxwell (NSM) equations with the standard Ohm's law
in $\mathbb{R}^d$ for $d \in \{2,3\}$. More precisely, the global
well-posedness is established in case of fractional Laplacian velocity
$(-\Delta)^\alpha v$ with $\alph... | 2401.14839v2 |
2024-03-14 | The effect of spatially-varying collision frequency on the development of the Rayleigh-Taylor instability | The Rayleigh-Taylor (RT) instability is ubiquitously observed, yet has
traditionally been studied using ideal fluid models. Collisionality can vary
strongly across the fluid interface, and previous work demonstrates the
necessity of kinetic models to completely capture dynamics in certain
collisional regimes. Where pre... | 2403.09591v1 |
2024-04-11 | The Cattaneo-Christov approximation of Fourier heat-conductive compressible fluids | We investigate the Navier-Stokes-Cattaneo-Christov (NSC) system in
$\mathbb{R}^d$ ($d\geq3$), a model of heat-conductive compressible flows
serving as a finite speed of propagation approximation of the
Navier-Stokes-Fourier (NSF) system. Due to the presence of Oldroyd's
upper-convected derivatives, the system (NSC) exh... | 2404.07809v1 |
2003-10-29 | Comparing Chemical Abundances of the Damped Lya Systems and Metal-Poor Stars | I briefly draw comparisons between the fields of damped Lya and metal-poor
stellar abundances. In particular, I examine their complementary
age-metallicity relations and comparisons between the damped Lya and dwarf
galaxy abundance patterns. Regarding the latter, I describe a series of
problems concerning associating h... | 0310850v1 |
2006-12-01 | Stochastic excitation and damping of solar-type oscillations | A review on acoustic mode damping and excitation in solar-type stars is
presented. Current models for linear damping rates are discussed in the light
of recent low-degree solar linewidth measurements with emphasis on the
frequency-dependence of damping rates of low-order modes. Recent developments
in stochastic excitat... | 0612024v1 |
1997-08-11 | A theoretical study on the damping of collective excitations in a Bose-Einstein condensate | We study the damping of low-lying collective excitations of condensates in a
weakly interacting Bose gas model within the framework of imaginary time path
integral. A general expression of the damping rate has been obtained in the low
momentum limit for both the very low temperature regime and the higher
temperature re... | 9708080v3 |
1997-09-24 | Damping in dilute Bose gases: a mean-field approach | Damping in a dilute Bose gas is investigated using a mean-field approximation
which describes the coupled oscillations of condensate and non-condensate atoms
in the collisionless regime. Explicit results for both Landau and Beliaev
damping rates are given for non-uniform gases. In the case of uniform systems
we obtain ... | 9709259v1 |
2000-09-01 | Damped Bogoliubov excitations of a condensate interacting with a static thermal cloud | We calculate the damping of condensate collective excitations at finite
temperatures arising from the lack of equilibrium between the condensate and
thermal atoms. We neglect the non-condensate dynamics by fixing the thermal
cloud in static equilibrium. We derive a set of generalized Bogoliubov
equations for finite tem... | 0009021v2 |
2000-11-20 | Cavity assisted quasiparticle damping in a Bose-Einstein condensate | We consider an atomic Bose-Einstein condensate held within an optical cavity
and interacting with laser fields. We show how the interaction of the cavity
mode with the condensate can cause energy due to excitations to be coupled to a
lossy cavity mode, which then decays, thus damping the condensate, how to
choose param... | 0011341v2 |
2002-12-16 | The nonlinear damping of Bose-Einstein condensate oscillations at ultra-low temperatures | We analyze the damping of the transverse breathing mode in an elongated trap
at ultralow temperatures. The damping occurs due to the parametric resonance
entailing the energy transfer to the longitudinal degrees of freedom. It is
found that the nonlinear coupling between the transverse and discrete
longitudinal modes c... | 0212377v2 |
2004-08-27 | Tunable magnetization damping in transition metal ternary alloys | We show that magnetization damping in Permalloy, Ni80Fe20 (``Py''), can be
enhanced sufficiently to reduce post-switching magnetization precession to an
acceptable level by alloying with the transition metal osmium (Os). The damping
increases monotonically upon raising the Os-concentration in Py, at least up to
9% of O... | 0408608v1 |
2005-03-06 | Nonlinear damping in nanomechanical beam oscillator | We investigate the impact of nonlinear damping on the dynamics of a
nanomechanical doubly clamped beam. The beam is driven into nonlinear regime
and the response is measured by a displacement detector. For data analysis we
introduce a nonlinear damping term to Duffing equation. The experiment shows
conclusively that ac... | 0503130v2 |
2006-05-23 | The origin of increase of damping in transition metals with rare earth impurities | The damping due to rare earth impurities in transition metals is discussed in
the low concentration limit. It is shown that the increase in damping is mainly
due to the coupling of the orbital moments of the rare earth impurities and the
conduction $p$-electrons. It is shown that an itinerant picture for the host
trans... | 0605583v1 |
2001-05-14 | Simplified models of electromagnetic and gravitational radiation damping | In previous work the authors analysed the global properties of an approximate
model of radiation damping for charged particles. This work is put into context
and related to the original motivation of understanding approximations used in
the study of gravitational radiation damping. It is examined to what extent the
res... | 0105045v1 |
1994-06-07 | Damping Rate of a Yukawa Fermion at Finite Temperature | The damping of a massless fermion coupled to a massless scalar particle at
finite temperature is considered using the Braaten-Pisarski resummation
technique. First the hard thermal loop diagrams of this theory are extracted
and effective Green's functions are constructed. Using these effective Green's
functions the dam... | 9406242v1 |
2006-05-02 | Moduli decay in the hot early Universe | We consider moduli fields interacting with thermalized relativistic matter.
We determine the temperature dependence of their damping rate and find it is
dominated by thermal effects in the high temperature regime, i.e. for
temperatures larger than their mass. For a simple scalar model the damping rate
is expressed thro... | 0605030v2 |
2006-11-27 | Inviscid limit for damped and driven incompressible Navier-Stokes equations in ${{\mathbb R}^2}$ | We consider the zero viscosity limit of long time averages of solutions of
damped and driven Navier-Stokes equations in ${\mathbb R}^2$. We prove that the
rate of dissipation of enstrophy vanishes. Stationary statistical solutions of
the damped and driven Navier-Stokes equations converge to renormalized
stationary stat... | 0611782v1 |
2001-11-25 | The Landau Damping Effect and Complex-valued Nature of Physical Quantities | Within the framework of the hypothesis offered by authors about
complex-valued nature of physical quantities, the effect of the Landau damping
has been explored with assumption that not only frequency can be a small
imaginary component but also a wave vector. The numerical solution of the
obtained dispersion equation t... | 0111176v1 |
2005-10-14 | Nontrapping arrest of Langmuir wave damping near the threshold amplitude | Evolution of a Langmuir wave is studied numerically for finite amplitudes
slightly above the threshold which separates damping from nondamping cases.
Arrest of linear damping is found to be a second-order effect due to ballistic
evolution of perturbations, resonant power transfer between field and
particles, and organi... | 0510131v3 |
2000-06-22 | Decoherence and Entanglement in Two-mode Squeezed Vacuum States | I investigate the decoherence of two-mode squeezed vacuum states by analyzing
the relative entropy of entanglement. I consider two sources of decoherence:
(i) the phase damping and (ii) the amplitude damping due to the coupling to the
thermal environment. In particular, I give the exact value of the relative
entropy of... | 0006100v1 |
2006-08-02 | Damped Population Oscillation in a Spontaneously Decaying Two-Level Atom Coupled to a Monochromatic Field | We investigate the time evolution of atomic population in a two-level atom
driven by a monochromatic radiation field, taking spontaneous emission into
account. The Rabi oscillation exhibits amplitude damping in time caused by
spontaneous emission. We show that the semiclassical master equation leads in
general to an ov... | 0608020v1 |
2006-11-23 | Analytical solutions for two-level systems with damping | A method is proposed to transform any analytic solution of the Bloch equation
into an analytic solution of the Landau-Lifshitz-Gilbert equation. This allows
for the analytical description of the dynamics of a two level system with
damping. This method shows that damping turns the linear Schr\"{o}dinger
equation of a tw... | 0611238v1 |
2007-06-12 | Gilbert and Landau-Lifshitz damping in the presense of spin-torque | A recent article by Stiles et al. (cond-mat/0702020) argued in favor of the
Landau-Lifshitz damping term in the micromagnetic equations of motion over that
of the more commonly accepted Gilbert damping form. Much of their argument
revolved around spin-torque driven domain wall motion in narrow magnetic wires,
since the... | 0706.1736v1 |
2008-04-04 | Inhomogeneous Gilbert damping from impurities and electron-electron interactions | We present a unified theory of magnetic damping in itinerant electron
ferromagnets at order $q^2$ including electron-electron interactions and
disorder scattering. We show that the Gilbert damping coefficient can be
expressed in terms of the spin conductivity, leading to a Matthiessen-type
formula in which disorder and... | 0804.0820v2 |
2008-12-18 | Dipole Oscillations of a Fermi Gas in a Disordered Trap: Damping and Localization | We theoretically study the dipole oscillations of an ideal Fermi gas in a
disordered trap. We show that even weak disorder induces strong damping of the
oscillations and we identify a metal-insulator crossover. For very weak
disorder, we show that damping results from a dephasing effect related to weak
random perturbat... | 0812.3501v2 |
2009-03-11 | Confronting the damping of the baryon acoustic oscillations with observation | We investigate the damping of the baryon acoustic oscillations in the matter
power spectrum due to the quasinonlinear clustering and redshift-space
distortions by confronting the models with the observations of the Sloan
Digital Sky Survey luminous red galaxy sample. The chi-squared test suggests
that the observed powe... | 0903.1883v1 |
2009-04-10 | Spectral deviations for the damped wave equation | We prove a Weyl-type fractal upper bound for the spectrum of the damped wave
equation, on a negatively curved compact manifold. It is known that most of the
eigenvalues have an imaginary part close to the average of the damping
function. We count the number of eigenvalues in a given horizontal strip
deviating from this... | 0904.1736v1 |
2009-10-26 | Pressure Fronts in 1D Damped Nonlinear Lattices | The propagation of pressure fronts (impact solutions) in 1D chains of atoms
coupled by anharmonic potentials between nearest neighbor and submitted to
damping forces preserving uniform motion, is investigated. Travelling fronts
between two regions at different uniform pressures are found numerically and
well approximat... | 0910.4890v1 |
2010-01-12 | Decoherence and damping in ideal gases | The particle and current densities are shown to display damping and undergo
decoherence in ideal quantum gases. The damping is read off from the equations
of motion reminiscent of the Navier-Stokes equations and shows some formal
similarity with Landau damping. The decoherence leads to consistent density and
current hi... | 1001.1803v2 |
2010-05-14 | The effect of spin magnetization in the damping of electron plasma oscillations | The effect of spin of particles in the propagation of plasma waves is studied
using a semi-classical kinetic theory for a magnetized plasma. We focus in the
simple damping effects for the electrostatic wave modes besides Landau damping.
Without taking into account more quantum effects than spin contribution to
Vlasov's... | 1005.2573v1 |
2010-06-01 | Recent Progress on a Manifold Damped and Detuned Structure for CLIC | A damped detuned structure for the main X-band linacs of CLIC is being
investigated as an alternative design to the present baseline heavily damped
structure. In our earlier designs we studied detuned structures, operating at
11.994 GHz, with a range of dipole bandwidths in order to ensure the structure
satisfies beam ... | 1006.0087v1 |
2010-07-21 | Finite temperature damping of collective modes of a BCS-BEC crossover superfluid | A new mechanism is proposed to explain the puzzling damping of collective
excitations, which was recently observed in the experiments of strongly
interacting Fermi gases below the superfluid critical temperature on the
fermionic (BCS) side of Feshbach resonance. Sound velocity, superfluid density
and damping rate are c... | 1007.3694v2 |
2010-08-04 | Confinement induced by fermion damping in three-dimensional QED | The three-dimensional non-compact QED is known to exhibit weak confinement
when fermions acquire a finite mass via the mechanism of dynamical chiral
symmetry breaking. In this paper, we study the effect of fermion damping caused
by elastic scattering on the classical potential between fermions. By
calculating the vacuu... | 1008.0736v2 |
2011-06-22 | Highly Damped Quasinormal Modes and the Small Scale Structure of Quantum Corrected Black Hole Exteriors | Quasinormal modes provide valuable information about the structure of
spacetime outside a black hole. There is also a conjectured relationship
between the highly damped quasinormal modes and the semi-classical spectrum of
the horizon area/entropy. In this paper, we show that for spacetimes
characterized by more than on... | 1106.4357v1 |
2012-02-20 | Simple Non-Markovian Microscopic Models for the Depolarizing Channel of a Single Qubit | The archetypal one-qubit noisy channels ---depolarizing, phase-damping and
amplitude-damping channels--- describe both Markovian and non-Markovian
evolution. Simple microscopic models for the depolarizing channel, both
classical and quantum, are considered. Microscopic models which describe phase
damping and amplitude ... | 1202.4210v4 |
2012-06-14 | Damping of optomechanical disks resonators vibrating in air | We report on miniature GaAs disk optomechanical resonators vibrating in air
in the radiofrequency range. The flexural modes of the disks are studied by
scanning electron microscopy and optical interferometry, and correctly modeled
with the elasticity theory for annular plates. The mechanical damping is
systematically m... | 1206.3032v1 |
2012-07-09 | A Generalized Interpolation Inequality and its Application to the Stabilization of Damped Equations | In this paper, we establish a generalized H{\"o}lder's or interpolation
inequality for weighted spaces in which the weights are non-necessarily
homogeneous. We apply it to the stabilization of some damped wave-like
evolution equations. This allows obtaining explicit decay rates for smooth
solutions for more general cla... | 1207.2030v2 |
2012-07-10 | Conformation dependent damping and generalization of fluctuation-dissipation relation | Damping on an object generally depends on its conformation (shape size etc.).
We consider the Langevin dynamics of a model system with a conformation
dependent damping and generalize the fluctuation dissipation relation to fit in
such a situation. We derive equilibrium distribution function for such a case
which conver... | 1207.2218v2 |
2012-10-30 | On algebraic damping close to inhomogeneous Vlasov equilibria in multi-dimensional spaces | We investigate the asymptotic damping of a perturbation around inhomogeneous
stable stationary states of the Vlasov equation in spatially multi-dimensional
systems. We show that branch singularities of the Fourier-Laplace transform of
the perturbation yield algebraic dampings. In two spatial dimensions, we
classify the... | 1210.8040v1 |
2013-04-07 | Phenomenological model of anomalous magnon softening and damping in half-metallic manganites | To describe anomalous zone-boundary softening and damping of magnons in
manganites we present a phenomenological two-fluid model containing
ferromagnetic Fermi-liquid and non-Fermi-liquid components. The Fermi-liquid
component accounts for softening of zone-boundary magnons and for the Landau
damping of magnons in the ... | 1304.1983v1 |
2013-04-25 | Determination of Transverse Density Structuring from Propagating MHD Waves in the Solar Atmosphere | We present a Bayesian seismology inversion technique for propagating
magnetohydrodynamic (MHD) transverse waves observed in coronal waveguides. The
technique uses theoretical predictions for the spatial damping of propagating
kink waves in transversely inhomogeneous coronal waveguides. It combines wave
amplitude dampin... | 1304.6869v1 |
2013-07-08 | Optimal decay rate of the bipolar Euler-Poisson system with damping in $\mathbb{R}^3$ | By rewriting a bipolar Euler-Poisson equations with damping into an Euler
equation with damping coupled with an Euler-Poisson equation with damping, and
using a new spectral analysis, we obtain the optimal decay results of the
solutions in $L^2$-norm, which improve theose in \cite{Li3, Wu3}. More
precisely, the velocit... | 1307.2081v1 |
2013-07-27 | Symmetry considerations on radiation damping | It is well known that a direct Lagrangian description of radiation damping is
still missing. In this paper we will use a specific approach of this problem
which is the standard way to treat the radiation damping problem. The
objectives here are to construct: a N=2 supersymmetric extension for the model
describing the r... | 1307.7319v1 |
2014-02-10 | Damping of a nanocantilever by paramagnetic spins | We compute damping of mechanical oscillations of a cantilever that contains
flipping paramagnetic spins. This kind of damping is mandated by the dynamics
of the total angular momentum, spin + mechanical. Rigorous expression for the
damping rate is derived in terms of measurable parameters. The effect of spins
on the qu... | 1402.2326v1 |
2014-02-20 | Long-time behavior of solutions of a BBM equation with generalized damping | We study the long-time behavior of the solution of a damped BBM equation $u_t
+ u_x - u_{xxt} + uu_x + \mathscr{L}_{\gamma}(u) = 0$. The proposed dampings
$\mathscr{L}_{\gamma}$ generalize standards ones, as parabolic
($\mathscr{L}_{\gamma}(u)=-\Delta u$) or weak damping
($\mathscr{L}_{\gamma}(u)=\gamma u$) and allows ... | 1402.5009v1 |
2014-02-24 | N=2 supersymmetric radiation damping problem on a noncommutative plane | It is well known that a direct Lagrangian description of radiation damping is
still missing. In this paper a specific approach of this problem was used,
which is the standard way to treat the radiation damping problem. A $N=2$
supersymmetric extension for the model describing the radiation damping on the
noncommutative... | 1402.6996v1 |
2014-11-03 | Renormalized solutions to the continuity equation with an integrable damping term | We consider the continuity equation with a nonsmooth vector field and a
damping term. In their fundamental paper, DiPerna and Lions proved that, when
the damping term is bounded in space and time, the equation is well posed in
the class of distributional solutions and the solution is transported by
suitable characteris... | 1411.0451v1 |
2015-02-07 | Landau Damping in a Mixture of Bose and Fermi Superfluids | We study the Landau damping in Bose-Fermi superfluid mixture at finite
temperature. We find that at low temperature, the Landau damping rate will be
exponentially suppressed at both the BCS side and the BEC side of Fermi
superfluid. The momentum dependence of the damping rate is obtained, and it is
quite different from... | 1502.02116v1 |
2015-03-20 | Applying a formula for generator redispatch to damp interarea oscillations using synchrophasors | If an interarea oscillatory mode has insufficient damping, generator
redispatch can be used to improve its damping. We explain and apply a new
analytic formula for the modal sensitivity to rank the best pairs of generators
to redispatch. The formula requires some dynamic power system data and we show
how to obtain that... | 1503.06144v2 |
2016-01-21 | Codeword Stabilized Quantum Codes for Asymmetric Channels | We discuss a method to adapt the codeword stabilized (CWS) quantum code
framework to the problem of finding asymmetric quantum codes. We focus on the
corresponding Pauli error models for amplitude damping noise and phase damping
noise. In particular, we look at codes for Pauli error models that correct one
or two ampli... | 1601.05763v1 |
2016-02-08 | On Boundary Damped Inhomogeneous Timoshenko Beams and Related Problems | We consider the model equations for the Timoshenko beam as a first order
system in the framework of evolutionary equations. The focus is on boundary
damping, which is implemented as a dynamic boundary condition. A change of
material laws allows to include a large class of cases of boundary damping. By
choosing a partic... | 1602.02521v1 |
2016-02-13 | Diffusion phenomena for the wave equation with space-dependent damping in an exterior domain | In this paper, we consider the asymptotic behavior of solutions to the wave
equation with space-dependent damping in an exterior domain. We prove that when
the damping is effective, the solution is approximated by that of the
corresponding heat equation as time tends to infinity. Our proof is based on
semigroup estimat... | 1602.04318v1 |
2016-02-29 | Robust quantum state recovery from amplitude damping within a mixed states framework | Due to the interaction with the environment, a quantum state is subjected to
decoherence which becomes one of the biggest problems for practical quantum
computation. Amplitude damping is one of the most important decoherence
processes. Here, we show that general two-qubit mixed states undergoing an
amplitude damping ca... | 1602.08865v1 |
2016-07-21 | Protecting and enhancing spin squeezing under decoherence using weak measurement | We propose an efficient method to protect spin squeezing under the action of
amplitude-damping, depolarizing and phase-damping channels based on measurement
reversal from weak measurement, and consider an ensemble of N independent
spin-1/2 particles with exchange symmetry. We find that spin squeezing can be
enhanced gr... | 1607.06530v2 |
2016-08-02 | Ferromagnetic Damping/Anti-damping in a Periodic 2D Helical surface; A Non-Equilibrium Keldysh Green Function Approach | In this paper, we investigate theoretically the spin-orbit torque as well as
the Gilbert damping for a two band model of a 2D helical surface state with a
Ferromagnetic (FM) exchange coupling. We decompose the density matrix into the
Fermi sea and Fermi surface components and obtain their contributions to the
electroni... | 1608.00984v2 |
2016-09-05 | Remarks on an elliptic problem arising in weighted energy estimates for wave equations with space-dependent damping term in an exterior domain | This paper is concerned with weighted energy estimates and diffusion
phenomena for the initial-boundary problem of the wave equation with
space-dependent damping term in an exterior domain. In this analysis, an
elliptic problem was introduced by Todorova and Yordanov. This attempt was
quite useful when the coefficient ... | 1609.01063v2 |
2016-11-16 | Finite-orbit-width effects on the geodesic acoustic mode in the toroidally rotating tokamak plasma | The Landau damping of geodesic acoustic mode (GAM) in a torodial rotating
tokamak plasma is analytically investigated by taking into account the
finite-orbit-width (FOW) resonance effect to the 3rd order. The analytical
result is shown to agree well with the numerical solution. The dependence of
the damping rate on the... | 1611.05168v1 |
2017-03-09 | Long-time dynamics of the strongly damped semilinear plate equation in $\mathbb{R}^{n}$ | We investigate the initial-value problem for the semilinear plate equation
containing localized strong damping, localized weak damping and nonlocal
nonlinearity. We prove that if nonnegative damping coefficients are strictly
positive almost everywhere in the exterior of some ball and the sum of these
coefficients is po... | 1703.03485v2 |
2017-04-21 | The Effects of Rolling Deformation and Annealing Treatment on Damping Capacity of 1200 Aluminium Alloy | Annealing treatment is an important step of rolling deformation that
contributes to microstructural evolution and leads to the significant changes
in damping capacity. Damping capacities were analyzed in the parallel to
rolling direction at 1 and 10 Hz respectively. It was found that severe plastic
deformation at 40 pe... | 1704.07362v1 |
2017-07-12 | Isolated resonances and nonlinear damping | We analyze isolated resonance curves (IRCs) in a single-degree-of-freedom
system with nonlinear damping. The adopted procedure exploits singularity
theory in conjunction with the harmonic balance method. The analysis unveils a
geometrical connection between the topology of the damping force and IRCs.
Specifically, we d... | 1707.03561v2 |
2017-07-25 | Best exponential decay rate of energy for the vectorial damped wave equation | The energy of solutions of the scalar damped wave equation decays uniformly
exponentially fast when the geometric control condition is satisfied. A theorem
of Lebeau [leb93] gives an expression of this exponential decay rate in terms
of the average value of the damping terms along geodesics and of the spectrum
of the i... | 1707.07893v1 |
2017-08-20 | Radiation Damping of a Polarizable Particle | A polarizable body moving in an external electromagnetic field will slow
down. This effect is referred to as radiation damping and is analogous to
Doppler cooling in atomic physics. Using the principles of special relativity
we derive an expression for the radiation damping force and find that it solely
depends on the ... | 1708.06628v1 |
2017-09-13 | Energy decay for the Klein-Gordon equation with highly oscillating damping | We consider the free Klein-Gordon equation with periodic damping. We show on
this simple model that if the usual geometric condition holds then the decay of
the energy is uniform with respect to the oscillations of the damping, and in
particular the size of the derivatives do not play any role. We also show that
withou... | 1709.04197v1 |
2017-11-01 | Analysis of A Splitting Scheme for Damped Stochastic Nonlinear Schrödinger Equation with Multiplicative Noise | In this paper, we investigate the damped stochastic nonlinear
Schr\"odinger(NLS) equation with multiplicative noise and its splitting-based
approximation. When the damped effect is large enough, we prove that the
solutions of the damped stochastic NLS equation and the splitting scheme are
exponential stable and possess... | 1711.00516v2 |
2017-12-31 | Stabilization of the weakly coupled wave-plate system with one internal damping | This paper is addressed to a stabilization problem of a system coupled by a
wave and a Euler-Bernoulli plate equation. Only one equation is supposed to be
damped. Under some assumption about the damping and the coupling terms, it is
shown that sufficiently smooth solutions of the system decay logarithmically at
infinit... | 1801.00232v1 |
2018-05-10 | Dynamics of coherence-induced state ordering under Markovian channels | We study the dynamics of coherence-induced state ordering under incoherent
channels, particularly four specific Markovian channels: $-$ amplitude damping
channel, phase damping channel, depolarizing channel and bit flit channel for
single-qubit states. We show that the amplitude damping channel, phase damping
channel, ... | 1805.03898v1 |
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