publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2020-03-13 | Photon and Phonon Spectral-Functions for Continuum Quantum Optomechanics | We study many-particle phenomena of propagating multi-mode photons and
phonons interacting through Brillouin scattering-type Hamiltonian in nanoscale
waveguides. We derive photon and phonon retarded Green's functions and extract
their spectral functions in applying the factorization approximation of the
mean-field theo... | 2003.06355v1 |
2020-03-13 | Surface waves in a collisional quark-gluon plasma | Surface waves propagating in the semi-bounded collisional hot QCD medium
(quark-gluon plasma) are considered. To investigate the effect of collisions as
damping and non-ideality factor, the longitudinal and transverse dielectric
functions of the quark-gluon plasma are used within the Bhatnagar-Gross-Krook
(BGK) approac... | 2003.06373v2 |
2020-03-18 | Finite time extinction for the strongly damped nonlinear Schr{ö}dinger equation in bounded domains | We prove the \textit{finite time extinction property} $(u(t)\equiv 0$ on
$\Omega$ for any $t\ge T_\star,$ for some $T_\star>0)$ for solutions of the
nonlinear Schr\"{o}dinger problem ${\rm i} u_t+\Delta u+a|u|^{-(1-m)}u=f(t,x),$
on a bounded domain $\Omega$ of $\mathbb{R}^N,$ $N\le 3,$ $a\in\mathbb{C}$ with
$\Im(a)>0$ ... | 2003.08105v2 |
2020-03-19 | Challenge for describing the cluster states starting with realistic interaction | We aim to describe the cluster states of nuclear systems starting with a
realistic interaction, which is a challenge of modern nuclear theories. Here,
the short-range correlation of realistic interaction is treated by employing
the damping factor, and the resultant interaction can be applied to the cluster
structure of... | 2003.08546v1 |
2020-03-20 | Large Deflections of A Structurally Damped Panel in A Subsonic Flow | The large deflections of panels in subsonic flow are considered.
Specifically, a fully clamped von Karman plate accounting for both rotational
inertia in plate filaments and structural damping of square root type is
considered. The panel is taken to be embedded in the boundary of a linear,
subsonic potential flow on th... | 2003.09232v1 |
2020-03-24 | Pulsed RF Schemes for Tearing Mode Stabilization | The RF stabilization of tearing modes with current condensation has the
potential to increase stabilization efficiency and loosen power localization
requirements. Such benefits stem from the cooperative feedback between the RF
deposition and resulting island temperature perturbation governed by diffusion.
A self consis... | 2003.10896v1 |
2020-03-24 | Detecting Multiple DLAs per Spectrum in SDSS DR12 with Gaussian Processes | We present a revised version of our automated technique using Gaussian
processes (GPs) to detect Damped Lyman-$\alpha$ absorbers (DLAs) along quasar
(QSO) sightlines. The main improvement is to allow our Gaussian process
pipeline to detect multiple DLAs along a single sightline. Our DLA detections
are regularised by an... | 2003.11036v2 |
2020-03-28 | Quantum speed limit based on the bound of Bures angle | In this paper, we investigate the unified bound of quantum speed limit time
in open systems based on the modified Bures angle. This bound is applied to the
damped Jaynes-Cummings model and the dephasing model, and the analytical
quantum speed limit time is obtained for both models. As an example, the
maximum coherent q... | 2003.12758v1 |
2020-03-31 | First-principles study of ultrafast dynamics of Dirac plasmon in graphene | Exploring low-loss two-dimensional plasmon modes is considered central for
achieving light manipulation at the nanoscale and applications in plasmonic
science and technology. In this context, pump-probe spectroscopy is a powerful
tool for investigating these collective modes and the corresponding energy
transfer proces... | 2003.14074v2 |
2020-03-31 | Parametric analysis of COVID-19 expansion in European countries in the period of February to June 2020 | The data on number of registered cases of COVID-19 disease in twenty European
countries is analyzed by the least-squares fitting procedure with generic
analytic functions. Three regimes of the expansion of the disease are
identified and quantified -- early exponential expansion, damped exponential,
and linear expansion... | 2003.14283v2 |
2020-04-14 | Stability results of an elastic/viscoelastic transmission problem of locally coupled waves with non smooth coefficients | We investigate the stabilization of a locally coupled wave equations with
only one internal viscoelastic damping of Kelvin-Voigt type. The main novelty
in this paper is that both the damping and the coupling coefficients are non
smooth. First, using a general criteria of Arendt-Batty, combined with an
uniqueness result... | 2004.06758v1 |
2020-04-16 | Ergodicity effects on transport-diffusion equations with localized damping | The main objective of this paper is to study the time decay of
transport-diffusion equation with inhomogeneous localized damping in the
multi-dimensional torus. The drift is governed by an autonomous Lipschitz
vector field and the diffusion by the standard heat equation with small
viscosity parameter $\nu$. In the firs... | 2004.07712v1 |
2020-04-17 | Majorization-Minimization-Based Levenberg--Marquardt Method for Constrained Nonlinear Least Squares | A new Levenberg--Marquardt (LM) method for solving nonlinear least squares
problems with convex constraints is described. Various versions of the LM
method have been proposed, their main differences being in the choice of a
damping parameter. In this paper, we propose a new rule for updating the
parameter so as to achi... | 2004.08259v3 |
2020-04-23 | Many-body Decay of the Gapped Lowest Excitation of a Bose-Einstein Condensate | We study the decay mechanism of the gapped lowest-lying excitation of a
quasi-pure box-trapped atomic Bose-Einstein condensate. Owing to the absence of
lower-energy modes, or direct coupling to an external bath, this excitation is
protected against one-body (linear) decay and the damping mechanism is
exclusively nonlin... | 2004.11363v1 |
2020-05-05 | Hydrodynamic memory can boost enormously driven nonlinear diffusion and transport | Hydrodynamic memory force or Basset force is known since the 19th-century.
Its influence on Brownian motion remains, however, mostly unexplored. Here, we
investigate its role in nonlinear transport and diffusion within a paradigmatic
model of tilted washboard potential. In this model, a giant enhancement of
driven diff... | 2005.01984v2 |
2020-05-05 | Diffraction losses of a Fabry-Perot cavity with nonidentical non-spherical mirrors | Optical cavities with both optimized resonant conditions and high quality
factors are important metrological tools. In particular, they are used for
laser gravitational wave (GW) detectors. It is necessary to suppress the
parametric instability by damping the resonant conditions of harmful higher
order optical modes (H... | 2005.02033v1 |
2020-05-11 | Sound Absorption in Partially Ionized Hydrogen Plasma and Heating Mechanism of Solar Chromosphere | The temperature dependence of rates of electron impact ionization and two
electrons recombination are calculated using Wannier cross section of electron
impact ionization of neutral hydrogen atom. Entropy production and power
dissipation are derived for the case when the ionization degree deviates from
its equilibrium ... | 2005.05056v4 |
2020-05-12 | Calculating RF current condensation with self-consistent ray-tracing | By exploiting the nonlinear amplification of the power deposition of RF
waves, current condensation promises new pathways to the stabilisation of
magnetic islands. We present a numerical analysis of current condensation,
coupling a geometrical optics treatment of wave propagation and damping to a
thermal diffusion equa... | 2005.05997v1 |
2020-05-13 | Sustaining a temperature difference | We derive an expression for the minimal rate of entropy that sustains two
reservoirs at different temperatures $T_0$ and $T_\ell$. The law displays an
intuitive $\ell^{-1}$ dependency on the relative distance and a characterisic
$\log^2 (T_\ell/T_0)$ dependency on the boundary temperatures. First we give a
back-of-enve... | 2005.06289v2 |
2020-05-13 | Numerical simulations of unsteady viscous incompressible flows using general pressure equation | In fluid dynamics, an important problem is linked to the knowledge of the
fluid pressure. Recently, another approach to study incompressible fluid flow
was suggested. It consists in using a general pressure equation (GPE) derived
from compressible Navier-Stokes equation. In this paper, GPE is considered and
compared wi... | 2005.06448v1 |
2020-05-15 | Response of the BGO Calorimeter to Cosmic Ray Nuclei in the DAMPE Experiment on Orbit | This paper is about a study on the response of the BGO calorimeter of DAMPE
experiment. Four elements in Cosmic Ray nuclei are used as sources for this
analysis. A feature resulting from the geomagnetic cutoff exhibits in the
energy spectrum, both in simulated and reconstructed data, and is compared
between them. | 2005.07621v1 |
2020-05-18 | Linear inviscid damping for shear flows near Couette in the 2D stably stratified regime | We investigate the linear stability of shears near the Couette flow for a
class of 2D incompressible stably stratified fluids. Our main result consists
of nearly optimal decay rates for perturbations of stationary states whose
velocities are monotone shear flows $(U(y),0)$ and have an exponential density
profile. In th... | 2005.09058v2 |
2020-05-19 | High-redshift Damped Ly-alpha Absorbing Galaxy Model Reproducing the N(HI)-Z Distribution | We investigate how damped Lyman-$\alpha$ absorbers (DLAs) at z ~ 2-3,
detected in large optical spectroscopic surveys of quasars, trace the
population of star-forming galaxies. Building on previous results, we construct
a model based on observed and physically motivated scaling relations in order
to reproduce the bivar... | 2005.09660v1 |
2020-05-20 | Dynamical phase transitions in dissipative quantum dynamics with quantum optical realization | We study dynamical phase transitions (DPT) in the driven and damped Dicke
model, realizable for example by a driven atomic ensemble collectively coupled
to a damped cavity mode. These DPTs are characterized by non-analyticities of
certain observables, primarily the overlap of time evolved and initial state.
Even though... | 2005.10013v2 |
2020-05-21 | The critical exponent for nonlinear damped $σ$-evolution equations | In this paper, we derive suitable optimal $L^p-L^q$ decay estimates, $1\leq
p\leq q\leq \infty$, for the solutions to the $\sigma$-evolution equation,
$\sigma>1$, with structural damping and power nonlinearity $|u|^{1+\alpha}$ or
$|u_t|^{1+\alpha}$, \[ u_{tt}+(-\Delta)^\sigma u +(-\Delta)^\theta
u_t=\begin{cases} |u|^{... | 2005.10946v1 |
2020-05-22 | Particle pairs and trains in inertial microfluidics | Staggered and linear multi-particle trains constitute characteristic
structures in inertial microfluidics. Using lattice-Boltzmann simulations, we
investigate their properties and stability, when flowing through microfluidic
channels. We confirm the stability of cross-streamline pairs by showing how
they contract or ex... | 2005.12701v2 |
2020-05-20 | Dynamic Peach-Koehler self-force, inertia, and radiation damping of a regularized dislocation | The elastodynamic Peach-Koehler force is computed for a fully-regularized
straight dislocation with isotropic core in continuum isotropic elastic
elasticity, in compact forms involving partial mass or impulsion functions
relative to shear and compressional waves. The force accounts for both dynamic
radiation damping an... | 2005.12704v2 |
2020-05-27 | Experimental diagnostics of entanglement swapping by a collective entanglement test | The paper reports on experimental diagnostics of entanglement swapping
protocol by means of collective entanglement witness. Our approach is suitable
to detect disturbances occurring in the preparation of quantum states, quantum
communication channel and imperfect Bell-state projection. More specifically we
demonstrate... | 2005.13292v2 |
2020-05-27 | Magnon antibunching in a nanomagnet | We investigate the correlations of magnons inside a nanomagnet and identify a
regime of parameters where the magnons become antibunched, i.e., where there is
a large probability for occupation of the single-magnon state. This antibunched
state is very different from magnons at thermal equilibrium and
microwave-driven c... | 2005.13637v1 |
2020-05-31 | Existence and uniqueness of strong solutions for the system of interaction between a compressible Navier-Stokes-Fourier fluid and a damped plate equation | The article is devoted to the mathematical analysis of a fluid-structure
interaction system where the fluid is compressible and heat conducting and
where the structure is deformable and located on a part of the boundary of the
fluid domain. The fluid motion is modeled by the compressible
Navier-Stokes-Fourier system an... | 2006.00488v1 |
2020-06-03 | Giant voltage control of spin Hall nano-oscillator damping | Spin Hall nano-oscillators (SHNOs) are emerging spintronic devices for
microwave signal generation and oscillator based neuromorphic computing
combining nano-scale footprint, fast and ultra-wide microwave frequency
tunability, CMOS compatibility, and strong non-linear properties providing
robust large-scale mutual sync... | 2006.02151v1 |
2020-06-08 | Rogue wave, interaction solutions to the KMM system | In this paper, the consistent tanh expansion (CTE) method and the truncated
Painlev$\acute{\rm e}$ analysis are applied to the Kraenkel-Manna-Merle (KMM)
system, which describes propagation of short wave in ferromagnets. Two series
of analytic solutions of the original KMM system (free of damping effect) are
obtained v... | 2006.04312v1 |
2020-06-10 | Interpolation between Residual and Non-Residual Networks | Although ordinary differential equations (ODEs) provide insights for
designing network architectures, its relationship with the non-residual
convolutional neural networks (CNNs) is still unclear. In this paper, we
present a novel ODE model by adding a damping term. It can be shown that the
proposed model can recover bo... | 2006.05749v4 |
2020-06-15 | Multimode cold-damping optomechanics with delayed feedback | We investigate the role of time delay in cold-damping optomechanics with
multiple mechanical resonances. For instantaneous electronic response, it was
recently shown in \textit{Phys. Rev. Lett. \textbf{123}, 203605 (2019)}, that a
single feedback loop is sufficient to simultaneously remove thermal noise from
many mecha... | 2006.08430v2 |
2020-06-12 | Analytic solution of the SEIR epidemic model via asymptotic approximant | An analytic solution is obtained to the SEIR Epidemic Model. The solution is
created by constructing a single second-order nonlinear differential equation
in $\ln S$ and analytically continuing its divergent power series solution such
that it matches the correct long-time exponential damping of the epidemic
model. This... | 2006.09818v2 |
2020-06-20 | On The Energy Transfer To High Frequencies In The Damped/Driven Nonlinear Schrödinger Equation (Extended Version) | We consider a damped/driven nonlinear Schr\"odinger equation in an $n$-cube
$K^{n}\subset\mathbb{R}^n$, $n$ is arbitrary, under Dirichlet boundary
conditions \[ u_t-\nu\Delta u+i|u|^2u=\sqrt{\nu}\eta(t,x),\quad x\in
K^{n},\quad u|_{\partial K^{n}}=0, \quad \nu>0, \] where $\eta(t,x)$ is a
random force that is white in ... | 2006.11518v2 |
2020-06-23 | The Contour Method: a new approach to finding modes of non-adiabatic stellar pulsations | The contour method is a new approach to calculating the non-adiabatic
pulsation frequencies of stars. These frequencies can be found by solving for
the complex roots of a characteristic equation constructed from the linear
non-adiabatic stellar pulsation equations. A complex-root solver requires an
initial trial freque... | 2006.13223v2 |
2020-06-24 | The Complex Permeability of Split-Ring Resonator Arrays Measured at Microwave Frequencies | We have measured the relative permeability of split-ring resonator (SRR)
arrays used in metamaterials designed to have $\mu^\prime< 0$ over a narrow
range of microwave frequencies. The SRR arrays were loaded into the bore of a
loop-gap resonator (LGR) and reflection coefficient measurements were used to
determine both ... | 2006.13861v1 |
2020-06-25 | Sharp decay estimates and asymptotic behaviour for 3D magneto-micropolar fluids | We characterize the $L^2$ decay rate of solutions to the 3D
magneto-micropolar system in terms of the decay character of the initial datum.
Due to a linear damping term, the micro-rotational field has a faster decay
rate. We also address the asymptotic behaviour of solutions by comparing them
to solutions to the linear... | 2006.14427v2 |
2020-06-27 | Measurement-Based Estimation of System State Matrix for AC Power Systems with Integrated VSCs | In this paper, a wide-area measurement system (WAMS)-based method is proposed
to estimate the system state matrix for AC system with integrated voltage
source converters (VSCs) and identify the electromechanical modes. The proposed
method is purely model-free, requiring no knowledge of accurate network
topology and sys... | 2006.15244v1 |
2020-06-29 | Collective excitations in spin-polarized bilayer graphene | We calculate the plasmon frequency and damping rate of plasma oscillations in
a spin-polarized BLG system. Using the long wavelength approximation for
dynamical dielectric function, we obtain an analytical expression for plasmon
frequency showing that the degree of spin polarization P has negligible effect
on the long ... | 2006.16042v2 |
2020-06-29 | Quadratic optomechanical cooling of a cavity-levitated nanosphere | We report on cooling the center-of-mass motion of a nanoparticle due to a
purely quadratic coupling between its motion and the optical field of a high
finesse cavity. The resulting interaction gives rise to a Van der Pol nonlinear
damping, which is analogous to conventional parametric feedback where the
cavity provides... | 2006.16103v1 |
2020-07-01 | Entanglement of quantum oscillators coupled to different heat baths | We study the non-equilibrium dynamics of two coupled oscillators interacting
with their own heat baths of quantum scalar fields at different temperature
$T_1$ and $T_2$ with bilinear couplings between them. We particularly focus on
the entanglement or inseparability property of their quantum states. The
critical temper... | 2007.00288v2 |
2020-07-01 | Stabilization of the critical and subcritical semilinear inhomogeneous and anisotropic elastic wave equation | {\bf Abstract} \,\,We prove exponential decay of the critical and subcritical
semilinear inhomogeneous and anisotropic elastic wave equation with locally
distributed damping on bounded domain. One novelty compared to previous
results, is to give a checkable condition of the inhomogeneous and anisotropic
medias. Another... | 2007.00813v1 |
2020-07-06 | Collective excitations and universal broadening of cyclotron absorption in Dirac semimetals in a quantizing magnetic field | The spectrum of electromagnetic collective excitations in Dirac semimetals
placed in a quantizing magnetic field is considered. We have found the Landau
damping regions using the energy and momentum conservation law for allowed
transitions between one-particle states of electron excitations. Analysis of
dispersion equa... | 2007.02979v1 |
2020-07-06 | Fast convex optimization via a third-order in time evolution equation: TOGES-V an improved version of TOGES | In a Hilbert space setting H, for convex optimization, we analyze the fast
convergence properties as t tends to infinity of the trajectories generated by
a third-order in time evolution system. The function f to minimize is supposed
to be convex, continuously differentiable, with a nonempty set of minimizers.
It enters... | 2007.03062v1 |
2020-08-13 | Using Machine Learning to Find Ghostly Damped Ly$α$ Systems in SDSS DR14 | We report the discovery of 59 new ghostly absorbers from the Sloan Digital
Sky Survey (SDSS) Data Release 14 (DR14). These absorbers, with $z_{\rm
abs}$$\sim$$z_{\rm QSO}$, reveal no Ly$\alpha$ absorption, and they are mainly
identified through the detection of strong metal absorption lines in the
spectra. The number o... | 2008.05910v1 |
2020-08-14 | Testing Dissipative Collapse Models with a Levitated Micromagnet | We present experimental tests of dissipative extensions of spontaneous wave
function collapse models based on a levitated micromagnet with ultralow
dissipation. The spherical micromagnet, with radius $R=27$ $\mu$m, is levitated
by Meissner effect in a lead trap at $4.2$ K and its motion is detected by a
SQUID. We perfo... | 2008.06245v2 |
2020-08-15 | $L^1$-convergence to generalized Barenblatt solution for compressible Euler equations with time-dependent damping | The large time behavior of entropy solution to the compressible Euler
equations for polytropic gas (the pressure $p(\rho)=\kappa\rho^{\gamma},
\gamma>1$) with time dependent damping like $-\frac{1}{(1+t)^\lambda}\rho u$
($0<\lambda<1$) is investigated. By introducing an elaborate iterative method
and using the intensiv... | 2008.06704v1 |
2020-08-21 | Structure preserving algorithms for simulation of linearly damped acoustic systems | Energy methods for constructing time-stepping algorithms are of increased
interest in application to nonlinear problems, since numerical stability can be
inferred from the conservation of the system energy. Alternatively, symplectic
integrators may be constructed that preserve the symplectic form of the system.
This me... | 2008.09479v1 |
2020-08-24 | The move from Fujita to Kato type exponent for a class of semilinear evolution equations with time-dependent damping | In this paper, we derive suitable optimal $L^p-L^q$ decay estimates, $1\leq
p\leq 2\leq q\leq \infty$, for the solutions to the $\sigma$-evolution
equation, $\sigma>1$, with scale-invariant time-dependent damping and power
nonlinearity~$|u|^p$, \[ u_{tt}+(-\Delta)^\sigma u + \frac{\mu}{1+t} u_t=
|u|^{p}, \] where $\mu>... | 2008.10374v1 |
2020-09-01 | On the decay in $W^{1,\infty}$ for the 1D semilinear damped wave equation on a bounded domain | In this paper we study a semilinear wave equation with nonlinear,
time-dependent damping in one space dimension. For this problem, we prove a
well-posedness result in $W^{1,\infty}$ in the space-time domain $(0,1)\times
[0,+\infty)$. Then we address the problem of the time-asymptotic stability of
the zero solution and ... | 2009.00731v2 |
2020-09-08 | Nanomechanical damping via electron-assisted relaxation of two-level systems | We report on measurements of dissipation and frequency noise at millikelvin
temperatures of nanomechanical devices covered with aluminum. A clear excess
damping is observed after switching the metallic layer from superconducting to
the normal state with a magnetic field. Beyond the standard model of internal
tunneling ... | 2009.03804v3 |
2020-09-10 | Inclination damping on Callisto | Callisto is thought to possess a subsurface ocean, which will dissipate
energy due to obliquity tides. This dissipation should have damped any
primordial inclination within 1 Gyr - and yet Callisto retains a present-day
inclination. We argue that Callisto's inclination and eccentricity were both
excited in the relative... | 2009.05002v1 |
2020-09-25 | Sound in a system of chiral one-dimensional fermions | We consider a system of one-dimensional fermions moving in one direction,
such as electrons at the edge of a quantum Hall system. At sufficiently long
time scales the system is brought to equilibrium by weak interactions between
the particles, which conserve their total number, energy, and momentum. Time
evolution of t... | 2009.12364v1 |
2020-09-30 | Dynamical properties of a driven dissipative dimerized $S = 1/2$ chain | We consider the dynamical properties of a gapped quantum spin system coupled
to the electric field of a laser, which drives the resonant excitation of
specific phonon modes that modulate the magnetic interactions. We deduce the
quantum master equations governing the time-evolution of both the lattice and
spin sectors, ... | 2009.14805v2 |
2020-10-01 | Avoiding coherent errors with rotated concatenated stabilizer codes | Coherent errors, which arise from collective couplings, are a dominant form
of noise in many realistic quantum systems, and are more damaging than oft
considered stochastic errors. Here, we propose integrating stabilizer codes
with constant-excitation codes by code concatenation. Namely, by concatenating
an $[[n,k,d]]$... | 2010.00538v2 |
2020-10-02 | Parametric instability in a free evolving warped protoplanetary disc | Warped accretion discs of low viscosity are prone to hydrodynamic instability
due to parametric resonance of inertial waves as confirmed by local
simulations. Global simulations of warped discs, using either smoothed particle
hydrodynamics (SPH) or grid-based codes, are ubiquitous but no such instability
has been seen.... | 2010.00862v2 |
2020-10-15 | Dephasing in strongly disordered interacting quantum wires | Many-body localization is a fascinating theoretical concept describing the
intricate interplay of quantum interference, i.e. localization, with many-body
interaction induced dephasing. Numerous computational tests and also several
experiments have been put forward to support the basic concept. Typically,
averages of ti... | 2010.07919v1 |
2020-10-19 | Modified EP MIMO Detection Algorithm with Deep Learning Parameters Selection | Expectation Propagation (EP)-based Multiple-Input Multiple-Output (MIMO)
detector is regarded as a state-of-the-art MIMO detector because of its
exceptional performance. However, we find that the EP MIMO detector cannot
guarantee to achieve the optimal performance due to the empirical parameter
selection, including ini... | 2010.09183v2 |
2020-10-23 | A damped point-vortex model for polar-core spin vortices in a ferromagnetic spin-1 Bose-Einstein condensate | Ferromagnetic spin-1 Bose-Einstein condensates in the broken-axisymmetric
phase support polar-core spin vortices (PCVs), which are intimately linked to
the nonequilibrium dynamics of the system. For a purely transversely magnetized
system, the Turner point-vortex model predicts that PCVs behave like massive
charged par... | 2010.12154v1 |
2020-10-26 | Viscous damping of chiral dynamos in the early universe | Chiral dynamo converting asymmetry between right and left-handed leptons in
the early universe into helical magnetic field has been proposed as a possible
cosmological magnetogenesis scenario. We show that this mechanism is strongly
affected by viscous damping of primordial plasma motions excited by the dynamo.
This ef... | 2010.13571v1 |
2020-10-28 | Construction of quasimodes for non-selfadjoint operators via propagation of Hagedorn wave-packets | We construct quasimodes for some non-selfadjoint semiclassical operators at
the boundary of the pseudo-spectrum using propagation of Hagedorn wave-packets.
Assuming that the imaginary part of the principal symbol of the operator is
non-negative and vanishes on certain points of the phase-space satisfying a
subelliptic ... | 2010.14967v5 |
2020-10-28 | Spin-valley collective modes of the electron liquid in graphene | We develop the theory of collective modes supported by a Fermi liquid of
electrons in pristine graphene. Under reasonable assumptions regarding the
electron-electron interaction, all the modes but the plasmon are over-damped.
In addition to the $SU(2)$ symmetric spin mode, these include also the valley
imbalance modes ... | 2010.15154v2 |
2020-10-29 | Collisionless sound of bosonic superfluids in lower dimensions | The superfluidity of low-temperature bosons is well established in the
collisional regime. In the collisionless regime, however, the presence of
superfluidity is not yet fully clarified, in particular in lower spatial
dimensions. Here we compare the Vlasov-Landau equation, which does not take
into account the superflui... | 2010.15724v3 |
2020-11-02 | Constraining the Halo Mass of Damped Ly$α$ Absorption Systems (DLAs) at $z=2-3.5$ using the Quasar-CMB Lensing Cross-correlation | We study the cross correlation of damped Ly$\alpha$ systems (DLAs) and their
background quasars, using the most updated DLA catalog and the Planck 2018 CMB
lensing convergence field. Our measurement suggests that the DLA bias $b_{\rm
DLA}$ is smaller than $3.1$, corresponding to $\log(M/M_\odot h^{-1})\leq 12.3$
at a c... | 2011.01234v1 |
2020-11-07 | Bresse-Timoshenko type systems with thermodiffusion effects: Well-possedness, stability and numerical results | Bresse-Timoshenko beam model with thermal, mass diffusion and theormoelastic
effects is studied. We state and prove the well-posedness of problem. The
global existence and uniqueness of the solution is proved by using the
classical Faedo-Galerkin approximations along with two a priori estimates. We
prove an exponential... | 2011.03680v2 |
2020-11-09 | Impedance Optimization for Uncertain Contact Interactions Through Risk Sensitive Optimal Control | This paper addresses the problem of computing optimal impedance schedules for
legged locomotion tasks involving complex contact interactions. We formulate
the problem of impedance regulation as a trade-off between disturbance
rejection and measurement uncertainty. We extend a stochastic optimal control
algorithm known ... | 2011.04684v2 |
2020-11-12 | A priori bounds for rough differential equations with a non-linear damping term | We consider a rough differential equation with a non-linear damping drift
term: \begin{align*} dY(t) = - |Y|^{m-1} Y(t) dt + \sigma(Y(t)) dX(t),
\end{align*} where $X$ is a branched rough path of arbitrary regularity $\alpha
>0$, $m>1$ and where $\sigma$ is smooth and satisfies an $m$ and
$\alpha$-dependent growth prop... | 2011.06645v4 |
2020-11-14 | Oscillating charge currents of one-dimensional Hubbard model in an electric field | The time evolution properties of charge current for the one-dimensional
Hubbard model in an electric field have been studied in a rigorous manner. We
find that there is a complete and orthonormal set of time-evolution states for
which the charge current can only keep zero or oscillate constantly, differing
from the pos... | 2011.07220v2 |
2020-12-07 | Damped Neutrino Oscillations in a Conformal Coupling Model | Flavor transitions of Neutrinos with a nonstandard interaction are studied. A
scalar field is conformally coupled to matter and neutrinos. This interaction
alters the neutrino effective mass and its wavefunction leading to a damping
factor, causing deficits in the probability densities and affecting the
oscillation pha... | 2012.03633v3 |
2020-12-10 | Wakefield decay in a radially bounded plasma due to formation of electron halo | There is a new effect that can limit the lifetime of a weakly nonlinear
wakefield in a radially bounded plasma. If the drive beam is narrow, some of
the plasma electrons fall out of the collective motion and leave the plasma
radially, forming a negatively charged halo around it. These electrons
repeatedly return to the... | 2012.05676v1 |
2020-12-17 | Magnetic equivalent of electric superradiance: radiative damping in yttrium-iron-garnet films | A dense system of independent oscillators, connected only by their
interaction with the same cavity excitation mode, will radiate coherently,
which effect is termed superradiance. In several cases, especially if the
density of oscillators is high, the superradiance may dominate the intrinsic
relaxation processes. This ... | 2012.09440v1 |
2020-12-21 | Dissipation-driven strange metal behavior | Anomalous metallic properties are often observed in the proximity of quantum
critical points (QCPs), with violation of the Fermi Liquid paradigm. We propose
a scenario where, due to the presence of a nearby QCP, dynamical fluctuations
of the order parameter with finite correlation length mediate a nearly
isotropic scat... | 2012.11697v1 |
2020-12-22 | Damped perturbations of systems with centre-saddle bifurcation | An autonomous system of ordinary differential equations in the plane with a
centre-saddle bifurcation is considered. The influence of time damped
perturbations with power-law asymptotics is investigated. The particular
solutions tending at infinity to the fixed points of the limiting system are
considered. The stabilit... | 2012.12116v1 |
2020-12-22 | Mechanical parametric feedback-cooling for pendulum-based gravity experiments | Gravitational forces that oscillate at audio-band frequencies are measured
with masses suspended as pendulums that have resonance frequencies even lower.
If the pendulum is excited by thermal energy or by seismic motion of the
environment, the measurement sensitivity is reduced. Conventionally, this
problem is mitigate... | 2012.12158v2 |
2020-12-23 | The fate of nonlinear perturbations near the QCD critical point | The impact of the QCD critical point on the propagation of nonlinear waves
has been studied. The effects have been investigated within the scope of
second-order causal dissipative hydrodynamics by incorporating the critical
point into the equation of state, and the scaling behaviour of transport
coefficients and of the... | 2012.12668v3 |
2020-12-28 | A weakly nonlinear wave equation for damped acoustic waves with thermodynamic non-equilibrium effects | The problem of propagating nonlinear acoustic waves is considered; the
solution to which, both with and without damping, having been obtained to-date
starting from the Navier-Stokes-Duhem equations together with the continuity
and thermal conduction equation. The novel approach reported here adopts
instead, a discontin... | 2012.14399v2 |
2020-12-28 | Reliability optimization of friction-damped systems using nonlinear modes | A novel probabilistic approach for the design of mechanical structures with
friction interfaces is proposed. The objective function is defined as the
probability that a specified performance measure of the forced vibration
response is achieved subject to parameter uncertainties. The practicability of
the approach regar... | 2012.14466v1 |
2021-01-04 | Fast flavor oscillations in dense neutrino media with collisions | We investigate the impact of the nonzero neutrino splitting and elastic
neutrino-nucleon collisions on fast neutrino oscillations. Our calculations
confirm that a small neutrino mass splitting and the neutrino mass hierarchy
have very little effect on fast oscillation waves. We also demonstrate
explicitly that fast osc... | 2101.01278v2 |
2021-01-15 | Efficient Spin-Orbit Torque Generation in Semiconducting WTe2 with Hopping Transport | Spin-orbit torques (SOTs) from transition metal dichalcogenides systems
(TMDs) in conjunction with ferromagnetic materials are recently attractive in
spintronics for their versatile features. However, most of the previously
studied crystalline TMDs are prepared by mechanical exfoliation, which limits
their potentials f... | 2101.06047v1 |
2021-01-25 | A modified Kačanov iteration scheme with application to quasilinear diffusion models | The classical Ka\v{c}anov scheme for the solution of nonlinear variational
problems can be interpreted as a fixed point iteration method that updates a
given approximation by solving a linear problem in each step. Based on this
observation, we introduce a modified Ka\v{c}anov method, which allows for
(adaptive) damping... | 2101.10137v3 |
2021-01-29 | One-parameter robust global frequency estimator for slowly varying amplitude and noisy oscillations | Robust online estimation of oscillation frequency belongs to classical
problems of system identification and adaptive control. The given harmonic
signal can be noisy and with varying amplitude at the same time, as in the case
of damped vibrations. A novel robust frequency-estimation algorithm is proposed
here, motivate... | 2101.12497v3 |
2021-01-29 | Quarter and Full Car Models Optimisation of Passive and Active Suspension System Using Genetic Algorithm | This study evaluates a suspension design of a passenger car to obtain maximum
rider's comfort when the vehicle is subjected to different road profile or road
surface condition. The challenge will be on finding a balance between the
rider's comfort and vehicle handling to optimize design parameters. The study
uses a sim... | 2101.12629v1 |
2021-02-01 | Performance and limits of feedback cooling methods for levitated oscillators: a direct comparison | Cooling the centre-of-mass motion is an important tool for levitated
optomechanical systems, but it is often not clear which method can practically
reach lower temperatures for a particular experiment. We directly compare the
parametric and velocity feedback damping methods, which are used extensively
for cooling the m... | 2102.01060v3 |
2021-02-16 | A homogenized damping model for the propagation of elastic wave in a porous solid | This paper develops an averaging technique based on the combination of the
eigenfunction expansion method and the collaboration method to investigate the
multiple scattering effect of the SH wave propagation in a porous medium. The
semi-analytical averaging technique is conducted using Monto Carlo method to
understand ... | 2102.08334v1 |
2021-02-11 | Semi-linear Poisson-mediated Flocking in a Cucker-Smale Model | We propose a family of compactly supported parametric interaction functions
in the general Cucker-Smale flocking dynamics such that the mean-field
macroscopic system of mass and momentum balance equations with non-local
damping terms can be converted from a system of partial integro-differential
equations to an augment... | 2102.08772v1 |
2021-02-22 | Robust formation of nanoscale magnetic skyrmions in easy-plane thin film multilayers with low damping | We experimentally demonstrate the formation of room-temperature skyrmions
with radii of about 25\,nm in easy-plane anisotropy multilayers with
interfacial Dzyaloshinskii-Moriya interaction (DMI). We detect the formation of
individual magnetic skyrmions by magnetic force microscopy and find that the
skyrmions are stable... | 2102.11117v1 |
2021-02-22 | Asymptotics of solutions with a compactness property for the nonlinear damped Klein-Gordon equation | We consider the nonlinear damped Klein-Gordon equation \[
\partial_{tt}u+2\alpha\partial_{t}u-\Delta u+u-|u|^{p-1}u=0 \quad \text{on} \ \
[0,\infty)\times \mathbb{R}^N \] with $\alpha>0$, $2 \le N\le 5$ and energy
subcritical exponents $p>2$. We study the behavior of solutions for which it is
supposed that only one non... | 2102.11178v1 |
2021-02-23 | The tipping effect of delayed interventions on the evolution of COVID-19 incidence | We combine infectious disease transmission and the non-pharmaceutical
intervention (NPI) response to disease incidence into one closed model
consisting of two coupled delay differential equations for the incidence rate
and the time-dependent reproduction number. The model contains three free
parameters, the initial rep... | 2102.11750v1 |
2021-03-01 | Dynamics of a ring of three unidirectionally coupled Duffing oscillators with time-dependent damping | We study dynamics of a ring of three unidirectionally coupled double-well
Duffing oscillators for three different values of the damping coefficient:
fixed dumping, proportional to time, and inversely proportional to time. The
dynamics in all cases is analyzed through time series, Fourier and Hilbert
transforms, Poincar... | 2103.01297v1 |
2021-03-06 | Deep learning stochastic processes with QCD phase transition | It is non-trivial to recognize phase transitions and track dynamics inside a
stochastic process because of its intrinsic stochasticity. In this paper, we
employ the deep learning method to classify the phase orders and predict the
damping coefficient of fluctuating systems under Langevin's description. As a
concrete se... | 2103.04090v1 |
2021-03-12 | Longitudinal Modes of Bunched Beams with Weak Space Charge | Longitudinal collective modes of a bunched beam with a repulsive inductive
impedance (the space charge below transition or the chamber inductance above
it) are analytically described by means of reduction of the linearized Vlasov
equation to a parameter-less integral equation. For any multipolarity, the
discrete part o... | 2103.07523v4 |
2021-03-13 | Microscopic Calculation of Spin Torques in Textured Antiferromagnets | A microscopic calculation is presented for the spin-transfer torques (STT)
and damping torques in metallic antiferromagnets (AF). It is found that the
sign of the STT is opposite to that in ferromagnets because of the AF transport
character, and the current-to-STT conversion factor is enhanced near the AF gap
edge. The... | 2103.07634v1 |
2021-03-13 | Dissipative structures in a parametrically driven dissipative lattice: chimera, localized disorder, continuous-wave, and staggered state | Discrete dissipative coupled systems exhibit complex behavior such as chaos,
spatiotemporal intermittence, chimera among others. We construct and
investigate chimera states, in the form of confined stationary and dynamical
states in a chain of parametrically driven sites with onsite damping and cubic
nonlinearity. The ... | 2103.07748v1 |
2021-03-16 | On an inverse problem of nonlinear imaging with fractional damping | This paper considers the attenuated Westervelt equation in pressure
formulation. The attenuation is by various models proposed in the literature
and characterised by the inclusion of non-local operators that give power law
damping as opposed to the exponential of classical models. The goal is the
inverse problem of rec... | 2103.08965v1 |
2021-03-17 | Tunable exciton-optomechanical coupling in suspended monolayer MoSe2 | The strong excitonic effect in monolayer transition metal dichalcogenide
(TMD) semiconductors has enabled many fascinating light-matter interaction
phenomena. Examples include strongly coupled exciton-polaritons and nearly
perfect atomic monolayer mirrors. The strong light-matter interaction also
opens the door for dyn... | 2103.09897v2 |
2021-03-18 | Perturbation theory for solitons of the Fokas--Lenells equation : Inverse scattering transform approach | We present perturbation theory based on the inverse scattering transform
method for solitons described by an equation with the inverse linear dispersion
law $\omega\sim 1/k$, where $\omega$ is the frequency and $k$ is the wave
number, and cubic nonlinearity. This equation, first suggested by Davydova and
Lashkin for de... | 2103.10090v1 |
2021-04-07 | Indirect stability of a multidimensional coupled wave equations with one locally boundary fractional damping | In this work, we consider a system of multidimensional wave equations coupled
by velocities with one localized fractional boundary damping. First, using a
general criteria of Arendt- Batty, by assuming that the boundary control region
satisfy some geometric conditions, under the equality speed propagation and the
coupl... | 2104.03389v1 |
2021-04-10 | Free and forced vibrations of damped locally-resonant sandwich beams | This paper addresses the dynamics of locally-resonant sandwich beams, where
multi-degree-of-freedom viscously-damped resonators are periodically
distributed within the core matrix. Using an equivalent single-layer Timoshenko
beam model coupled with mass-spring-dashpot subsystems representing the
resonators, two solutio... | 2104.04870v1 |
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