publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2019-05-20 | Quantum parameter-estimation of frequency and damping of a harmonic-oscillator | We determine the quantum Cram\'er-Rao bound for the precision with which the
oscillator frequency and damping constant of a damped quantum harmonic
oscillator in an arbitrary Gaussian state can be estimated. This goes beyond
standard quantum parameter estimation of a single mode Gaussian state for which
typically a mod... | 1905.08288v1 |
2019-11-08 | Giant anisotropy of Gilbert damping in a Rashba honeycomb antiferromagnet | Giant Gilbert damping anisotropy is identified as a signature of strong
Rashba spin-orbit coupling in a two-dimensional antiferromagnet on a honeycomb
lattice. The phenomenon originates in spin-orbit induced splitting of
conduction electron subbands that strongly suppresses certain spin-flip
processes. As a result, the... | 1911.03408v1 |
2020-03-25 | Sharp ultimate velocity bounds for the general solution of some linear second order evolution equation with damping and bounded forcing | We consider a class of linear second order differential equations with
damping and external force. We investigate the link between a uniform bound on
the forcing term and the corresponding ultimate bound on the velocity of
solutions, and we study the dependence of that bound on the damping and on the
"elastic force".
... | 2003.11579v1 |
2020-08-18 | Survey of 360$^{\circ}$ domain walls in magnetic heterostructures: topology, chirality and current-driven dynamics | Chirality and current-driven dynamics of topologically nontrivial
360$^{\circ}$ domain walls (360DWs) in magnetic heterostructures (MHs) are
systematically investigated. For MHs with normal substrates, the static 360DWs
are N\'{e}el-type with no chirality. While for those with heavy-metal
substrates, the interfacial Dz... | 2008.08196v1 |
2021-11-26 | Transition from order to chaos in reduced quantum dynamics | We study a damped kicked top dynamics of a large number of qubits ($N
\rightarrow \infty$) and focus on an evolution of a reduced single-qubit
subsystem. Each subsystem is subjected to the amplitude damping channel
controlled by the damping constant $r\in [0,1]$, which plays the role of the
single control parameter. In... | 2111.13477v1 |
2022-01-12 | Local Well-Posedness of the Gravity-Capillary Water Waves System in the Presence of Geometry and Damping | We consider the gravity-capillary water waves problem in a domain $\Omega_t
\subset \mathbb{T} \times \mathbb{R}$ with substantial geometric features.
Namely, we consider a variable bottom, smooth obstacles in the flow and a
constant background current. We utilize a vortex sheet model introduced by
Ambrose, et. al. in ... | 2201.04713v2 |
2023-05-09 | Lifespan estimates for semilinear damped wave equation in a two-dimensional exterior domain | Lifespan estimates for semilinear damped wave equations of the form
$\partial_t^2u-\Delta u+\partial_tu=|u|^p$ in a two dimensional exterior domain
endowed with the Dirichlet boundary condition are dealt with. For the critical
case of the semilinear heat equation $\partial_tv-\Delta v=v^2$ with the
Dirichlet boundary c... | 2305.05124v1 |
2023-09-25 | Linearly implicit exponential integrators for damped Hamiltonian PDEs | Structure-preserving linearly implicit exponential integrators are
constructed for Hamiltonian partial differential equations with linear constant
damping. Linearly implicit integrators are derived by polarizing the polynomial
terms of the Hamiltonian function and portioning out the nonlinearly of
consecutive time step... | 2309.14184v2 |
2024-03-10 | Linear-in-temperature resistivity and Planckian dissipation arise in a stochastic quantization model of Cooper pairs | We suppose that a Cooper pair (CP) will experience a damping force exerted by
the condensed matter. A Langevin equation of a CP in two dimensional condensed
matter is established. Following a method similar to Nelson's stochastic
mechanics, generalized Schr\"{o}dinger equation of a CP in condensed matter is
derived. If... | 2403.09710v1 |
2018-07-31 | Comparative study of methodologies to compute the intrinsic Gilbert damping: interrelations, validity and physical consequences | Relaxation effects are of primary importance in the description of magnetic
excitations, leading to a myriad of methods addressing the phenomenological
damping parameters. In this work, we consider several well-established forms of
calculating the intrinsic Gilbert damping within a unified theoretical
framework, mappin... | 1807.11808v3 |
2019-11-05 | Observation of Nanoscale Opto-Mechanical Molecular Damping; Origin of Spectroscopic Contrast in Photo Induced Force Microscopy | We experimentally investigated the contrast mechanism of infrared
photoinduced force microscopy (PiFM) for recording vibrational resonances.
Extensive experiments have demonstrated that spectroscopic contrast in PiFM is
mediated by opto-mechanical damping of the cantilever oscillation as the
optical wavelength is scann... | 1911.05190v1 |
2024-03-28 | Constants of Motion for Conserved and Non-conserved Dynamics | This paper begins with a dynamical model that was obtained by applying a
machine learning technique (FJet) to time-series data; this dynamical model is
then analyzed with Lie symmetry techniques to obtain constants of motion. This
analysis is performed on both the conserved and non-conserved cases of the 1D
and 2D harm... | 2403.19418v1 |
2003-06-30 | Damped oscillatory integrals and boundedness of maximal operators associated to mixed homogeneous hypersurfaces | We study the boundedness problem for maximal operators in 3-dimensional
Euclidean space associated to hypersurfaces given as the graph of $c+f$, where
$f$ is a mixed homogeneous function which is smooth away from the origin and
$c$ is a constant. Our result generalizes a corresponding theorem on mixed
homogeneous polyn... | 0306429v1 |
2005-07-26 | On simulations of the classical harmonic oscillator equation by difference equations | We show that any second order linear ordinary diffrential equation with
constant coefficients (including the damped and undumped harmonic oscillator
equation) admits an exact discretization, i.e., there exists a difference
equation whose solutions exactly coincide with solutions of the corresponding
differential equati... | 0507182v1 |
2012-09-08 | Evidence for anisotropic polar nanoregions in relaxor PMN: A neutron study of the elastic constants and anomalous TA phonon damping | We use neutron scattering to characterize the acoustic phonons in the relaxor
PMN and demonstrate the presence of an anisotropic damping mechanism directly
related to short-range, polar correlations. For a large range of temperatures
above Tc ~ 210, K, where dynamic polar correlations exist, acoustic phonons
propagatin... | 1209.1736v1 |
2015-11-12 | Global weak solutions to 3D compressible Navier-Stokes-Poisson equations with density-dependent viscosity | Global-in-time weak solutions to the Compressible Navier-Stokes-Poisson
equations in a three-dimensional torus for large data are considered in this
paper. The system takes into account density-dependent viscosity and
non-monotone presseur. We prove the existence of global weak solutions to NSP
equations with damping t... | 1511.03841v1 |
2015-12-03 | Lieb-Thirring inequalities on the torus | We consider the Lieb-Thirring inequalities on the d-dimensional torus with
arbitrary periods. In the space of functions with zero average with respect to
the shortest coordinate we prove the Lieb-Thirring inequalities for the
$\gamma$-moments of the negative eigenvalues with constants independent of
ratio of the period... | 1512.01160v1 |
2017-09-24 | Exceptional points in two simple textbook examples | We propose to introduce the concept of exceptional points in intermediate
courses on mathematics and classical mechanics by means of simple textbook
examples. The first one is an ordinary second-order differential equation with
constant coefficients. The second one is the well known damped harmonic
oscillator. They ena... | 1710.00067v1 |
2021-07-21 | Convergence rates for the Heavy-Ball continuous dynamics for non-convex optimization, under Polyak-Łojasiewicz condition | We study convergence of the trajectories of the Heavy Ball dynamical system,
with constant damping coefficient, in the framework of convex and non-convex
smooth optimization. By using the Polyak-{\L}ojasiewicz condition, we derive
new linear convergence rates for the associated trajectory, in terms of
objective functio... | 2107.10123v2 |
2022-05-06 | Quaternion-based attitude stabilization via discrete-time IDA-PBC | In this paper, we propose a new sampled-data controller for stabilization of
the attitude dynamics at a desired constant configuration. The design is based
on discrete-time interconnection and damping assignment (IDA) passivity-based
control (PBC) and the recently proposed Hamiltonian representation of
discrete-time no... | 2205.03086v1 |
2024-04-03 | Comment on "Machine learning conservation laws from differential equations" | In lieu of abstract, first paragraph reads: Six months after the author
derived a constant of motion for a 1D damped harmonic oscillator [1], a similar
result appeared by Liu, Madhavan, and Tegmark [2, 3], without citing the
author. However, their derivation contained six serious errors, causing both
their method and r... | 2404.02896v1 |
2003-03-13 | Vibrational sidebands and dissipative tunneling in molecular transistors | Transport through molecular devices with strong coupling to a single
vibrational mode is considered in the case where the vibration is damped by
coupling to the environment. We focus on the weak tunneling limit, for which a
rate equation approach is valid. The role of the environment can be
characterized by a frictiona... | 0303236v3 |
2001-01-16 | Nonlinear Landau damping of a plasmino in the quark-gluon plasma | On the basis of the Blaizot-Iancu equations, which are a local formulation of
the hard thermal loop (HTL) equations of motion for soft fluctuating quark and
gluon fields and their induced sources, the coupled kinetic equations for
plasminos and plasmons are obtained. The equality of matrix elements for
nonlinear scatte... | 0101167v2 |
2005-10-21 | Non-contact atomic force microscopy: Stability criterion and dynamical responses of the shift of frequency and damping signal | The aim of this article is to provide a complete analysis of the behavior of
a noncontact atomic force microscope (NC-AFM). We start with a review of the
equations of motion of a tip interacting with a surface in which the stability
conditions are first revisited for tapping mode. Adding the equations of
automatic gain... | 0510192v1 |
2008-06-09 | Relaxation Time and Relaxation Function of Quark-Gluon Plasma with Lattice QCD | We propose a method which enables a QCD-based calculation of a relaxation
time for a dissipative current in the causal and dissipative hydrodynamic
equation derived by Israel and Stewart. We point out that the Israel-Stewart
equation is not unique as a causal and dissipative hydrodynamic equation, and
the form of the c... | 0806.1481v1 |
2018-02-18 | On energy stable discontinuous Galerkin spectral element approximations of the perfectly matched layer for the wave equation | We develop a provably energy stable discontinuous Galerkin spectral element
method (DGSEM) approximation of the perfectly matched layer (PML) for the three
and two space dimensional (3D and 2D) linear acoustic wave equations, in first
order form, subject to well-posed linear boundary conditions. First, using the
well-k... | 1802.06388v1 |
2018-11-15 | Damping rate of a fermion in ultradegenerate chiral matter | We compute the damping rate of a fermion propagating in a chiral plasma when
there is an imbalance between the densities of left- and right-handed fermions,
after generalizing the hard thermal loop resummation techniques for these
systems. In the ultradegenerate limit, for very high energies the damping rate
of this ex... | 1811.06394v3 |
2020-07-19 | Global existence and convergence to the modified Barenblatt solution for the compressible Euler equations with physical vacuum and time-dependent damping | In this paper, the smooth solution of the physical vacuum problem for the one
dimensional compressible Euler equations with time-dependent damping is
considered. Near the vacuum boundary, the sound speed is $C^{1/2}$-H\"{o}lder
continuous. The coefficient of the damping depends on time, given by this form
$\frac{\mu}{(... | 2007.14802v2 |
2020-11-16 | Thresholds for loss of Landau damping in longitudinal plane | Landau damping mechanism plays a crucial role in providing single-bunch
stability in LHC, High-Luminosity LHC, other existing as well as previous and
future (like FCC) circular hadron accelerators. In this paper, the thresholds
for the loss of Landau damping (LLD) in the longitudinal plane are derived
analytically usin... | 2011.07985v1 |
2021-11-15 | Convergence Analysis of A Second-order Accurate, Linear Numerical Scheme for The Landau-Lifshitz Equation with Large Damping Parameters | A second order accurate, linear numerical method is analyzed for the
Landau-Lifshitz equation with large damping parameters. This equation describes
the dynamics of magnetization, with a non-convexity constraint of unit length
of the magnetization. The numerical method is based on the second-order
backward differentiat... | 2111.07537v1 |
2005-05-11 | Social Behaviour of Agents: Capital Markets and Their Small Perturbations | We study social behaviour of agents on capital markets when these are
perturbed by small perturbations. We use the mean field method. Social
behaviour of agents on capital markets is described: volatility of the market,
aversion constant and equilibrium states are discussed. Relaxation behaviour of
agents on the capita... | 0505086v2 |
2017-06-18 | Diffusion constant of slowly rotating black three-brane | In this paper, we take the slowly rotating black three-brane background and
perturb it by introducing a vector gauge field. We find the components of the
gauge field through Maxwell equations and Bianchi identities. Using currents
and some ansatz we find Fick's first law at long wavelength regime. An
interesting result... | 1706.05669v2 |
2023-04-24 | On elastic constants of zero-temperature amorphous solids | Elastic constants of zero-temperature amorphous solids are given as the
difference between the Born term, which results from a hypothetical affine
deformation of an amorphous solid, and a correction term which originates from
the fact that the deformation of an amorphous solid due to an applied stress
is, at the micros... | 2304.12374v1 |
2003-08-24 | Numerical analysis of quasinormal modes in nearly extremal Schwarzschild-de Sitter spacetimes | We calculate high-order quasinormal modes with large imaginary frequencies
for electromagnetic and gravitational perturbations in nearly extremal
Schwarzschild-de Sitter spacetimes. Our results show that for low-order
quasinormal modes, the analytical approximation formula in the extremal limit
derived by Cardoso and L... | 0308077v4 |
2010-12-08 | Nonequilibrium dynamics of the Holstein polaron driven by external electric field | This work represents a fundamental study of a Holstein polaron in one
dimension driven away from the ground state by a constant electric field.
Taking fully into account quantum effects we follow the time-evolution of the
system from its ground state as the constant electric field is switched on at t
= 0, until it reac... | 1012.1716v3 |
2015-06-23 | Resonant absorption of kink magnetohydrodynamic waves by a magnetic twist in coronal loops | There is ample evidence of twisted magnetic structures in the solar corona.
This motivates us to consider the magnetic twist as the cause of Alfven
frequency continuum in the coronal loops, which can support the resonant
absorption as a rapid damping mechanism for the observed coronal kink
magnetohydrodynamic (MHD) osc... | 1507.02653v4 |
2002-07-19 | Gilbert Damping in Magnetic Multilayers | We study the enhancement of the ferromagnetic relaxation rate in thin films
due to the adjacent normal metal layers. Using linear response theory, we
derive the dissipative torque produced by the s-d exchange interaction at the
ferromagnet-normal metal interface. For a slow precession, the enhancement of
Gilbert dampin... | 0207471v1 |
2003-05-21 | Magnetoresistive response of a high mobility 2DES under electromagnetic wave excitation | Oscillations of the resistance observed under electromagnetic wave excitation
in the high mobility GaAs/AlGaAs 2DES are examined as a function of the
radiation frequency and the power, utilizing an empirical lineshape based on
exponentially damped sinusoids. The fit-analysis indicates the resistance
oscillation frequen... | 0305507v2 |
2005-10-26 | Multiple electron-hole scattering effect on quasiparticle properties in a homogeneous electron gas | We present a detailed study of a contribution of the T matrix accounting for
multiple scattering between an electron and a hole to the quasiparticle
self-energy. This contribution is considered as an additional term to the GW
self-energy. The study is based on a variational solution of the T-matrix
integral equation wi... | 0510684v2 |
1995-01-03 | High temperature QCD and QED with unstable excitations | We consider the partition functions of QCD and QED at high temperature
assuming small coupling constants, and present arguments in favor of an
improved perturbative expansion in terms of unstable excitations. Our effective
propagators are derived from spectral functions with a constant width. These
spectral functions d... | 9501203v1 |
2002-06-22 | Yank and Hooke's constant group theoretically | We study the second central extension of the (1+1) Aristotle Lie.We find that
the first central extension admit four orbits on the dual of second central
extension of the (1+1) Aristotle Lie group.The generic orbit is characterised
by a Hooke's constant k and a yank y.If the physics of the orbit is studied
with respect... | 0206038v1 |
2010-11-21 | Regular and chaotic transport of discrete solitons in asymmetric potentials | Ratchet dynamics of topological solitons of the forced and damped discrete
double sine-Gordon system are studied. Directed transport occurring both in
regular and in chaotic regions of the phase space and its dependence on
damping, amplitude and frequency of the driving, asymmetry parameter, coupling
constant, has been... | 1011.4707v1 |
2011-07-13 | q-damped Oscillator and degenerate roots of constant coefficients q-difference ODE | The classical model of q-damped oscillator is introduced and solved in terms
of Jackson q-exponential function for three different cases, under-damped,
over-damped and the critical one. It is shown that in all three cases solution
is oscillating in time but is unbounded and non-periodic. By q-periodic
function modulati... | 1107.2518v1 |
2012-02-07 | The Fine Structure Constant and the CMB Damping Scale | The recent measurements of the Cosmic Microwave Background anisotropies at
arcminute angular scales performed by the ACT and SPT experiments are probing
the damping regime of CMB fluctuations. The analysis of these datasets
unexpectedly suggests that the effective number of relativistic degrees of
freedom is larger tha... | 1202.1476v1 |
2013-04-24 | Finite amplitude inhomogeneous waves in Mooney-Rivlin viscoelastic solids | New exact solutions are exhibited within the framework of finite
viscoelasticity. More precisely, the solutions correspond to finite-amplitude,
transverse, linearly-polarized, inhomogeneous motions superposed upon a finite
homogeneous static deformation. The viscoelastic body is composed of a
Mooney-Rivlin viscoelastic... | 1304.6748v1 |
2014-10-02 | Investigation of the temperature-dependence of ferromagnetic resonance and spin waves in Co2FeAl0.5Si0.5 | Co2FeAl0.5Si0.5 (CFAS) is a Heusler compound that is of interest for
spintronics applications, due to its high spin polarization and relatively low
Gilbert damping constant. In this study, the behavior of ferromagnetic
resonance as a function of temperature was investigated in CFAS, yielding a
decreasing trend of dampi... | 1410.0439v1 |
2015-12-02 | Flow of colloidal solids and fluids through constrictions: dynamical density functional theory versus simulation | Using both dynamical density functional theory and particle-resolved Brownian
dynamics simulations, we explore the flow of two-dimensional colloidal solids
and fluids driven through a linear channel with a geometric constriction. The
flow is generated by a constant external force acting on all colloids. The
initial con... | 1512.00751v1 |
2017-02-14 | Electron-nuclear coherent spin oscillations probed by spin dependent recombination | We demonstrate the detection of coherent electron-nuclear spin oscillations
related to the hyperfine interaction and revealed by the band-to-band
photoluminescence (PL) in zero external magnetic field. On the base of a
pump-probe PL experiment we measure, directly in the temporal domain, the
hyperfine constant of an el... | 1702.04129v1 |
2017-03-08 | System-Theoretic Performance Metrics for Low-Inertia Stability of Power Networks | As bulk synchronous generators in the power grid are replaced by distributed
generation interfaced through power electronics, inertia is removed from the
system, prompting concerns over grid stability. Different metrics are available
for quantifying grid stability and performance; however, no theoretical results
are av... | 1703.02646v1 |
2017-03-30 | Study of spin pumping in Co thin film vis-a-vis seed and capping layer using ferromagnetic resonance spectroscopy | We investigated the dependence of the seed [Ta/Pt, Ta/Au] and capping [Pt/Ta,
Au/Ta] layers on spin pumping effect in the ferromagnetic 3 nm thick Co thin
film using ferromagnetic resonance spectroscopy. The data is fitted with Kittel
equation to evaluate damping constant and g-factor. A strong dependence of seed
and c... | 1703.10630v1 |
2017-05-02 | The response of a Unruh-deWitt particle detector in a thin-shell wormhole spacetime | We investigate the transition probability of a Unruh-deWitt particle detector
evolving in flat space and in a wormhole spacetime, in various scenarios. In
Minkowski space, we look at the response of the detector on trajectories having
discontinuities and rapid variations, as well as the effect of finite-time
coupling. ... | 1705.00890v1 |
2017-08-11 | On the Small Mass Limit of Quantum Brownian Motion with Inhomogeneous Damping and Diffusion | We study the small mass limit (or: the Smoluchowski-Kramers limit) of a class
of quantum Brownian motions with inhomogeneous damping and diffusion. For Ohmic
bath spectral density with a Lorentz-Drude cutoff, we derive the
Heisenberg-Langevin equations for the particle's observables using a quantum
stochastic calculus ... | 1708.03685v1 |
2018-10-11 | Propagating spin waves in nanometer-thick yttrium iron garnet films: Dependence on wave vector, magnetic field strength and angle | We present a comprehensive investigation of propagating spin waves in
nanometer-thick yttrium iron garnet (YIG) films. We use broadband spin-wave
spectroscopy with integrated coplanar waveguides (CPWs) and microstrip antennas
on top of continuous and patterned YIG films to characterize spin waves with
wave vectors up t... | 1810.04973v1 |
2018-10-17 | Perpendicularly magnetized YIG films with small Gilbert damping constant and anomalous spin transport properties | The Y3Fe5O12 (YIG) films with perpendicular magnetic anisotropy (PMA) have
recently attracted a great deal of attention for spintronics applications.
Here, we report the induced PMA in the ultrathin YIG films grown on
(Gd2.6Ca0.4)(Ga4.1Mg0.25Zr0.65)O12 (SGGG) substrates by epitaxial strain
without preprocessing. Recipr... | 1810.07384v2 |
2023-09-27 | Exploring antisymmetric tensor effects on black hole shadows and quasinormal frequencies | This study explores the impact of antisymmetric tensor effects on spherically
symmetric black holes, investigating photon spheres, shadows, emission rate and
quasinormal frequencies in relation to a parameter which triggers the Lorentz
symmetry breaking. We examine these configurations without and with the
presence of ... | 2309.15778v3 |
2006-01-11 | Ab initio calculations of inelastic losses and optical constants | Ab initio approaches are introduced for calculations of inelastic losses and
vibrational damping in core level x-ray and electron spectroscopies. From the
dielectric response function we obtain system-dependent self-energies,
inelastic mean free paths, and losses due to multiple-electron excitations,
while from the dyn... | 0601241v1 |
2006-04-06 | Measurement of the complex dielectric constant of a single gold nanoparticle | A differential interference contrast microscopy technique, which employs a
photonic crystal fiber as a white-light source, is used to measure both the
real and imaginary parts of the complex dielectric constant of single 10 and 15
nm gold nanoparticles over a wavelength range of 480 to 610 nm. Noticeable
deviations fro... | 0604174v2 |
1998-03-08 | Wormholes in spacetimes with cosmological horizons | A generalisation of the asymptotic wormhole boundary condition for the case
of spacetimes with a cosmological horizon is proposed. In particular, we
consider de Sitter spacetime with small cosmological constant. The wave
functions selected by this proposal are exponentially damped in WKB
approximation when the scale fa... | 9803029v1 |
2003-08-01 | The pushing force of a propagating electromagnetic wave | The effect of the electrodynamic forces on a charged particle in a
propagating plane electromagnetic wave is investigated. First it is pointed out
that for constant fields fulfilling the radiation condition there will be an
acceleration in the direction of the Poynting vector. When oscillating fields
are considered the... | 0308007v1 |
2002-05-20 | Selection of Squeezed States via Decoherence | In the framework of Lindblad theory for open quantum systems, we calculate
the entropy of a damped quantum harmonic oscillator which is initially in a
quasi-free state. The maximally predictable states are identified as those
states producing the minimum entropy increase after a long enough time. In
general, the states... | 0205127v1 |
2007-12-17 | A single-time two-point closure based on fluid particle displacements | A new single-time two-point closure is proposed, in which the equation for
the two-point correlation between the displacement of a fluid particle and the
velocity allows one to estimate a Lagrangian timescale. This timescale is used
to specify the nonlinear damping of triple correlations in the closure. A
closed set of... | 0712.2496v1 |
2011-02-14 | Non-gaussianity in the strong regime of warm inflation | The bispectrum of scalar mode density perturbations is analysed for the
strong regime of warm inflationary models. This analysis generalises previous
results by allowing damping terms in the inflaton equation of motion that are
dependent on temperature. A significant amount of non-gaussianity emerges with
constant (or ... | 1102.2833v2 |
2012-11-15 | Bondi accretion onto cosmological black holes | In this paper we investigate a steady accretion within the Einstein-Straus
vacuole, in the presence of the cosmological constant. The dark energy damps
the mass accretion rate and --- above certain limit --- completely stops the
steady accretion onto black holes, which in particular is prohibited in the
inflation era a... | 1211.3618v2 |
2015-02-10 | Tunable subwavelength strong absorption by graphene wrapped dielectric particles | The optical absorption properties of graphene wrapped dielectric particles
have been investigated by using Mie scattering theory and exact
multi-scattering method. It is shown that subwavelength strong absorption in
infrared spectra can take place in such systems due to the excitation of
plasmon resonance in graphene. ... | 1502.02913v1 |
2015-02-25 | Barotropic FRW cosmologies with Chiellini damping in comoving time | For non-zero cosmological constant Lambda, we show that the barotropic FRW
cosmologies as worked out in the comoving time lead in the radiation-dominated
case to scale factors of identical form as for the Chiellini dissipative scale
factors in conformal time obtained recently by us in Phys. Lett. A 379 (2015)
882-887. ... | 1502.07033v2 |
2022-01-27 | Thermodynamics of the classical spin triangle | The classical spin system consisting of three spins with Heisenberg
interaction is an example of a completely integrable mechanical system. In this
paper we explicitly calculate thermodynamic quantities as density of states,
specific heat, susceptibility and spin autocorrelation functions. These
calculations are perfor... | 2201.11401v1 |
2009-10-28 | Nonlinear envelope equation and nonlinear Landau damping rate for a driven electron plasma wave | In this paper, we provide a theoretical description, and calculate, the
nonlinear frequency shift, group velocity and collionless damping rate, $\nu$,
of a driven electron plasma wave (EPW). All these quantities, whose physical
content will be discussed, are identified as terms of an envelope equation
allowing one to p... | 0910.5289v1 |
2014-10-17 | Hunting down systematics in baryon acoustic oscillations after cosmic high noon | Future dark energy experiments will require better and more accurate
theoretical predictions for the baryonic acoustic oscillations (BAO) signature
in the spectrum of cosmological perturbations. Here, we use large N-body
simulations of the \LambdaCDM Planck cosmology to study any possible systematic
shifts and damping ... | 1410.4684v2 |
2020-06-08 | Hysteretic depinning of a particle in a periodic potential: Phase diagram and criticality | We consider a massive particle driven with a constant force in a periodic
potential and subjected to a dissipative friction. As a function of the drive
and damping, the phase diagram of this paradigmatic model is well known to
present a pinned, a sliding, and a bistable regime separated by three distinct
bifurcation li... | 2006.04912v2 |
2021-06-18 | Sloshing dynamics of liquid tank with built-in buoys for wave energy harvesting | This paper proposes a novel design of liquid tank with built-in buoys for
wave energy harvesting, named the 'sloshing wave energy converter (S-WEC)'.
When the tank is oscillated by external loads (such as ocean waves), internal
liquid sloshing is activated, and the mechanical energy of sloshing waves can
be absorbed by... | 2106.10005v1 |
2017-04-13 | Stochastic Gradient Descent as Approximate Bayesian Inference | Stochastic Gradient Descent with a constant learning rate (constant SGD)
simulates a Markov chain with a stationary distribution. With this perspective,
we derive several new results. (1) We show that constant SGD can be used as an
approximate Bayesian posterior inference algorithm. Specifically, we show how
to adjust ... | 1704.04289v2 |
2004-04-13 | The Fine-structure Constant as a Probe of Chemical Evolution and AGB Nucleosynthesis in Damped Lyman-alpha Systems | Evidence from a large sample of quasar absorption-line spectra in damped
Lyman-alpha systems has suggested a possible time variation of the fine
structure constant alpha. The most statistically significant portion of this
sample involves the comparison of Mg and Fe wavelength shifts using the
many-multiplet (MM) method... | 0404257v2 |
2017-12-05 | Harnessing Electrical Power from Vortex-Induced Vibration of a Circular Cylinder | The generation of electrical power from Vortex-Induced Vibration (VIV) of a
cylinder is investigated numerically. The cylinder is free to oscillate in the
direction transverse to the incoming flow. The cylinder is attached to a magnet
that can move along the axis of a coil made from conducting wire. The magnet
and the ... | 1712.01588v1 |
2023-12-25 | IMEX-RK methods for Landau-Lifshitz equation with arbitrary damping | Magnetization dynamics in ferromagnetic materials is modeled by the
Landau-Lifshitz (LL) equation, a nonlinear system of partial differential
equations. Among the numerical approaches, semi-implicit schemes are widely
used in the micromagnetics simulation, due to a nice compromise between
accuracy and efficiency. At ea... | 2312.15654v1 |
2006-11-01 | Ferromagnetic resonance study of sputtered Co|Ni multilayers | We report on room temperature ferromagnetic resonance (FMR) studies of [$t$
Co$|2t$ Ni]$\times$N sputtered films, where $0.1 \leq t \leq 0.6$ nm. Two
series of films were investigated: films with same number of Co$|$Ni bilayer
repeats (N=12), and samples in which the overall magnetic layer thickness is
kept constant at... | 0611027v2 |
1996-04-10 | A Keck HIRES Investigation of the Metal Abundances and Kinematics of the z=2.46 Damped Lya System Toward Q0201+365 | We present high resolution ($\approx 8$ \kms) spectra of the QSO Q0201+365
obtained with HIRES, the echelle spectrograph on the 10m W.M. Keck Telescope.
Although we identify over $80\%$ of the absorption features and analyze several
of the more complex metal-line systems, we focus our analysis on the damped
\Lya system... | 9604042v1 |
2005-07-06 | The free precession and libration of Mercury | An analysis based on the direct torque equations including tidal dissipation
and a viscous core-mantle coupling is used to determine the damping time scales
of O(10^5) years for free precession of the spin about the Cassini state and
free libration in longitude for Mercury. The core-mantle coupling dominates the
dampin... | 0507117v1 |
1994-09-29 | Avalanches in the Weakly Driven Frenkel-Kontorova Model | A damped chain of particles with harmonic nearest-neighbor interactions in a
spatially periodic, piecewise harmonic potential (Frenkel-Kontorova model) is
studied numerically. One end of the chain is pulled slowly which acts as a weak
driving mechanism. The numerical study was performed in the limit of infinitely
weak ... | 9409006v1 |
2004-12-18 | Fluctuations of the Magnetization in Thin Films due to Conduction Electrons | A detailed analysis of damping and noise due to a {\it sd}-interaction in a
thin ferromagnetic film sandwiched between two large normal metal layers is
carried out. The magnetization is shown to obey in general a non-local equation
of motion which differs from the the Gilbert equation and is extended to the
non-adiabat... | 0412510v1 |
2009-04-29 | Synthetic electric fields and phonon damping in carbon nanotubes and graphene | Smoothly varying lattice strain in graphene affects the Dirac carriers
through a synthetic gauge field. When the lattice strain is time dependent, as
in connection with phononic excitations, the gauge field becomes time dependent
and the synthetic vector potential is also associated with an electric field.
We show that... | 0904.4660v1 |
2010-08-12 | Dynamical damping terms for symmetry-seeking shift conditions | Suitable gauge conditions are fundamental for stable and accurate
numerical-relativity simulations of inspiralling compact binaries. A number of
well-studied conditions have been developed over the last decade for both the
lapse and the shift and these have been successfully used both in vacuum and
non-vacuum spacetime... | 1008.2212v2 |
2011-11-06 | The various manifestations of collisionless dissipation in wave propagation | The propagation of an electrostatic wave packet inside a collisionless and
initially Maxwellian plasma is always dissipative because of the irreversible
acceleration of the electrons by the wave. Then, in the linear regime, the wave
packet is Landau damped, so that in the reference frame moving at the group
velocity, t... | 1111.1391v2 |
2012-11-14 | New algorithm for footstep localization using seismic sensors in an indoor environment | In this study, we consider the use of seismic sensors for footstep
localization in indoor environments. A popular strategy of localization is to
use the measured differences in arrival times of source signals at multiple
pairs of receivers. In the literature, most algorithms that are based on time
differences of arriva... | 1211.3233v2 |
2014-05-19 | Comparison of micromagnetic parameters of ferromagnetic semiconductors (Ga,Mn)(As,P) and (Ga,Mn)As | We report on the determination of micromagnetic parameters of epilayers of
the ferromagnetic semiconductor (Ga,Mn)As, which has easy axis in the sample
plane, and (Ga,Mn)(As,P) which has easy axis perpendicular to the sample plane.
We use an optical analog of ferromagnetic resonance where the
laser-pulse-induced preces... | 1405.4677v1 |
2014-08-20 | Josephson junction ratchet: effects of finite capacitances | We study transport in an asymmetric SQUID which is composed of a loop with
three capacitively and resistively shunted Josephson junctions: two in series
in one arm and the remaining one in the other arm. The loop is threaded by an
external magnetic flux and the system is subjected to both a time-periodic and
a constant... | 1408.4607v1 |
2015-03-24 | Spin dynamics and frequency dependence of magnetic damping study in soft ferromagnetic FeTaC film with a stripe domain structure | Perpendicular magnetic anisotropy (PMA) and low magnetic damping are the key
factors for the free layer magnetization switching by spin transfer torque
technique in magnetic tunnel junction devices. The magnetization precessional
dynamics in soft ferromagnetic FeTaC thin film with a stripe domain structure
was explored... | 1503.07043v5 |
2015-09-07 | Spectral inequality and resolvent estimate for the bi-Laplace operator | On a compact Riemannian manifold with boundary, we prove a spectral
inequality for the bi-Laplace operator in the case of so-called "clamped"
boundary conditions , that is, homogeneous Dirichlet and Neumann conditions
simultaneously. We also prove a resolvent estimate for the generator of the
damped plate semigroup ass... | 1509.02098v5 |
2016-06-29 | On the global existence and blowup of smooth solutions to the multi-dimensional compressible Euler equations with time-depending damping | In this paper, we are concerned with the global existence and blowup of
smooth solutions to the multi-dimensional compressible Euler equations with
time-depending damping \begin{equation*}
\partial_t\rho+\operatorname{div}(\rho u)=0, \quad
\partial_t(\rho u)+\operatorname{div}\left(\rho u\otimes
u+p\,I_d\right)=-\a... | 1606.08935v1 |
2017-02-16 | Effects of Landau damping on ion-acoustic solitary waves in a semiclassical plasma | We study the nonlinear propagation of ion-acoustic waves (IAWs) in an
unmagnetized collisionless plasma with the effects of electron and ion Landau
damping in the weak quantum (semiclassical) regime, i.e., when the typical
ion-acoustic (IA) length scale is larger than the thermal de Broglie
wavelength. Starting from a ... | 1702.05035v2 |
2017-08-16 | Effects of group velocity and multi-plasmon resonances on the modulation of Langmuir waves in a degenerate plasma | We study the nonlinear wave modulation of Langmuir waves (LWs) in a fully
degenerate plasma. Using the Wigner-Moyal equation coupled to the Poisson
equation and the multiple scale expansion technique, a modified nonlocal
nonlinear Schr{\"{o}}dinger (NLS) equation is derived which governs the
evolution of LW envelopes i... | 1708.04965v3 |
2020-01-13 | Modelling Stochastic Signatures in Classical Pulsators | We consider the impact of stochastic perturbations on otherwise coherent
oscillations of classical pulsators. The resulting dynamics are modelled by a
driven damped harmonic oscillator subject to either an external or an internal
forcing and white noise velocity fluctuations. We characterize the phase and
relative ampl... | 2001.04558v1 |
2020-03-03 | Linear stability analysis for 2D shear flows near Couette in the isentropic Compressible Euler equations | In this paper, we investigate linear stability properties of the 2D
isentropic compressible Euler equations linearized around a shear flow given by
a monotone profile, close to the Couette flow, with constant density, in the
domain $\mathbb{T}\times \mathbb{R}$. We begin by directly investigating the
Couette shear flow... | 2003.01694v1 |
2020-05-27 | Role of diffusive surface scattering in nonlocal plasmonics | The recent generalised nonlocal optical response (GNOR) theory for plasmonics
is analysed, and its main input parameter, namely the complex hydrodynamic
convection-diffusion constant, is quantified in terms of enhanced Landau
damping due to diffusive surface scattering of electrons at the surface of the
metal. GNOR has... | 2005.13218v2 |
2021-01-28 | Vortex-induced Vibrations of a Confined Circular Cylinder for Efficient Flow Power Extraction | A simple method to increase the flow power extraction efficiency of a
circular cylinder, undergoing vortex-induced vibration (VIV), by confining it
between two parallel plates is proposed. A two-dimensional numerical study was
performed on VIV of a circular cylinder inside a parallel plate channel of
height H at Reynol... | 2101.11803v1 |
2021-03-26 | First-order strong-field QED processes including the damping of particles states | Volkov states are exact solutions of the Dirac equation in the presence of an
arbitrary plane wave. Volkov states, as well as free photon states, are not
stable in the presence of the background plane-wave field but "decay" as
electrons/positrons can emit photons and photons can transform into
electron-positron pairs. ... | 2103.14637v1 |
2021-08-11 | Numerical investigation of the formation and stability of homogeneous pairs of soft particles in inertial microfluidics | We investigate the formation and stability of a pair of identical soft
capsules in channel flow under mild inertia. We employ a combination of the
lattice Boltzmann, finite element and immersed boundary methods to simulate the
elastic particles in flow. Validation tests show excellent agreement with
numerical results o... | 2108.05277v1 |
2021-11-27 | Rate of Entropy Production in Stochastic Mechanical Systems | Entropy production in stochastic mechanical systems is examined here with
strict bounds on its rate. Stochastic mechanical systems include pure
diffusions in Euclidean space or on Lie groups, as well as systems evolving on
phase space for which the fluctuation-dissipation theorem applies, i.e.,
return-to-equilibrium pr... | 2111.13930v1 |
2022-04-20 | Ferrimagnet GdFeCo characterization for spin-orbitronics: large field-like and damping-like torques | Spintronics is showing promising results in the search for new materials and
effects to reduce energy consumption in information technology. Among these
materials, ferrimagnets are of special interest, since they can produce large
spin currents that trigger the magnetization dynamics of adjacent layers or
even their ow... | 2204.09776v1 |
2022-11-28 | Exciting the TTV Phases of Resonant Sub-Neptunes | There are excesses of sub-Neptunes just wide of period commensurabilities
like the 3:2 and 2:1, and corresponding deficits narrow of them. Any theory
that explains this period ratio structure must also explain the strong transit
timing variations (TTVs) observed near resonance. Besides an amplitude and a
period, a sinu... | 2211.15701v2 |
2023-01-23 | Estimation of turbulent proton and electron heating rates via Landau damping constrained by Parker Solar Probe observations | The heating of ions and electrons due to turbulent dissipation plays a
crucial role in the thermodynamics of the solar wind and other plasma
environments. Using magnetic field and thermal plasma observations from the
first two perihelia of the Parker Solar Probe (PSP), we model the relative
heating rates as a function ... | 2301.09713v1 |
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