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2021-08-21 | Heterogeneous multiscale methods for the Landau-Lifshitz equation | In this paper, we present a finite difference heterogeneous multiscale method
for the Landau-Lifshitz equation with a highly oscillatory diffusion
coefficient. The approach combines a higher order discretization and artificial
damping in the so-called micro problem to obtain an efficient implementation.
The influence o... | 2108.09463v1 |
2022-04-22 | Coefficient of restitution of a linear dashpot on a rigid surface | The linear dashpot model is applied to a single ball bouncing on a rigid
surface. It is shown that when gravity is included the coefficient of
restitution depends on impact velocity, in contrast to previous work that
ignored the effects of gravity. This velocity dependence is most pronounced at
low impact velocities an... | 2204.10917v1 |
2023-05-05 | When does an active bath behave as an equilibrium one? | Active baths are characterized by a non-Gaussian velocity distribution and a
quadratic dependence with active velocity $v_0$ of the kinetic temperature and
diffusion coefficient. While these results hold in over-damped active systems,
inertial effects lead to normal velocity distributions, with kinetic
temperature and ... | 2305.03830v1 |
2023-08-09 | Quantitative analysis of secondary Bjerkenes forces in various liquids | Numerically calculating the interaction forces between two free bubbles under
the action of a background of random acoustic radiation, we highlight the
contributions of radiative coefficient and absorption damping coefficient to
the size of these forces.It is quantitatively demonstrated, for different radii
of the osci... | 2308.13530v1 |
2010-11-29 | Long-time dynamics of Kirchhoff wave models with strong nonlinear damping | We study well-posedness and long-time dynamics of a class of quasilinear wave
equations with a strong damping. We accept the Kirchhoff hypotheses and assume
that the stiffness and damping coefficients are $C^1$ functions of the
$L_2$-norm of the gradient of the displacement. We first prove the existence
and uniqueness ... | 1011.6271v3 |
2013-09-13 | Analytical and experimental stability investigation of a hardware-in-the-loop satellite docking simulator | The European Proximity Operation Simulator (EPOS) of the DLR-German Aerospace
Center is a robotics-based simulator that aims at validating and verifying a
satellite docking phase. The generic concept features a robotics tracking
system working in closed loop with a force/torque feedback signal. Inherent
delays in the t... | 1309.3512v1 |
2014-06-13 | Magnetic-Field Amplification in the Thin X-ray Rims of SN1006 | Several young supernova remnants (SNRs), including SN1006, emit synchrotron
X-rays in narrow filaments, hereafter thin rims, along their periphery. The
widths of these rims imply 50 to 100 $\mu$G fields in the region immediately
behind the shock, far larger than expected for the interstellar medium
compressed by unmodi... | 1406.3630v2 |
2015-04-17 | Effective Action for Cosmological Scalar Fields at Finite Temperature | Scalar fields appear in many theories beyond the Standard Model of particle
physics. In the early universe, they are exposed to extreme conditions,
including high temperature and rapid cosmic expansion. Understanding their
behavior in this environment is crucial to understand the implications for
cosmology. We calculat... | 1504.04444v2 |
2017-05-19 | Analytical Prediction of Reflection Coefficients for Wave Absorbing Layers in Flow Simulations of Regular Free-Surface Waves | Undesired wave reflections, which occur at domain boundaries in flow
simulations with free-surface waves, can be minimized by applying source terms
in the vicinity of the boundary to damp the waves. Examples of such approaches
are absorbing layers, damping zones, forcing zones, relaxation zones and sponge
layers. A pro... | 1705.06940v2 |
2018-07-26 | Aspherical deformations of the Choptuik spacetime | We perform dynamical and nonlinear numerical simulations to study critical
phenomena in the gravitational collapse of massless scalar fields in the
absence of spherical symmetry. We evolve axisymmetric sets of initial data and
examine the effects of deviation from spherical symmetry. For small deviations
we find values... | 1807.10342v2 |
2019-03-07 | Non-linear diffusion of cosmic rays escaping from supernova remnants - II. Hot ionized media | We study the problem of the escape and transport of Cosmic-Rays (CR) from a
source embedded in a fully ionised, hot phase of the interstellar medium (HIM).
In particular, we model the CR escape and their propagation in the source
vicinity taking into account excitation of Alfv\'enic turbulence by CR
streaming and mecha... | 1903.03193v1 |
1997-09-04 | Cosmic-Ray Momentum Diffusion In Magnetosonic Versus Alfvenic Turbulent Field | Energetic particle transport in a finite amplitude magnetosonic and Alfvenic
turbulence is considered using Monte Carlo particle simulations, which involve
an integration of particle equation of motion. We show that in a low-Betha
plasma cosmic ray can be the most important damping process for magnetosonic
waves. Assum... | 9709039v2 |
2003-05-01 | Scalar perturbation spectra from warm inflation | We present a numerical integration of the cosmological scalar perturbation
equations in warm inflation. The initial conditions are provided by a
discussion of the thermal fluctuations of an inflaton field and thermal
radiation using a combination of thermal field theory and thermodynamics. The
perturbation equations in... | 0305015v3 |
2000-09-21 | Landau-Khalatnikov two-fluid hydrodynamics of a trapped Bose gas | Starting from the quantum kinetic equation for the non-condensate atoms and
the generalized Gross-Pitaevskii equation for the condensate, we derive the
two-fluid hydrodynamic equations of a trapped Bose gas at finite temperatures.
We follow the standard Chapman-Enskog procedure, starting from a solution of
the kinetic ... | 0009333v1 |
1999-05-28 | Existence threshold for the ac-driven damped nonlinear Schrödinger solitons | It has been known for some time that solitons of the externally driven,
damped nonlinear Schr\"odinger equation can only exist if the driver's
strength, $h$, exceeds approximately $(2/ \pi) \gamma$, where $\gamma$ is the
dissipation coefficient. Although this perturbative result was expected to be
correct only to the l... | 9906001v1 |
2009-11-11 | Ginzburg-Landau equation for dynamical four-wave mixing in gain nonlinear media with relaxation | We consider the dynamical degenerate four-wave mixing (FWM) model in a cubic
nonlinear medium including both the time relaxation of the induced nonlinearity
and the nonlocal coupling. The initial ten-dimensional FWM system can be
rewritten as a three-variable intrinsic system (namely the intensity pattern,
the amplitud... | 0911.2129v1 |
2010-02-05 | Damped-driven KdV and effective equation for long-time behaviour of its solutions | For the damped-driven KdV equation $$ \dot
u-\nu{u_{xx}}+u_{xxx}-6uu_x=\sqrt\nu \eta(t,x), x\in S^1, \int u dx\equiv
\int\eta dx\equiv0, $$ with $0<\nu\le1$ and smooth in $x$ white in $t$ random
force $\eta$, we study the limiting long-time behaviour of the KdV integrals of
motions $(I_1,I_2,...)$, evaluated along a so... | 1002.1294v1 |
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 |
2011-12-21 | A numerical method for computing radially symmetric solutions of a dissipative nonlinear modified Klein-Gordon equation | In this paper we develop a finite-difference scheme to approximate radially
symmetric solutions of the initial-value problem with smooth initial conditions
in an open sphere around the origin, where the internal and external damping
coefficients are constant, and the nonlinear term follows a power law. We prove
that ou... | 1112.4921v1 |
2013-08-20 | Group classification and exact solutions of variable-coefficient generalized Burgers equations with linear damping | Admissible point transformations between Burgers equations with linear
damping and time-dependent coefficients are described and used in order to
exhaustively classify Lie symmetries of these equations. Optimal systems of
one- and two-dimensional subalgebras of the Lie invariance algebras obtained
are constructed. The ... | 1308.4265v2 |
2015-05-21 | Control and stabilization of degenerate wave equations | We study a wave equation in one space dimension with a general diffusion
coefficient which degenerates on part of the boundary. Degeneracy is measured
by a real parameter $\mu_a>0$. We establish observability inequalities for
weakly (when $\mu_a \in [0,1[$) as well as strongly (when $\mu_a \in [1,2[$)
degenerate equati... | 1505.05720v1 |
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 |
2020-12-23 | 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 |
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 |
2021-03-06 | 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 |
2022-05-23 | Global existence, uniqueness and $L^{\infty}$-bound of weak solutions of fractional time-space Keller-Segel system | This paper studies the properties of weak solutions to a class of space-time
fractional parabolic-elliptic Keller-Segel equations with logistic source terms
in $\mathbb{R}^{n}$, $n\geq 2$. The global existence and $L^{\infty}$-bound of
weak solutions are established. We mainly divide the damping coefficient into
two ca... | 2205.11041v1 |
2023-03-30 | Superfluid $^3$He-B Surface States in a Confined Geometry Probed by a Microelectromechanical Oscillator | A microelectromechanical oscillator with a 0.73 $\mu$m gap structure is
employed to probe the surface Andreev bound states in superfluid $^3$He-B. The
surface specularity of the oscillator is increased by preplating it with 1.6
monolayers of $^4$He. In the linear regime, the temperature dependence of the
damping coeffi... | 2303.17073v1 |
2023-06-10 | Discrepant Approaches to Modeling Stellar Tides, and the Blurring of Pseudosynchronization | We examine the reasons for discrepancies between two alternative approaches
to modeling small-amplitude tides in binary systems. The 'direct solution' (DS)
approach solves the governing differential equations and boundary conditions
directly, while the 'modal decomposition' (MD) approach relies on a normal-mode
expansi... | 2306.06429v1 |
2023-08-25 | The time dimensional reduction method to determine the initial conditions without the knowledge of damping coefficients | This paper aims to reconstruct the initial condition of a hyperbolic equation
with an unknown damping coefficient. Our approach involves approximating the
hyperbolic equation's solution by its truncated Fourier expansion in the time
domain and using a polynomial-exponential basis. This truncation process
facilitates th... | 2308.13152v1 |
2024-02-05 | Symmetries and conservation laws of a fifth-order KdV equation with time-dependent coefficients and linear damping | A fifth-order KdV equation with time dependent coefficients and linear
damping has been studied. Symmetry groups have several different applications
in the context of nonlinear differential equations. For instance, they can be
used to determine conservation laws. We obtain the symmetries of the model
applying Lie's cla... | 2402.03265v1 |
2022-10-11 | Finite-time singularity formations for the Landau-Lifshitz-Gilbert equation in dimension two | We construct finite time blow-up solutions to the Landau-Lifshitz-Gilbert
equation (LLG) from ${\mathbb R}^2$ into $S^2$ \begin{equation*} \begin{cases}
u_t= a(\Delta u+|\nabla u|^2u) -b u\wedge \Delta u &\ \mbox{ in }\ {\mathbb
R}^2\times(0,T), u(\cdot,0) = u_0\in S^2 &\ \mbox{ in }\ {\mathbb R}^2,
\end{cases} \end{eq... | 2210.05800v1 |
2023-03-07 | Multilevel Monte Carlo methods for stochastic convection-diffusion eigenvalue problems | We develop new multilevel Monte Carlo (MLMC) methods to estimate the
expectation of the smallest eigenvalue of a stochastic convection-diffusion
operator with random coefficients. The MLMC method is based on a sequence of
finite element (FE) discretizations of the eigenvalue problem on a hierarchy of
increasingly finer... | 2303.03673v2 |
2008-12-31 | Weak Solutions of the Stochastic Landau-Lifshitz-Gilbert Equation | The Landau-Lifshitz-Gilbert equation perturbed by a multiplicative
space-dependent noise is considered for a ferromagnet filling a bounded
three-dimensional domain. We show the existence of weak martingale solutions
taking values in a sphere $\mathbb S^2$. The regularity of weak solutions is
also discussed. Some of the... | 0901.0039v1 |
2023-09-08 | Branching points in the planar Gilbert--Steiner problem have degree 3 | Gilbert--Steiner problem is a generalization of the Steiner tree problem on a
specific optimal mass transportation.
We show that every branching point in a solution of the planar
Gilbert--Steiner problem has degree 3. | 2309.04202v2 |
2000-03-27 | Electron-Ion Recombination Rate Coefficients and Photoionization Cross Sections for Astrophysically Abundant Elements IV. Relativistic calculations for C IV and C V for UV and X-ray modeling | The first complete set of unified cross sections and rate coefficients are
calculated for photoionization and recombination of He- and Li-like ions using
the relativistic Breit-Pauli R-matrix method. We present total, unified (e +
ion) recombination rate coefficients for (e + C VI ---> C V) and (e + C V
\longrightarrow... | 0003411v2 |
2018-07-19 | Magnetization nutation induced by surface effects in nanomagnets | We investigate the magnetization dynamics of ferromagnetic nanoparticles in
the atomistic approach taking account of surface anisotropy and the spin
misalignment it causes. We demonstrate that such inhomogeneous spin
configurations induce nutation in the dynamics of the particle's magnetization.
More precisely, in addi... | 1807.07392v1 |
2021-07-02 | Scaling of Turbulent Viscosity and Resistivity: Extracting a Scale-dependent Turbulent Magnetic Prandtl Number | Turbulent viscosity $\nu_t$ and resistivity $\eta_t$ are perhaps the simplest
models for turbulent transport of angular momentum and magnetic fields,
respectively. The associated turbulent magnetic Prandtl number $Pr_t\equiv
\nu_t/\eta_t$ has been well recognized to determine the final magnetic
configuration of accreti... | 2107.00861v1 |
2023-01-23 | Correction of high-order phase variation effects in dynamic field monitoring | Purpose: Field monitoring measures field perturbations, which can be
accounted for during image reconstructions. In certain field monitoring
environments, significant phase deviations can arise far from isocenter due to
the finite extent of the gradient and/or main magnet. This can degrade the
accuracy of field dynamic... | 2301.09726v1 |
2003-03-17 | Quantum phase space function formulation of reactive flux theory | On the basis of a coherent state representation of quantum noise operator and
an ensemble averaging procedure a scheme for quantum Brownian motion has been
proposed recently [Banerjee {\it et al}, Phys. Rev. E {\bf65}, 021109 (2002);
{\bf66}, 051105 (2002)]. We extend this approach to formulate reactive flux
theory in ... | 0303319v1 |
2017-01-30 | Regularized solutions for some backward nonlinear parabolic equations with statistical data | In this paper, we study the backward problem of determining initial condition
for some class of nonlinear parabolic equations in multidimensional domain
where data are given under random noise. This problem is ill-posed, i.e., the
solution does not depend continuously on the data. To regularize the instable
solution, w... | 1701.08459v2 |
2019-04-18 | Random coefficient autoregressive processes describe Brownian yet non-Gaussian diffusion in heterogeneous systems | Many studies on biological and soft matter systems report the joint presence
of a linear mean-squared displacement and a non-Gaussian probability density
exhibiting, for instance, exponential or stretched-Gaussian tails. This
phenomenon is ascribed to the heterogeneity of the medium and is captured by
random parameter ... | 1904.08737v2 |
2023-05-10 | Poles of hydrodynamic spectral functions and Einstein-Helfand formulas for transport coefficients | The local-equilibrium approach to transport processes is related to the
approach based on time-dependent correlation functions and their associated
spectral functions characterizing the equilibrium fluctuations of particle,
momentum and other densities. On the one hand, the transport coefficients are
calculated with th... | 2305.06287v1 |
2023-06-08 | Temperature anomalies of oscillating diffusion in ac-driven periodic systems | We analyse the impact of temperature on the diffusion coefficient of an
inertial Brownian particle moving in a symmetric periodic potential and driven
by a symmetric time-periodic force. Recent studies have revealed the low
friction regime in which the diffusion coefficient shows giant damped
quasi-periodic oscillation... | 2306.04977v1 |
2024-03-22 | Investigating the Relationship between Simulation Parameters and Flow Variables in Simulating Atmospheric Gravity Waves in Wind Energy Applications | Wind farms, particularly offshore clusters, are becoming larger than ever
before. Besides influencing wind farms and local meteorology downstream, large
wind farms can trigger atmospheric gravity waves in the inversion layer and the
free atmosphere aloft. Wind farm-induced gravity waves can cause adverse
pressure gradi... | 2403.18863v1 |
2000-02-23 | Two-frequency forced Faraday waves: Weakly damped modes and pattern selection | Recent experiments (Kudrolli, Pier and Gollub, 1998) on two-frequency
parametrically excited surface waves exhibit an intriguing "superlattice" wave
pattern near a codimension-two bifurcation point where both subharmonic and
harmonic waves onset simultaneously, but with different spatial wavenumbers.
The superlattice p... | 0002041v2 |
2007-12-28 | Role of antikaon condensation in r-mode instability | We investigate the effect of antikaon condensed matter on bulk viscosity in
rotating neutron stars. We use relativistic field theoretical models to
construct the equation of state of neutron stars with the condensate, where the
phase transition from nucleonic to $K^-$ condensed phase is assumed to be of
first order. We... | 0712.4347v1 |
2020-03-30 | DAMPE proton spectrum indicates a slow-diffusion zone in the nearby ISM | The hardening and softening features in the DAMPE proton spectrum are very
likely to be originated from a nearby supernova remnant (SNR). The proton
spectrum from the nearby SNR is required to be very hard below $\approx10$ TeV.
To reproduce this feature, we illustrate that anomalously slow-diffusion zone
for cosmic ra... | 2003.13635v1 |
2021-08-20 | Cosmic-Ray Transport in Simulations of Star-forming Galactic Disks | Cosmic ray transport on galactic scales depends on the detailed properties of
the magnetized, multiphase interstellar medium (ISM). In this work, we
post-process a high-resolution TIGRESS magnetohydrodynamic simulation modeling
a local galactic disk patch with a two-moment fluid algorithm for cosmic ray
transport. We c... | 2108.09356v1 |
2021-08-29 | Sound induced by a simple impact oscillator | Acoustic radiation due to vibration and impact of a spring-mass-damper
oscillator whose motion is constrained by a barrier is analyzed at a field
point in a free field. Impact between the mass and the barrier is modeled using
a coefficient of restitution model. Non-linear behavior of the oscillator is
observed due to m... | 2108.12804v1 |
2022-04-30 | A spectral element solution of the 2D linearized potential flow radiation problem | We present a scalable 2D Galerkin spectral element method solution to the
linearized potential flow radiation problem for wave induced forcing of a
floating offshore structure. The pseudo-impulsive formulation of the problem is
solved in the time-domain using a Gaussian displacement signal tailored to the
discrete reso... | 2205.00184v1 |
2007-02-23 | Organization of the Modulopt collection of optimization problems in the Libopt environment -- Version 1.0 | This note describes how the optimization problems of the Modulopt collection
are organized within the Libopt environment. It is aimed at being a guide for
using and enriching this collection in this environment. | 0702695v1 |
2005-10-17 | Comment on "Operator Quantum Error Correction" | The attempt to equate operator quantum error correction (quant-ph/0504189v1)
with the quantum computer condition (quant-ph/0507141) in version two of
quant-ph/0504189 is shown to be invalid. | 0510116v1 |
2007-09-17 | H-Decompositions | We show that for all graphs H of size n, the complete graph $K_{2n+1}$ has an
$H$-decomposition. | 0709.2525v5 |
2008-10-06 | Unsolvability of the isomorphism problem for [free abelian]-by-free groups | The isomorphism problem for [free abelian]-by-free groups is unsolvable. | 0810.0935v2 |
2011-11-27 | Comment on "Capturing correlations in chaotic diffusion by approximation methods" | This is a comment on [G. Knight and R. Klages, Phys. Rev. E 84, 041135
(2011); also available at arXiv:1107.5293v2 [math-ph]]. | 1111.6271v1 |
2014-01-11 | Hashimoto transform for stochastic Landau-Lifshitz-Gilbert equation | We show that Hashimoto transformation is applicable to the one dimensional
stochastic Landau-Lifshitz-Gilbert (LLG) equation and transforms it to the
stochastic generalized heat equation with nonlocal (in space) interaction. | 1401.2520v1 |
2017-01-04 | Non-linear Cyclic Codes that Attain the Gilbert-Varshamov Bound | We prove that there exist non-linear binary cyclic codes that attain the
Gilbert-Varshamov bound. | 1701.01043v1 |
2019-01-28 | Conformal deformations preserving the Finslerian $R$-Einstein criterion | Given a Finslerian metric $F$ on a $C^4$-manifold, conformal deformations of
$F$ preserving the $R$-Einstein criterion are presented. In particular, locally
conformal invariance between two Finslerian $R$-Einstein metrics is
characterized. | 1902.00069v1 |
2022-04-07 | How to design a network architecture using availability | The best way to design a network is to take into account Availability values
and Capacity Planning. You already saw Availability expressed with numbers such
as 99.99%. The purpose of this document is to introduce the way to compute
Availability values using Reliability Block Diagrams. | 2204.03311v1 |
2022-01-06 | Parameter-free quantum hydrodynamic theory for plasmonics: Electron density-dependent damping rate and diffusion coefficient | Plasmonics is a rapid growing field, which has enabled both fundamental
science and inventions of various quantum optoelectronic devices. An accurate
and efficient method to calculate the optical response of metallic structures
with feature size in the nanoscale plays an important role. Quantum
hydrodynamic theory (QHT... | 2201.03426v3 |
2010-02-22 | Transport and magnetization dynamics in a superconductor/single-molecule magnet/superconductor junction | We study dc-transport and magnetization dynamics in a junction of arbitrary
transparency consisting of two spin-singlet superconducting leads connected via
a single classical spin precessing at the frequency $\Omega$. The presence of
the spin in the junction provides different transmission amplitudes for spin-up
and sp... | 1002.3929v4 |
2013-06-18 | Baryons do trace dark matter 380,000 years after the big bang: Search for compensated isocurvature perturbations with WMAP 9-year data | Primordial isocurvature fluctuations between photons and either neutrinos or
non-relativistic species such as baryons or dark matter are known to be
sub-dominant to adiabatic fluctuations. Perturbations in the relative densities
of baryons and dark matter (known as compensated isocurvature perturbations, or
CIPs), howe... | 1306.4319v1 |
2015-05-29 | Microscopic Theory for Coupled Atomistic Magnetization and Lattice Dynamics | A coupled atomistic spin and lattice dynamics approach is developed which
merges the dynamics of these two degrees of freedom into a single set of
coupled equations of motion. The underlying microscopic model comprises local
exchange interactions between the electron spin and magnetic moment and the
local couplings bet... | 1505.08005v3 |
2016-04-28 | Dynamics of skyrmionic states in confined helimagnetic nanostructures | In confined helimagnetic nanostructures, skyrmionic states in the form of
incomplete and isolated skyrmion states can emerge as the ground state in
absence of both external magnetic field and magnetocrystalline anisotropy. In
this work, we study the dynamic properties (resonance frequencies and
corresponding eigenmodes... | 1604.08347v2 |
2017-04-13 | Low energy magnon dynamics and magneto-optics of the skyrmionic Mott insulator Cu$_2$OSeO$_3$ | In this work, we present a comprehensive study of the low energy optical
magnetic response of the skyrmionic Mott insulator Cu$_2$OSeO$_3$ via high
resolution time-domain THz spectroscopy. In zero field, a new magnetic
excitation not predicted by spin-wave theory with frequency $f$ = 2.03 THz is
observed and shown, wit... | 1704.04228v1 |
2017-08-25 | Role of dimensional crossover on spin-orbit torque efficiency in magnetic insulator thin films | Magnetic insulators (MIs) attract tremendous interest for spintronic
applications due to low Gilbert damping and absence of Ohmic loss. Magnetic
order of MIs can be manipulated and even switched by spin-orbit torques (SOTs)
generated through spin Hall effect and Rashba-Edelstein effect in heavy
metal/MI bilayers. SOTs ... | 1708.07584v2 |
2018-07-04 | Phase Boundary Exchange Coupling in the Mixed Magnetic Phase Regime of a Pd-doped FeRh Epilayer | Spin-wave resonance measurements were performed in the mixed magnetic phase
regime of a Pd-doped FeRh epilayer that appears as the first-order
ferromagnetic-antiferromagnetic phase transition takes place. It is seen that
the measured value of the exchange stiffness is suppressed throughout the
measurement range when co... | 1807.01615v6 |
2018-07-26 | EPIC 246851721 b: A Tropical Jupiter Transiting a Rapidly Rotating Star in a Well-Aligned Orbit | We report the discovery of EPIC 246851721 b, a "tropical" Jupiter in a
6.18-day orbit around the bright ($V=11.439$) star EPIC 246851721 (TYC
1283-739-1). We present a detailed analysis of the system using $K2$ and
ground-based photometry, radial velocities, Doppler tomography and adaptive
optics imaging. From our glob... | 1807.10298v2 |
2018-09-10 | Magnetic properties and field-driven dynamics of chiral domain walls in epitaxial Pt/Co/Au$_x$Pt$_{1-x}$ trilayers | Chiral domain walls in ultrathin perpendicularly magnetised layers have a
N\'{e}el structure stabilised by a Dzyaloshinskii-Moriya interaction (DMI) that
is generated at the interface between the ferromagnet and a heavy metal.
Different heavy metals are required above and below a ferromagnetic film in
order to generate... | 1809.03217v2 |
2019-09-06 | Macrospin analysis of RF excitations within fully perpendicular magnetic tunnel junctions with second order easy-axis magnetic anisotropy contribution | The conditions of field and voltage for inducing steady state excitations in
fully perpendicular magnetic tunnel junctions (pMTJs), adapted for memory
applications, were numerically investigated by the resolution of the
Landau-Lifshitz-Gilbert equation in the macrospin approach. Both damping-like
and the field-like spi... | 1909.02926v1 |
2021-04-21 | Atomic Layer Deposition of Yttrium Iron Garnet Thin Films for 3D Magnetic Structures | A wide variety of new phenomena such as novel magnetization configurations
have been predicted to occur in three dimensional magnetic nanostructures.
However, the fabrication of such structures is often challenging due to the
specific shapes required, such as magnetic tubes and spirals. Furthermore, the
materials curre... | 2104.10293v2 |
2022-11-03 | Skyrmion Jellyfish in Driven Chiral Magnets | Chiral magnets can host topological particles known as skyrmions, which carry
an exactly quantised topological charge $Q=-1$. In the presence of an
oscillating magnetic field ${\bf B}_1(t)$, a single skyrmion embedded in a
ferromagnetic background will start to move with constant velocity ${\bf
v}_{\text{trans}}$. The ... | 2211.01714v5 |
2023-04-05 | Threshold current of field-free perpendicular magnetization switching using anomalous spin-orbit torque | Spin-orbit torque (SOT) is a candidate technique in next generation magnetic
random-access memory (MRAM). Recently, experiments show that some material with
low-symmetric crystalline or magnetic structures can generate anomalous SOT
that has an out-of-plane component, which is crucial in switching perpendicular
magneti... | 2304.02248v2 |
1997-07-15 | Linear Response, Dynamical Friction and the Fluctuation-Dissipation Theorem in Stellar Dynamics | We apply linear response theory to a general, inhomogeneous, stationary
stellar system, with particular emphasis on dissipative processes analogous to
Landau damping. Assuming only that the response is causal, we show that the
irreversible work done by an external perturber is described by the
anti-Hermitian part of a ... | 9707161v1 |
2003-06-10 | Oscillations of Bose-Einstein condensates with vortex lattices. II. Finite temperatures | We derive the finite temperature oscillation modes of a harmonically confined
Bose-Einstein condensed gas undergoing rigid body rotation supported by a
vortex lattice in the condensate. The hydrodynamic modes separate into two
classes corresponding to in-phase (center-of-mass) and counter-phase (relative)
oscillations ... | 0306245v2 |
2005-01-28 | Summation of divergent series and Borel summability for strongly dissipative equations with periodic or quasi-periodic forcing terms | We consider a class of second order ordinary differential equations
describing one-dimensional systems with a quasi-periodic analytic forcing term
and in the presence of damping. As a physical application one can think of a
resistor-inductor-varactor circuit with a periodic (or quasi-periodic) forcing
function, even if... | 0501500v1 |
2009-09-30 | Dynamic polarization of graphene by moving external charges: random phase approximation | We evaluate the stopping and image forces on a charged particle moving
parallel to a doped sheet of graphene by using the dielectric response
formalism for graphene's $\pi$-electron bands in the random phase approximation
(RPA). The forces are presented as functions of the particle speed and the
particle distance for a... | 0909.5598v3 |
2010-03-12 | Improving the model of emission from spinning dust: effects of grain wobbling and transient spin-up | Observations continue to support the interpretation of the anomalous
microwave foreground as electric dipole radiation from spinning dust grains as
proposed by Draine and Lazarian (1998ab). In this paper we present a refinement
of the original model by improving the treatment of a number of physical
effects. First, we ... | 1003.2638v2 |
2013-05-15 | Beam energy dependence of the viscous damping of anisotropic flow | The flow harmonics $v_{2,3}$ for charged hadrons, are studied for a broad
range of centrality selections and beam collision energies in Au+Au
($\sqrt{s_{NN}}= 7.7 - 200$ GeV) and Pb+Pb ($\sqrt{s_{NN}}= 2.76$ TeV)
collisions. They validate the characteristic signature expected for the system
size dependence of viscous d... | 1305.3341v3 |
2014-07-15 | C$ν$B damping of primordial gravitational waves and the fine-tuning of the C$γ$B temperature anisotropy | Damping of primordial gravitational waves due to the anisotropic stress
contribution owing to the cosmological neutrino background (C$\nu$B) is
investigated in the context of a radiation-to-matter dominated Universe.
Besides its inherent effects on the gravitational wave propagation, the
inclusion of the C$\nu$B anisot... | 1407.4058v1 |
2014-12-08 | Variable frequency characterization of interaction at nanoscale in linear dynamic AFM: an FFM primer | Using electrostatic coupling between an AFM tip and a metallic surface as a
test interaction, we here present the measurement of the force between the tip
and the surface, together with the measurement of the interaction stiffness and
the associated dissipation. These three quantities constitute a full
characterization... | 1412.2640v1 |
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 |
2017-12-22 | Low-momentum dynamic structure factor of a strongly interacting Fermi gas at finite temperature: A two-fluid hydrodynamic description | We provide a description of the dynamic structure factor of a homogeneous
unitary Fermi gas at low momentum and low frequency, based on the dissipative
two-fluid hydrodynamic theory. The viscous relaxation time is estimated and is
used to determine the regime where the hydrodynamic theory is applicable and to
understan... | 1712.08320v1 |
2018-10-17 | Resonance-broadened transit time damping of particles in MHD turbulence | As a fundamental astrophysical process, the scattering of particles by
turbulent magnetic fields has its physical foundation laid by the
magnetohydrodynamic (MHD) turbulence theory. In the framework of the modern
theory of MHD turbulence, we derive a generalized broadened resonance function
by taking into account both ... | 1810.07726v1 |
2019-05-17 | Statics and Dynamics of Polymeric Droplets on Chemically Homogeneous and Heterogeneous Substrates | We present a molecular dynamics study of the motion of cylindrical polymer
droplets on striped surfaces. We first consider the equilibrium properties of
droplets on different surfaces, we show that for small stripes the
Cassie-Baxter equation gives a good approximation of the equilibrium contact
angle. As the stripe wi... | 1905.07214v1 |
2020-05-22 | Quasinormal modes, shadow and greybody factors of 5D electrically charged Bardeen black holes | We study quasinormal modes (QNMs) in 5D electrically charged Bardeen black
holes spacetime by considering the scalar and electromagnetic field
perturbations. The black holes spacetime is an exact solution of Einstein
gravity coupled to nonlinear electrodynamics in five dimensions, which has
nonsingular behavior. To cal... | 2005.11080v2 |
2020-09-25 | Direct computation of nonlinear mapping via normal form for reduced-order models of finite element nonlinear structures | The direct computation of the third-order normal form for a geometrically
nonlinear structure discretised with the finite element (FE) method, is
detailed. The procedure allows to define a nonlinear mapping in order to derive
accurate reduced-order models (ROM) relying on invariant manifold theory. The
proposed reducti... | 2009.12145v1 |
2020-10-08 | A blow-up result for the wave equation with localized initial data: the scale-invariant damping and mass term with combined nonlinearities | We are interested in this article in studying the damped wave equation with
localized initial data, in the \textit{scale-invariant case} with mass term and
two combined nonlinearities. More precisely, we consider the following
equation: $$ (E) {1cm} u_{tt}-\Delta
u+\frac{\mu}{1+t}u_t+\frac{\nu^2}{(1+t)^2}u=|u_t|^p+|u|^... | 2010.05455v1 |
2021-07-31 | Damped inertial dynamics with vanishing Tikhonov regularization: strong asymptotic convergence towards the minimum norm solution | In a Hilbert space, we provide a fast dynamic approach to the hierarchical
minimization problem which consists in finding the minimum norm solution of a
convex minimization problem. For this, we study the convergence properties of
the trajectories generated by a damped inertial dynamic with Tikhonov
regularization. Whe... | 2108.00203v1 |
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 |
2021-11-13 | Attenuation of surface modes in granular media | In this work, an unconsolidated granular medium, made of silica microbeads,
is experimentally tested in a laboratory setting. The objective is to
investigate the attenuation mechanisms of vertically polarized seismic waves
traveling at the surface of unconsolidated substrates that are characterized by
power-law rigidit... | 2111.07199v1 |
2021-11-15 | The Interplay of Regularizing Factors in the Model of Upper Hybrid Oscillations of Cold Plasma | A one-dimensional nonlinear model of the so-called upper hybrid oscillations
in a magnetoactive plasma is investigated taking into account electron-ion
collisions. It is known that both the presence of an external magnetic field of
strength $ B_0 $ and a sufficiently large collisional factor $ \nu $ help
suppress the f... | 2111.07826v3 |
2021-11-20 | Excitation and Damping of Slow Magnetosonic Waves in Flaring Hot Coronal Loops: Effects of Compressive Viscosity | Slow magnetosonic waves associated with flares were observed in coronal loops
by SOHO/SUMER, SDO/AIA in various EUV bandpasses, and other instruments. The
excitation and damping of slow magnetosonic waves provides information on the
magnetic, temperature, and density structure of the loops. Recently, it was
found using... | 2111.10696v1 |
2022-10-17 | Interpretations of the cosmic ray secondary-to-primary ratios measured by DAMPE | Precise measurements of the boron-to-carbon and boron-to-oxygen ratios by
DAMPE show clear hardenings around $100$ GeV/n, which provide important
implications on the production, propagation, and interaction of Galactic cosmic
rays. In this work we investigate a number of models proposed in literature in
light of the DA... | 2210.09205v3 |
2022-12-28 | Scattering of the UHECR at small pitch angle by damped plasma waves | In spite a lot of theoretical and experimental effort that has been achieved
in ultra-high energy cosmic ray (UHECR) scattering research in last few
decades, some questions remain unanswered, or partially answered. Two of them,
that will be in the focus of this paper are: possible source of UHECRs and the
acceleration ... | 2212.13755v1 |
2001-03-19 | Fluctuations in the Cosmic Microwave Background I: Form Factors and their Calculation in Synchronous Gauge | It is shown that the fluctuation in the temperature of the cosmic microwave
background in any direction may be evaluated as an integral involving scalar
and dipole form factors, which incorporate all relevant information about
acoustic oscillations before the time of last scattering. A companion paper
gives asymptotic ... | 0103279v2 |
2005-08-05 | Damping of vortex waves in a superfluid | The damping of vortex cyclotron modes is investigated within a generalized
quantum theory of vortex waves. Similarly to the case of Kelvin modes, the
friction coefficient turns out to be essentially unchanged under such
oscillations, but it is shown to be affected by appreciable memory corrections.
On the other hand, t... | 0508167v1 |
2005-09-02 | Inhomogeneous soliton ratchets under two ac forces | We extend our previous work on soliton ratchet devices [L. Morales-Molina et
al., Eur. Phys. J. B 37, 79 (2004)] to consider the joint effect of two ac
forces including non-harmonic drivings, as proposed for particle ratchets by
Savele'v et al. [Europhys. Lett. 67}, 179 (2004); Phys. Rev. E {\bf 70} 066109
(2004)]. Cur... | 0509051v1 |
2007-01-16 | Influence of Lorentz violation on Dirac quasinormal modes in the Schwarzschild black hole spacetime | Using the third-order WKB approximation and monodromy methods, we investigate
the influence of Lorentz violating coefficient $b$ (associated with a special
axial-vector $b_{\mu}$ field) on Dirac quasinormal modes in the Schwarzschild
black hole spacetime. At fundamental overtone, the real part decreases linearly
as the... | 0701089v1 |
1994-01-21 | Transport Properties of Quark and Gluon Plasmas | The kinetic properties of relativistic quark-gluon and electron-photon
plasmas are described in the weak coupling limit. The troublesome Rutherford
divergence at small scattering angles is screened by Debye screening for the
longitudinal or electric part of the interactions. The transverse or magnetic
part of the inter... | 9401300v1 |
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