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2023-05-26 | Sphaleron rate from a modified Backus-Gilbert inversion method | We compute the sphaleron rate in quenched QCD for a temperature $T \simeq
1.24~T_c$ from the inversion of the Euclidean lattice time correlator of the
topological charge density. We explore and compare two different strategies:
one follows a new approach proposed in this study and consists in extracting
the rate from f... | 2305.17120v2 |
2023-07-21 | Visibility graph-based covariance functions for scalable spatial analysis in nonconvex domains | We present a new method for constructing valid covariance functions of
Gaussian processes over irregular nonconvex spatial domains such as water
bodies, where the geodesic distance agrees with the Euclidean distance only for
some pairs of points. Standard covariance functions based on geodesic distances
are not positiv... | 2307.11941v2 |
2023-08-23 | Consistency of common spatial estimators under spatial confounding | This paper addresses the asymptotic performance of popular spatial regression
estimators on the task of estimating the effect of an exposure on an outcome in
the presence of an unmeasured spatially-structured confounder. This setting is
often referred to as "spatial confounding." We consider spline models, Gaussian
pro... | 2308.12181v1 |
2023-09-19 | Stochastic control of the Landau-Lifshitz-Gilbert equation | We consider the stochastic Landau-Lifshitz-Gilbert equation in dimension 1. A
control process is added to the effective field. We show the existence of a
weak martingale solution for the resulting controlled equation. The proof uses
the classical Faedo-Galerkin approximation, along with the Jakubowski version
of the Sk... | 2309.10260v1 |
2023-10-18 | Parallel-in-Time Integration of the Landau-Lifshitz-Gilbert Equation with the Parallel Full Approximation Scheme in Space and Time | Speeding up computationally expensive problems, such as numerical simulations
of large micromagnetic systems, requires efficient use of parallel computing
infrastructures. While parallelism across space is commonly exploited in
micromagnetics, this strategy performs poorly once a minimum number of degrees
of freedom pe... | 2310.11819v1 |
2023-12-29 | Chebyshev and Backus-Gilbert reconstruction for inclusive semileptonic $B_{(s)}$-meson decays from Lattice QCD | We present a study on the nonperturbative calculation of observables for
inclusive semileptonic decays of $B_{(s)}$ mesons using lattice QCD. We focus
on the comparison of two different methods to analyse the lattice data of
Euclidean correlation functions, specifically Chebyshev and Backus-Gilbert
approaches. This typ... | 2312.17401v1 |
2024-02-22 | Gilbert-Varshamov Bound for Codes in $L_1$ Metric using Multivariate Analytic Combinatorics | Analytic combinatorics in several variables refers to a suite of tools that
provide sharp asymptotic estimates for certain combinatorial quantities. In
this paper, we apply these tools to determine the Gilbert--Varshamov lower
bound on the rate of optimal codes in $L_1$ metric. Several different code
spaces are analyze... | 2402.14712v1 |
2024-02-28 | Embodied Supervision: Haptic Display of Automation Command to Improve Supervisory Performance | A human operator using a manual control interface has ready access to their
own command signal, both by efference copy and proprioception. In contrast, a
human supervisor typically relies on visual information alone. We propose
supplying a supervisor with a copy of the operators command signal,
hypothesizing improved p... | 2402.18707v1 |
2024-03-14 | Quantum analog of Landau-Lifshitz-Gilbert dynamics | The Landau-Lifshitz-Gilbert (LLG) and Landau-Lifshitz (LL) equations play an
essential role for describing the dynamics of magnetization in solids. While a
quantum analog of the LL dynamics has been proposed in [Phys. Rev. Lett. 110,
147201 (2013)], the corresponding quantum version of LLG remains unknown. Here,
we pro... | 2403.09255v1 |
2024-03-15 | Identification and estimation of mediational effects of longitudinal modified treatment policies | We demonstrate a comprehensive semiparametric approach to causal mediation
analysis, addressing the complexities inherent in settings with longitudinal
and continuous treatments, confounders, and mediators. Our methodology utilizes
a nonparametric structural equation model and a cross-fitted sequential
regression techn... | 2403.09928v1 |
2024-03-22 | Two-scale Analysis for Multiscale Landau-Lifshitz-Gilbert Equation: Theory and Numerical Methods | This paper discusses the theory and numerical method of two-scale analysis
for the multiscale Landau-Lifshitz-Gilbert equation in composite ferromagnetic
materials. The novelty of this work can be summarized in three aspects:
Firstly, the more realistic and complex model is considered, including the
effects of the exch... | 2403.14957v1 |
2020-11-30 | Role of Compressive Viscosity and Thermal Conductivity on the Damping of Slow Waves in the Coronal Loops With and Without Heating-Cooling Imbalance | In the present paper, we derive a new dispersion relation for slow
magnetoacoustic waves invoking the effect of thermal conductivity, compressive
viscosity, radiation and unknown heating term along with the consideration of
heating cooling imbalance from linearized MHD equations. We solve the general
dispersion relatio... | 2011.14519v2 |
1999-08-20 | The ac-Driven Motion of Dislocations in a Weakly Damped Frenkel-Kontorova Lattice | By means of numerical simulations, we demonstrate that ac field can support
stably moving collective nonlinear excitations in the form of dislocations
(topological solitons, or kinks) in the Frenkel-Kontorova (FK) lattice with
weak friction, which was qualitatively predicted by Bonilla and Malomed [Phys.
Rev. B{\bf 43}... | 9908292v1 |
2003-06-19 | Quantum model of phonon transport and heat conductivity in carbon nanoclusters and nanotubes | A complex approach phonon quantum discrete model (PQDM) was developed to
describe dynamics, kinetics and statistics of phonons in carbon nanostructures
with zero-chirality of both zig-zag and armchair geometry. The model allows
include into the pure phonon problem existing interaction with others
subsystems: electrons,... | 0306503v1 |
2005-02-11 | A Weakly Nonlinear Analysis of Impulsively-Forced Faraday Waves | Parametrically-excited surface waves, forced by a periodic sequence of
delta-function impulses, are considered within the framework of the
Zhang-Vi\~nals model (J. Fluid Mech. 1997). The exact impulsive-forcing
results, in the linear and weakly nonlinear regimes, are compared with
numerical results for sinusoidal and m... | 0502025v1 |
2007-06-25 | Toward faithful templates for non-spinning binary black holes using the effective-one-body approach | We present an accurate approximation of the full gravitational radiation
waveforms generated in the merger of non-eccentric systems of two non-spinning
black holes. Utilizing information from recent numerical relativity simulations
and the natural flexibility of the effective-one-body (EOB) model, we extend
the latter ... | 0706.3732v3 |
2011-08-21 | Time-Dependent Behavior of Lyman$α$ Photon Transfer in High Redshift Optically Thick Medium | With Monte Carlo simulation method, we investigate the time dependent
behavior of Ly$\alpha$ photon transfer in optically thick medium of the
concordance $\Lambda$CDM universe. At high redshift, the Ly$\alpha$ photon
escaping from optically thick medium has a time scale as long as the age of the
luminous object, or eve... | 1108.4162v1 |
2011-09-03 | Magnetic Fields Effects on the Electronic Conduction Properties of Molecular Ring Structures | While mesoscopic conducting loops are sensitive to external magnetic fields,
as seen by observations of the Aharonov-Bohm (AB) effect in such structures,
the field needed to observe the AB periodicity in small molecular rings is
unrealistically large. The present study aims to identify conditions under
which magnetic f... | 1109.0619v1 |
2012-04-01 | Resonance Broadening and Heating of Charged Particles in Magnetohydrodynamic Turbulence | The heating, acceleration, and pitch-angle scattering of charged particles by
MHD turbulence are important in a wide range of astrophysical environments,
including the solar wind, accreting black holes, and galaxy clusters. We
simulate the interaction of high-gyrofrequency test particles with fully
dynamical simulation... | 1204.0155v2 |
2012-07-18 | Quasinormal-mode spectrum of Kerr black holes and its geometric interpretation | There is a well-known, intuitive geometric correspondence between
high-frequency QNMs of Schwarzschild black holes and null geodesics that reside
on the light-ring : the real part of the mode's frequency relates to the
geodesic's orbital frequency, and the imaginary part of the frequency
corresponds to the Lyapunov exp... | 1207.4253v1 |
2013-03-18 | Sensitivity analysis of a time-delayed thermo-acoustic system via an adjoint-based approach | We apply adjoint-based sensitivity analysis to a time-delayed thermo-acoustic
system: a Rijke tube containing a hot wire. We calculate how the growth rate
and frequency of small oscillations about a base state are affected either by a
generic passive control element in the system (the structural sensitivity
analysis) o... | 1303.4267v2 |
2013-07-12 | Detection of Lyβauto-correlations and Lyα-Lyβ cross-correlations in BOSS Data Release 9 | The Lyman-$\beta$ forest refers to a region in the spectra of distant quasars
that lies between the rest-frame Lyman-$\beta$ and Lyman-$\gamma$ emissions.
The forest in this region is dominated by a combination of absorption due to
resonant Ly$\alpha$ and Ly$\beta$ scattering. When considering the 1D Ly$\beta$
forest i... | 1307.3403v4 |
2013-12-20 | Stability Boundaries for Resonant Migrating Planet Pairs | Convergent migration allows pairs of planet to become trapped into mean
motion resonances. Once in resonance, the planets' eccentricities grow to an
equilibrium value that depends on the ratio of migration time scale to the
eccentricity damping timescale, $K=\tau_a/\tau_e$, with higher values of
equilibrium eccentricit... | 1312.6099v1 |
2014-04-10 | Electromagnetic effects in the pion dispersion relation at finite temperature | We investigate the charged-neutral pion self-energy difference at finite
temperature. Within Chiral Perturbation Theory we extend previous analysis in
the chiral and soft pion limits. Our analysis with physical masses leads to
additional contributions for temperatures typical of a meson gas, including a
momentum-depend... | 1404.2746v3 |
2014-11-10 | Nonlinear Dynamics of Particles Excited by an Electric Curtain | The use of the electric curtain (EC) has been proposed for manipulation and
control of particles in various applications. The EC studied in this paper is
called the 2-phase EC, which consists of a series of long parallel electrodes
embedded in a thin dielectric surface. The EC is driven by an oscillating
electric poten... | 1411.2492v1 |
2015-04-20 | On the Riesz basis property of root vectors system for $2 \times 2$ Dirac type operators | The paper is concerned with the Riesz basis property of a boundary value
problem associated in $L^2[0,1] \otimes \mathbb{C}^2$ with the following $2
\times 2$ Dirac type equation $$ L y = -i B^{-1} y' + Q(x) y = \lambda y, \quad
B = \begin{pmatrix} b_1 & 0 \\ 0 & b_2 \end{pmatrix}, \quad y = \begin{pmatrix}
y_1 \\ y_2 ... | 1504.04954v2 |
2015-10-14 | Fermi surface versus Fermi sea contributions to intrinsic anomalous and spin Hall effects of multiorbital metals in the presence of Coulomb interaction and spin-Coulomb drag | Anomalous Hall effect (AHE) and spin Hall effect (SHE) are fundamental
phenomena, and their potential for application is great. However, we understand
the interaction effects unsatisfactorily, and should have clarified issues
about the roles of the Fermi sea term and Fermi surface term of the
conductivity of the intrin... | 1510.03988v5 |
2016-05-02 | Cosmic Galaxy-IGM HI Relation at ${\it{z}}\sim 2-3$ Probed in the COSMOS/UltraVISTA $1.6$ deg$^2$ Field | We present spatial correlations of galaxies and IGM HI in the
COSMOS/UltraVISTA 1.62 deg$^2$ field. Our data consist of 13,415 photo-$z$
galaxies at $z\sim2-3$ with $K_s<23.4$ and the Ly$\alpha$ forest absorptions in
the background quasar spectra selected from SDSS data with no signature of
damped Ly$\alpha$ system con... | 1605.00379v3 |
2016-10-19 | New scenario of turbulence theory and wall-bounded turbulence: Theoretical significance | General scenario of turbulence theory is proposed and applied to streaky
wall-bounded turbulence. This scenario introduces a new field of transverse
waves. Significance of the theory rests on a mathematical theorem associated
with the conservation law of current flux, expressed in a form of 4d physical
space-time repre... | 1610.05975v2 |
2016-11-22 | The cross-correlation between 21cm intensity mapping maps and the Lyman-alpha forest in the post-reionization era | We investigate the cross-correlation signal between 21cm intensity mapping
maps and the Lyman-alpha forest in the fully non-linear regime using
state-of-the-art hydrodynamic simulations. The cross-correlation signal between
these fields can provide a coherent and comprehensive picture of the neutral
hydrogen (HI) conte... | 1611.07527v2 |
2017-02-02 | Bouncing on Titan: Motion of the Huygens Probe in the Seconds After Landing | While landing on Titan, several instruments onboard Huygens acquired
measurements that indicate the probe did not immediately come to rest. Detailed
knowledge of the probe's motion can provide insight into the nature of Titan's
surface. Combining accelerometer data from the Huygens Atmospheric Structure
Instrument (HAS... | 1702.00667v1 |
2017-06-26 | Parsing spatiotemporal dynamical stability in ECoG during seizure onset, propagation, and termination | Understanding brain dynamics in epilepsy is critical for establishing
rigorous control objectives that enable new therapeutic methods to mitigate
seizure occurrence. In multichannel electrocorticography (ECoG) recordings
acquired in 21 subjects during a total of 94 seizures, we apply dynamical
systems stability analysi... | 1706.08202v1 |
2017-10-05 | Cross section alignment of polycyclic aromatic hydrocarbons by anisotropic radiation | We study the effect of anisotropic radiation illumination on the alignment of
polycyclic aromatic hydrocarbons (PAHs) and report that cross-sectional
mechanism of alignment earlier considered in terms of gas-grain interactions
can also be efficient for the photon-grain interaction. We demonstrate this by
first calculat... | 1710.01835v2 |
2018-06-01 | Kinetic Model for Stochastic Heating in the INCA Discharge | A novel electron heating mechanism based on periodically structured vortex
fields induced in a plane was first proposed in 2014 [U. Czarnetzki and Kh.
Tarnev, Physics of Plasmas 21, 123508 (2014)]. This theoretical concept has now
been realized in an experiment which confirms efficient collisionless heating
in such arr... | 1806.00505v2 |
2019-01-09 | Wave heating in gravitationally stratified coronal loops in the presence of resistivity and viscosity | In recent years, coronal loops have been the focus of studies related to the
damping of different magnetohydrodynamic (MHD) surface waves and their
connection with coronal seismology and wave heating. For a better understanding
of wave heating, we need to take into account the effects of different
dissipation coefficie... | 1901.02676v2 |
2019-01-31 | Analysis and active control of geometrically nonlinear responses of smart FG porous plates with graphene nanoplatelets reinforcement based on Bézier extraction of NURBS | In this paper, we propose an effective computational approach to analyze and
active control of geometrically nonlinear responses of functionally graded (FG)
porous plates with graphene nanoplatelets (GPLs) reinforcement integrated with
piezoelectric layers. The key concept behind this work is to utilize
isogeometric an... | 1902.10806v2 |
2019-04-18 | Cosmic-ray transport from AMS-02 B/C data: benchmark models and interpretation | This article aims at establishing new benchmark scenarios for Galactic
cosmic-ray propagation in the GV-TV rigidity range, based on fits to the AMS-02
B/C data with the USINE v3.5 propagation code. We employ a new fitting
procedure, cautiously taking into account data systematic error correlations in
different rigidity... | 1904.08917v2 |
2019-05-06 | Formation and decay of eddy currents generated by crossed surface waves | The mass-transport induced by crossed surface waves consists of the Stokes
and Euler contributions which are very different in nature. The first
contribution is a generalization of Stokes drift for a plane wave in ideal
fluid and the second contribution arises due to the fluid viscosity and it is
excited by a force app... | 1905.01875v2 |
2019-10-30 | A priori bounds for the $Φ^4$ equation in the full sub-critical regime | We derive a priori bounds for the $\Phi^4$ equation in the full sub-critical
regime using Hairer's theory of regularity structures. The equation is formally
given by \begin{equation} \label{e}(\partial_t-\Delta)\phi = -\phi^3 + \infty
\phi +\xi, \tag{$\star$} \end{equation} where the term $+\infty \phi$
represents infi... | 1910.13854v2 |
2019-11-18 | Wave measurements from ship mounted sensors in the Arctic marginal ice zone | Increased research interest and economic activity in the Arctic raise the
need for new observations of sea ice dynamics. Remote sensing as well as
mathematical and numerical models of wave propagation in sea ice would benefit
from more in situ data for validation. This study presents wave measurements in
the marginal i... | 1911.07612v2 |
2020-08-02 | Phase Diagram, Stability and Magnetic Properties of Nonlinear Excitations in Spinor Bose-Einstein Condensates | We present the phase diagram, the underlying stability and magnetic
properties as well as the dynamics of nonlinear solitary wave excitations
arising in the distinct phases of a harmonically confined spinor $F=1$
Bose-Einstein condensate. Particularly, it is found that nonlinear excitations
in the form of dark-dark-bri... | 2008.00475v3 |
2021-02-18 | On stochastic heating and its phase-space signatures in low-$β$ kinetic turbulence | We revisit the theory of stochastic heating of ions and investigate its
phase-space signatures in kinetic turbulence of relevance to low-$\beta$
portions of the solar wind. We retain a full scale-dependent approach in our
treatment, and consider the case in which electric-field fluctuations can be
described by a genera... | 2102.09654v2 |
2021-06-16 | Accurate and efficient hydrodynamic analysis of structures with sharp edges by the Extended Finite Element Method (XFEM): 2D studies | Achieving accurate numerical results of hydrodynamic loads based on the
potential-flow theory is very challenging for structures with sharp edges, due
to the singular behavior of the local-flow velocities. In this paper, we
introduce the Extended Finite Element Method (XFEM) to solve fluid-structure
interaction problem... | 2106.08620v2 |
2021-06-25 | Validity of point-mass model in off-resonance dynamic atomic force microscopy | The quantitative measurement of viscoelasticity of nano-scaleentities is an
important goal of nanotechnology research and there is considerable progress
with advent of dynamic Atomic Force Microscopy. The hydrodynamics of
cantilever, the force sensor in AFM measurements, plays a pivotal role in
quantitative estimates o... | 2106.13631v1 |
2021-11-20 | Current noise and Keldysh vertex function of an Anderson impurity in the Fermi liquid regime | We present a complete microscopic Fermi-liquid description for
next-to-leading order transport through an Anderson impurity under a finite
bias voltage $V$. It is applicable to multilevel quantum dots without
particle-hole or time-reversal symmetry, and is constructed based on the
nonequilibrium Keldysh formalism, taki... | 2111.10483v2 |
2021-12-01 | Numerical Study of Cosmic Ray Confinement through Dust Resonant Drag Instabilities | We investigate the possibility of cosmic ray (CR) confinement by charged dust
grains through resonant drag instabilities (RDIs). We perform
magnetohydrodynamic particle-in-cell simulations of magnetized gas mixed with
charged dust and cosmic rays, with the gyro-radii of dust and GeV CRs on
$\sim\mathrm{AU}$ scales full... | 2112.00752v2 |
2022-03-09 | A comparison of variational upwinding schemes for geophysical fluids, and their application to potential enstrophy conserving discretisations | Methods for upwinding the potential vorticity in a compatible finite element
discretisation of the rotating shallow water equations are studied. These
include the well-known anticipated potential vorticity method (APVM),
streamwise upwind Petrov-Galerkin (SUPG) method, and a recent approach where
the trial functions ar... | 2203.04629v3 |
2022-03-26 | Ion Alfvén velocity fluctuations and implications for the diffusion of streaming cosmic rays | The interstellar medium (ISM) of star-forming galaxies is magnetized and
turbulent. Cosmic rays (CRs) propagate through it, and those with energies from
$\sim\,\rm{GeV} - \rm{TeV}$ are likely subject to the streaming instability,
whereby the wave damping processes balances excitation of resonant ionic
Alfv\'en waves by... | 2203.13952v3 |
2022-06-24 | Data-driven reduced order models using invariant foliations, manifolds and autoencoders | This paper explores how to identify a reduced order model (ROM) from a
physical system. A ROM captures an invariant subset of the observed dynamics.
We find that there are four ways a physical system can be related to a
mathematical model: invariant foliations, invariant manifolds, autoencoders and
equation-free models... | 2206.12269v3 |
2022-10-23 | Tidally excited gravity waves in the cores of solar-type stars: resonances and critical-layer formation | We simulate the propagation and dissipation of tidally induced nonlinear
gravity waves in the cores of solar-type stars. We perform hydrodynamical
simulations of a previously developed Boussinesq model using a spectral-element
code to study the stellar core as a wave cavity that is periodically forced at
the outer boun... | 2210.12880v2 |
1993-06-22 | Weakly Damped Modes in Star Clusters and Galaxies | A perturber may excite a coherent mode in a star cluster or galaxy. If the
stellar system is stable, it is commonly assumed that such a mode will be
strongly damped and therefore of little practical consequence other than
redistributing momentum and energy deposited by the perturber. This paper
demonstrates that this a... | 9306020v1 |
1997-12-03 | On the Evolution of Damped Lyman Alpha Systems to Galactic Disks | The mean metallicity of the thick disk of the Galaxy is 0.5 dex higher than
that of the damped Lyman alpha systems. This has been interpreted to argue that
stars in the former do not arise out of gas in the latter. Using new
metallicity and H I column-density data we show the metal-rich damped systems
do contain suffic... | 9712050v1 |
1998-10-23 | Chemical Abundances of the Damped Lya Systems at z>1.5 | We present chemical abundance measurements for 19 damped lya systems observed
with HIRES on the 10m W.M. Keck Telescope. Our principal goal is to investigate
the abundance patterns of the damped systems and thereby determine the
underlying physical processes which dominate their chemical evolution. We place
particular ... | 9810381v1 |
2002-04-03 | The role of damped Alfven waves on magnetospheric accretion models of young stars | We examine the role of Alfven wave damping in heating the plasma in the
magnetic funnels of magnetospheric accretion models of young stars. We study
four different damping mechanisms of the Alfven waves: nonlinear, turbulent,
viscous-resistive and collisional. Two different possible origins for the
Alfven waves are dis... | 0204056v1 |
2009-09-19 | Resonantly Damped Kink Magnetohydrodynamic Waves in a Partially Ionized Filament Thread | Transverse oscillations of solar filament and prominence threads have been
frequently reported. These oscillations have the common features of being of
short period (2-10 min) and being damped after a few periods. Kink
magnetohydrodynamic (MHD) wave modes have been proposed as responsible for the
observed oscillations,... | 0909.3599v1 |
2009-10-15 | Time damping of non-adiabatic magnetohydrodynamic waves in a partially ionized prominence plasma: Effect of helium | Prominences are partially ionized, magnetized plasmas embedded in the solar
corona. Damped oscillations and propagating waves are commonly observed. These
oscillations have been interpreted in terms of magnetohydrodynamic (MHD) waves.
Ion-neutral collisions and non-adiabatic effects (radiation losses and thermal
conduc... | 0910.2883v1 |
2009-12-21 | The effect of longitudinal flow on resonantly damped kink oscillations | The most promising mechanism acting towards damping the kink oscillations of
coronal loops is resonant absorption. In this context most of previous studies
neglected the effect of the obvious equilibrium flow along magnetic field
lines. The flows are in general sub-Alfv\'enic and hence comparatively slow.
Here we inves... | 0912.4136v1 |
2010-07-12 | Seismology of Standing Kink Oscillations of Solar Prominence Fine Structures | We investigate standing kink magnetohydrodynamic (MHD) oscillations in a
prominence fine structure modeled as a straight and cylindrical magnetic tube
only partially filled with the prominence material, and with its ends fixed at
two rigid walls representing the solar photosphere. The prominence plasma is
partially ion... | 1007.1959v2 |
2012-10-30 | Mode- and size-dependent Landau-Lifshitz damping in magnetic nanostructures: Evidence for non-local damping | We demonstrate a strong dependence of the effective damping on the nanomagnet
size and the particular spin-wave mode that can be explained by the theory of
intralayer transverse-spin-pumping. The effective Landau-Lifshitz damping is
measured optically in individual, isolated nanomagnets as small as 100 nm. The
measurem... | 1210.8118v3 |
2012-11-21 | Kinetic theory of surface plasmon polariton in semiconductor nanowires | Based on the semiclassical model Hamiltonian of the surface plasmon polariton
and the nonequilibrium Green-function approach, we present a microscopic
kinetic theory to study the influence of the electron scattering on the
dynamics of the surface plasmon polariton in semiconductor nanowires. The
damping of the surface ... | 1211.5055v2 |
2013-11-12 | Damping filter method for obtaining spatially localized solutions | Spatially localized structures are key components of turbulence and other
spatio-temporally chaotic systems. From a dynamical systems viewpoint, it is
desirable to obtain corresponding exact solutions, though their existence is
not guaranteed. A damping filter method is introduced to obtain variously
localized solution... | 1311.2792v2 |
2014-09-19 | Highly confined low-loss plasmons in graphene-boron nitride heterostructures | Graphene plasmons were predicted to possess ultra-strong field confinement
and very low damping at the same time, enabling new classes of devices for deep
subwavelength metamaterials, single-photon nonlinearities, extraordinarily
strong light-matter interactions and nano-optoelectronic switches. While all of
these grea... | 1409.5674v1 |
2015-09-02 | Energy Dependence of Synchrotron X-Ray Rims in Tycho's Supernova Remnant | Several young supernova remnants exhibit thin X-ray bright rims of
synchrotron radiation at their forward shocks. Thin rims require strong
magnetic field amplification beyond simple shock compression if rim widths are
only limited by electron energy losses. But, magnetic field damping behind the
shock could produce sim... | 1509.00877v1 |
2016-02-02 | Forward Modelling of Propagating Slow Waves in Coronal Loops and Their Frequency-Dependent Damping | Propagating slow waves in coronal loops exhibit a damping which depends upon
the frequency of the waves. In this study we aim to investigate the
relationship of the damping length (L$_d$) with the frequency of the
propagating wave. We present a 3-D coronal loop model with uniform density and
temperature and investigate... | 1602.00787v1 |
2016-05-11 | Damping of prominence longitudinal oscillations due to mass accretion | We study the damping of longitudinal oscillations of a prominence thread
caused by the mass accretion. In this model we considered a thin curved
magnetic tube filled with the plasma. The parts of the tube at the two sides of
the thread are filled with hot rarefied plasma. We assume that there are flows
of rarefied plas... | 1605.03376v1 |
2016-11-17 | Inductive detection of field-like and damping-like AC inverse spin-orbit torques in ferromagnet/normal metal bilayers | Functional spintronic devices rely on spin-charge interconversion effects,
such as the reciprocal processes of electric field-driven spin torque and
magnetization dynamics-driven spin and charge flow. Both damping-like and
field-like spin-orbit torques have been observed in the forward process of
current-driven spin to... | 1611.05798v2 |
2016-12-30 | Spectroscopic evidence of Alfvén wave damping in the off-limb solar corona | We investigate off-limb active region and quiet Sun corona using
spectroscopic data. Active region is clearly visible in several spectral lines
formed in the temperature range of 1.1--2.8 MK. We derive electron number
density using line ratio method, and non-thermal velocity in the off-limb
region up to the distance of... | 1612.09551v2 |
2017-01-04 | Controlling plasmon modes and damping in buckled two-dimensional material open systems | Full ranges of both hybrid plasmon-mode dispersions and their damping are
studied systematically by our recently developed mean-field theory in open
systems involving a conducting substrate and a two-dimensional (2D) material
with a buckled honeycomb lattice, such as silicene, germanene, and a group
\rom{4} dichalcogen... | 1701.01084v1 |
2017-04-05 | Stimulated Brillouin scattering behaviors in different species ignition hohlraum plasmas in high-temperature and high-density region | The presence of multiple ion species can add additional branches to the IAW
dispersion relation and change the Landau damping significantly. Different IAW
modes excited by stimulated Brillouin scattering (SBS) and different SBS
behaviors in several typical ignition hohlraum plasmas in the high-temperature
and high-dens... | 1704.02317v1 |
2017-06-29 | Resonant Absorption of Axisymmetric Modes in Twisted Magnetic Flux Tubes | It has been shown recently that magnetic twist and axisymmetric MHD modes are
ubiquitous in the solar atmosphere and therefore, the study of resonant
absorption for these modes have become a pressing issue as it can have
important consequences for heating magnetic flux tubes in the solar atmosphere
and the observed dam... | 1706.09665v1 |
2017-08-16 | Damping of an oscillating scalar field indirectly coupled to a thermal bath | The damping process of a homogeneous oscillating scalar field that indirectly
interacts with a thermal bath through a mediator field is investigated over a
wide range of model parameters. We consider two types of mediator fields, those
that can decay to the thermal bath and those that are individually stable but
pair a... | 1708.04865v2 |
2018-09-14 | Continuous and discrete damping reduction for systems with quadratic interaction | We study the connection between Lagrangian and Hamiltonian descriptions of
closed/open dynamics, for a collection of particles with quadratic interaction
(closed system) and a sub-collection of particles with linear damping (open
system). We consider both continuous and discrete versions of mechanics. We
define the Dam... | 1809.05532v1 |
2019-03-02 | Complex Stiffness Model of Physical Human-Robot Interaction: Implications for Control of Performance Augmentation Exoskeletons | Human joint dynamic stiffness plays an important role in the stability of
performance augmentation exoskeletons. In this paper, we consider a new
frequency domain model of the human joint dynamics which features a complex
value stiffness. This complex stiffness consists of a real stiffness and a
hysteretic damping. We ... | 1903.00704v4 |
2020-05-31 | Optimal decay rates of the compressible Euler equations with time-dependent damping in $\mathbb R^n$: (II) over-damping case | This paper is concerned with the multi-dimensional compressible Euler
equations with time-dependent over-damping of the form
$-\frac{\mu}{(1+t)^\lambda}\rho\boldsymbol u$ in $\mathbb R^n$, where $n\ge2$,
$\mu>0$, and $\lambda\in[-1,0)$. This continues our previous work dealing with
the under-damping case for $\lambda\i... | 2006.00403v1 |
2020-07-07 | Nonlinear viscoelastic isolation for seismic vibration mitigation | The aim of this paper is to assess the effectiveness of nonlinear
viscoelastic damping in controlling base-excited vibrations. Specifically, the
focus is on investigating the robustness of the nonlinear base isolation
performance in controlling the system response due to a wide set of possible
excitation spectra. The d... | 2007.04378v1 |
2021-01-20 | Damped perturbations in stellar systems: Genuine modes and Landau-damped waves | This research was stimulated by the recent studies of damping solutions in
dynamically stable spherical stellar systems. Using the simplest model of the
homogeneous stellar medium, we discuss nontrivial features of stellar systems.
Taking them into account will make it possible to correctly interpret the
results obtain... | 2101.08287v2 |
2021-03-10 | Dynamical Pose Estimation | We study the problem of aligning two sets of 3D geometric primitives given
known correspondences. Our first contribution is to show that this primitive
alignment framework unifies five perception problems including point cloud
registration, primitive (mesh) registration, category-level 3D registration,
absolution pose ... | 2103.06182v3 |
2021-04-13 | Apparent nonlinear damping triggered by quantum fluctuations | Nonlinear damping, the change in damping rate with the amplitude of
oscillations plays an important role in many electrical, mechanical and even
biological oscillators. In novel technologies such as carbon nanotubes,
graphene membranes or superconducting resonators, the origin of nonlinear
damping is sometimes unclear.... | 2104.06464v2 |
2023-07-26 | Improving frequency response with synthetic damping available from fleets of distributed energy resources | With the increasing use of renewable generation in power systems, responsive
resources will be necessary to support primary frequency control in future
low-inertia/under-damped power systems. Flexible loads can provide
fast-frequency response services if coordinated effectively. However, practical
implementations of su... | 2307.14498v1 |
2023-12-11 | Possible Contamination of the Intergalactic Medium Damping Wing in ULAS J1342+0928 by Proximate Damped Ly$α$ Absorption | The red damping wing from neutral hydrogen in the intergalactic medium is a
smoking-gun signal of ongoing reionization. One potential contaminant of the
intergalactic damping wing signal is dense gas associated with foreground
galaxies, which can give rise to proximate damped Ly$\alpha$ absorbers. The
Ly$\alpha$ imprin... | 2312.06747v1 |
2024-02-13 | Forecasts for Constraining Lorentz-violating Damping of Gravitational Waves from Compact Binary Inspirals | Violation of Lorentz symmetry can result in two distinct effects in the
propagation of the gravitational waves (GWs). One is a modified dispersion
relation and another is a frequency-dependent damping of GWs. While the former
has been extensively studied in the literature, in this paper we concentrate on
the frequency-... | 2402.08240v1 |
2024-03-13 | Thermal Hall effect incorporating magnon damping in localized spin systems | We propose a theory for thermal Hall transport mediated by magnons to address
the impact of their damping resulting from magnon-magnon interactions in
insulating magnets. This phenomenon is anticipated to be particularly
significant in systems characterized by strong quantum fluctuations,
exemplified by spin-1/2 system... | 2403.08478v1 |
2024-04-02 | A recipe for eccentricity and inclination damping for partial gap opening planets in 3D disks | In a previous paper we showed that, like the migration speed, the
eccentricity damping efficiency is modulated linearly by the depth of the
partial gap a planet carves in the disk surface density profile, resulting in
less efficient $e$-damping compared to the prescription commonly used in
population synthesis works. H... | 2404.02247v1 |
2009-08-21 | Surface Alfven Wave Damping in a 3D Simulation of the Solar Wind | Here we investigate the contribution of surface Alfven wave damping to the
heating of the solar wind in minima conditions. These waves are present in
regions of strong inhomogeneities in density or magnetic field (e. g., the
border between open and closed magnetic field lines). Using a 3-dimensional
Magnetohydrodynamic... | 0908.3146v1 |
2017-11-21 | Determination of spin Hall effect and spin diffusion length of Pt from self-consistent fitting of damping enhancement and inverse spin-orbit torque measurements | Understanding the evolution of spin-orbit torque (SOT) with increasing
heavy-metal thickness in ferromagnet/normal metal (FM/NM) bilayers is critical
for the development of magnetic memory based on SOT. However, several
experiments have revealed an apparent discrepancy between damping enhancement
and damping-like SOT r... | 1711.07654v2 |
2019-09-19 | Nonlinear energy loss in the oscillations of coated and uncoated bubbles: Role of thermal, radiation damping and encapsulating shell at various excitation pressures | A simple generalized model (GM) for coated bubbles accounting for the effect
of compressibility of the liquid is presented. The GM was then coupled with
nonlinear ODEs that account for the thermal effects. Starting with mass and
momentum conservation equations for a bubbly liquid and using the GM, nonlinear
pressure de... | 1909.08793v1 |
2020-11-20 | The effect of magnetic field on the damping of slow waves in the solar corona | Slow magnetoacoustic waves are routinely observed in astrophysical plasma
systems such as the solar corona. As a slow wave propagates through a plasma,
it modifies the equilibrium quantities of density, temperature, and magnetic
field. In the corona and other plasma systems, the thermal equilibrium is
comprised of a ba... | 2011.10437v1 |
1997-11-25 | Abundances of Heavy Elements and CO Molecules in High Redshift Damped Lyman-alpha Galaxies | Damped Lyman-alpha systems seen in spectra of background quasars are
generally thought to represent high redshift counterparts of present-day
galaxies. We summarize observations of heavy element abundances in damped
Lyman-alpha systems. The results of a systematic search for CO and C II*
absorption in 17 damped Lyman-a... | 9711298v1 |
1997-12-05 | Magnetohydrodynamics in the Early Universe and the Damping of Non-linear Alfven Waves | The evolution and viscous damping of cosmic magnetic fields in the early
universe, is analysed. Using the fact that the fluid, electromagnetic, and
shear viscous energy-momentum tensors are all conformally invariant, the
evolution is transformed from the expanding universe setting into that in flat
spacetime. Particula... | 9712083v1 |
2001-08-09 | Are Simulations of CDM Consistent with Galactic-Scale Observations at High Redshift? | We compare new observations on the kinematic characteristics of the damped
Lya systems against results from numerical SPH simulations to test the
predictions of hierarchical galaxy formation. This exercise is particularly
motivated by recent numerical results on the cross-section of damped Lya
systems. Our analysis foc... | 0108154v1 |
2003-03-19 | Distinct Abundance Patterns in Multiple Damped Ly-alpha Galaxies: Evidence for Truncated Star Formation? | (abridged) Following our previous work on metal abundances of a double damped
Ly-alpha system with a line-of-sight separation ~2000 km/s (Ellison & Lopez
2001), we present VLT UVES abundances of 3 new systems spanning a total of
\~6000 km/s at z~2.5 toward the southern QSO CTQ247. These abundances are
supplemented with... | 0303441v1 |
2003-05-16 | New Damped Lya Metallicities from ESI Spectroscopy of Five Palomar Sky Survey Quasars | This paper presents chemical abundance measurements for 12 new z>3 damped Lya
systems discovered toward five quasars from the Palomar Sky Survey. We
determine HI column densities from profile fits to the observed damped Lya
profiles and measure ionic column densities and limits for all observed
metal-line transitions. ... | 0305313v1 |
2006-07-06 | Ekman layer damping of r-modes revisited | We investigate the damping of neutron star r-modes due to the presence of a
viscous boundary (Ekman) layer at the interface between the crust and the core.
Our study is motivated by the possibility that the gravitational-wave driven
instability of the inertial r-modes may become active in rapidly spinning
neutron stars... | 0607105v2 |
1997-11-05 | Hydrodynamic damping in trapped Bose gases | Griffin, Wu and Stringari have derived the hydrodynamic equations of a
trapped dilute Bose gas above the Bose-Einstein transition temperature. We give
the extension which includes hydrodynamic damping, following the classic work
of Uehling and Uhlenbeck based on the Chapman-Enskog procedure. Our final
result is a close... | 9711036v4 |
1998-05-01 | Finite Temperature Perturbation Theory for a Spatially Inhomogeneous Bose-condensed Gas | We develop a finite temperature perturbation theory (beyond the mean field)
for a Bose-condensed gas and calculate temperature-dependent damping rates and
energy shifts for Bogolyubov excitations of any energy. The theory is
generalized for the case of excitations in a spatially inhomogeneous (trapped)
Bose-condensed g... | 9805015v2 |
2003-10-18 | Experiment and Dynamic Simulations of Radiation Damping of Laser-polarized liquid 129Xe at low magnetic field in a flow system | Radiation damping is generally observed when the sample with high spin
concentration and high gyro-magnetic ratio is placed in a high magnetic field.
However, we firstly observed liquid state 129Xe radiation damping using
laser-enhanced nuclear polarization at low magnetic field in a flow system in
which the polarizati... | 0310435v1 |
2004-03-25 | XMCD characterization of rare-earth dopants in Ni$_{81}$Fe$_{19}$(50nm): microscopic basis of engineered damping | We present direct evidence for the contribution of local orbital moments to
the damping of magnetization precession in magnetic thin films. Using x-ray
magnetic circular dichroism (XMCD) characterization of rare-earth (RE)
M$_{4,5}$ edges in Ni$_{81}$Fe$_{19}$ doped with $<$ 2% Gd and Tb, we show that
the enhancement o... | 0403627v1 |
2005-02-08 | Landau Damping of Spin Waves in Trapped Boltzmann Gases | A semiclassical method is used to study Landau damping of transverse
pseudo-spin waves in harmonically trapped ultracold gases in the collisionless
Boltzmann limit. In this approach, the time evolution of a spin is calculated
numerically as it travels in a classical orbit through a spatially dependent
mean field. This ... | 0502189v1 |
2005-06-01 | Landau damping of Bogoliubov excitations in optical lattices at finite temperature | We study the damping of Bogoliubov excitations in an optical lattice at
finite temperatures. For simplicity, we consider a Bose-Hubbard tight-binding
model and limit our analysis to the lowest excitation band. We use the Popov
approximation to calculate the temperature dependence of the number of
condensate atoms $n^{\... | 0506016v1 |
2006-06-15 | Landau damping: instability mechanism of superfluid Bose gases moving in optical lattices | We investigate Landau damping of Bogoliubov excitations in a dilute Bose gas
moving in an optical lattice at finite temperatures. Using a 1D tight-binding
model, we explicitly obtain the Landau damping rate, the sign of which
determines the stability of the condensate. We find that the sign changes at a
certain condens... | 0606398v2 |
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