publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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1996-08-14 | Ginzburg-Landau-Gor'kov Theory of Magnetic oscillations in a type-II 2-dimensional Superconductor | We investigate de Haas-van Alphen (dHvA) oscillations in the mixed state of a
type-II two-dimensional superconductor within a self-consistent Gor'kov
perturbation scheme. Assuming that the order parameter forms a vortex lattice
we can calculate the expansion coefficients exactly to any order. We have
tested the results... | 9608004v3 |
2007-10-04 | Detailed Examination of Transport Coefficients in Cubic-Plus-Quartic Oscillator Chains | We examine the thermal conductivity and bulk viscosity of a one-dimensional
(1D) chain of particles with cubic-plus-quartic interparticle potentials and no
on-site potentials. This system is equivalent to the FPU-alpha beta system in a
subset of its parameter space. We identify three distinct frequency regimes
which we... | 0710.1066v1 |
2008-01-01 | Radiative torques alignment in the presence of pinwheel torques | We study the alignment of grains subject to both radiative torques and
pinwheel torques while accounting for thermal flipping of grains. By pinwheel
torques we refer to all systematic torques that are fixed in grain body axes,
including the radiative torques arising from scattering and absorption of
isotropic radiation... | 0801.0266v2 |
2008-09-09 | Turbulent Convection in Stellar Interiors. II. The Velocity Field | We analyze stellar convection with the aid of 3D hydrodynamic simulations,
introducing the turbulent cascade into our theoretical analysis. We devise
closures of the Reynolds-decomposed mean field equations by simple physical
modeling of the simulations (we relate temperature and density fluctuations via
coefficients);... | 0809.1625v2 |
2011-04-04 | The underlying physical meaning of the $ν_{\rm max}-ν_{\rm c}$ relation | Asteroseismology of stars that exhibit solar-like oscillations are enjoying a
growing interest with the wealth of observational results obtained with the
CoRoT and Kepler missions. In this framework, scaling laws between
asteroseismic quantities and stellar parameters are becoming essential tools to
study a rich variet... | 1104.0630v2 |
2012-04-09 | Global MRI with Braginskii viscosity in a galactic profile | We present a global-in-radius linear analysis of the axisymmetric
magnetorotational instability (MRI) in a collisional magnetized plasma with
Braginskii viscosity. For a galactic angular velocity profile $\Omega$ we
obtain analytic solutions for three magnetic field orientations: purely
azimuthal, purely vertical and s... | 1204.1948v1 |
2012-10-25 | Gravitational bremsstrahlung in ultra-planckian collisions | A classical computation of gravitational bremsstrahlung in ultra-planckian
collisions of massive point particles is presented in an arbitrary number d of
toroidal or non-compact extra dimensions. Our method generalizes the
post-linear formalism of General Relativity to the multidimensional case. The
total emitted energ... | 1210.6976v1 |
2013-07-29 | Shear shocks in fragile networks | A minimal model for studying the mechanical properties of amorphous solids is
a disordered network of point masses connected by unbreakable springs. At a
critical value of its mean connectivity, such a network becomes fragile: it
undergoes a rigidity transition signaled by a vanishing shear modulus and
transverse sound... | 1307.7665v1 |
2014-01-30 | From the Samuelson Volatility Effect to a Samuelson Correlation Effect: Evidence from Crude Oil Calendar Spread Options | We introduce a multi-factor stochastic volatility model based on the
CIR/Heston stochastic volatility process. In order to capture the Samuelson
effect displayed by commodity futures contracts, we add expiry-dependent
exponential damping factors to their volatility coefficients. The pricing of
single underlying Europea... | 1401.7913v3 |
2014-02-04 | Complete Tidal Evolution of Pluto-Charon | Both Pluto and its satellite Charon have rotation rates synchronous with
their orbital mean motion. This is the theoretical end point of tidal evolution
where transfer of angular momentum has ceased. Here we follow Pluto's tidal
evolution from an initial state having the current total angular momentum of
the system but... | 1402.0625v1 |
2014-07-11 | Chiral Hall Effect and Chiral Electric Waves | We investigate the vector and axial currents induced by external
electromagnetic fields and chemical potentials in chiral systems at finite
temperature. Similar to the normal Hall effect, we find that an axial Hall
current is generated in the presence of the electromagnetic fields along with
an axial chemical potential... | 1407.3168v3 |
2014-09-01 | Interface-resolved direct numerical simulation of the erosion of a sediment bed sheared by laminar channel flow | A numerical method based upon the immersed boundary technique for the
fluid-solid coupling and on a soft-sphere approach for solid-solid contact is
used to perform direct numerical simulation of the flow-induced motion of a
thick bed of spherical particles in a horizontal plane channel. The collision
model features a n... | 1409.0339v1 |
2014-10-28 | Equations of a Moving Mirror and the Electromagnetic Field | We consider a system composed of a mobile slab and the electromagnetic field.
We assume that the slab is made of a material that has the following properties
when it is at rest: it is linear, isotropic, non-magnetizable, and ohmic with
zero free charge density. Using instantaneous Lorentz transformations, we
deduce the... | 1410.7609v2 |
2014-12-17 | Fluctuation-dissipation dynamics of cosmological scalar fields | We show that dissipative effects have a significant impact on the evolution
of cosmological scalar fields, leading to friction, entropy production and
field fluctuations. We explicitly compute the dissipation coefficient for
different scalar fields within the Standard Model and some of its most widely
considered extens... | 1412.5489v2 |
2014-12-22 | H$_2$ Lyman and Werner band lines and their sensitivity for a variation of the proton-electron mass ratio in the gravitational potential of white dwarfs | Recently an accurate analysis of absorption spectra of molecular hydrogen,
observed with the Cosmic Origins Spectrograph aboard the Hubble Space
Telescope, in the photosphere of white dwarf stars GD133 and GD29-38 was
published in a Letter [Phys. Rev. Lett. 113, 123002 (2014)], yielding a
constraint on a possible depen... | 1412.6920v1 |
2014-12-11 | Modeling the Aerodynamic Lift Produced by Oscillating Airfoils at Low Reynolds Number | For present study, setting Strouhal Number (St) as control parameter,
numerical simulations for flow past oscillating NACA-0012 airfoil at 1,000
Reynolds Numbers (Re) are performed. Temporal profiles of unsteady forces; lift
and thrust, and their spectral analysis clearly indicate the solution to be a
period-1 attracto... | 1502.06431v1 |
2015-03-09 | Boundedness in a quasilinear fully parabolic Keller-Segel system of higher dimension with logistic source | This paper deals with the higher dimension quasilinear parabolic-parabolic
Keller-Segel system involving a source term of logistic type $
u_t=\nabla\cdot(\phi(u)\nabla u)-\chi\nabla\cdot(u\nabla v)+g(u)$, $\tau
v_t=\Delta v-v+u$ in $\Omega\times (0,T)$, subject to nonnegative initial data
and homogeneous Neumann bounda... | 1503.02387v1 |
2015-03-16 | Effect of primordial magnetic fields on the ionization history | Primordial magnetic fields (PMF) damp at scales smaller than the photon
diffusion and free-streaming scale. This leads to heating of ordinary matter
(electrons and baryons), which affects both the thermal and ionization history
of our Universe. Here, we study the effect of heating due to ambipolar
diffusion and decayin... | 1503.04827v1 |
2015-11-18 | Gravito-inertial waves in a differentially rotating spherical shell | The gravito-inertial waves propagating over a shellular baroclinic flow
inside a rotating spherical shell are analysed using the Boussinesq
approximation. The wave properties are examined by computing paths of
characteristics in the non-dissipative limit, and by solving the full
dissipative eigenvalue problem using a h... | 1511.05832v2 |
2016-02-02 | Reflected brownian motion: selection, approximation and linearization | We construct a family of SDEs whose solutions select a reflected Brownian
flow as well as a stochastic damped transport process (W\_t). The latter gives
a representation for the solutions to the heat equation for differential
1-forms with the absolute boundary conditions; it evolves pathwise by the Ricci
curvature in t... | 1602.00897v4 |
2016-02-06 | Basic Properties of Conductivity and Normal Hall Effect in the Periodic Anderson Model | Exact formulas of diagonal conductivity $\sigma_{xx}$ and Hall conductivity
$\sigma_{xy}$ are derived from the Kubo formula in hybridized two-orbital
systems with arbitrary band dispersions. On the basis of the theoretical
framework for the Fermi liquid based on these formulas, the ground-state
properties of the period... | 1602.02229v1 |
2016-03-28 | Kernelized Weighted SUSAN based Fuzzy C-Means Clustering for Noisy Image Segmentation | The paper proposes a novel Kernelized image segmentation scheme for noisy
images that utilizes the concept of Smallest Univalue Segment Assimilating
Nucleus (SUSAN) and incorporates spatial constraints by computing circular
colour map induced weights. Fuzzy damping coefficients are obtained for each
nucleus or center p... | 1603.08564v1 |
2016-06-11 | Characterization of base roughness for granular chute flows | Base roughness plays an important role to the dynamics of granular flows but
is yet poorly understood due to the difficulty of its quantification. For a
bumpy base made by spheres, at least two factors should be considered to
characterize its geometric roughness, namely the size ratio of base- to
flow-particles and the... | 1606.03554v1 |
2016-06-22 | Non-linear diffusion of cosmic rays escaping from supernova remnants - I. The effect of neutrals | Supernova remnants are believed to be the main sources of galactic Cosmic
Rays (CR). Within this framework, particles are accelerated at supernova
remnant shocks and then released in the interstellar medium. The mechanism
through which CRs are released and the way in which they propagate still remain
open issues. The m... | 1606.06902v2 |
2016-08-29 | Hilbert space hypocoercivity for the Langevin dynamics revisited | We provide a complete elaboration of the $L^2$-Hilbert space hypocoercivity
theorem for the degenerate Langevin dynamics via studying the longtime behavior
of the strongly continuous contraction semigroup solving the associated
Kolmogorov (backward) equation as an abstract Cauchy problem. This
hypocoercivity result is ... | 1608.07889v1 |
2017-04-06 | Evolution of a proto-neutron star with a nuclear many-body equation of state: Neutrino luminosity and gravitational wave frequencies | In a core-collapse supernova, a huge amount of energy is released in the
Kelvin-Helmholtz phase subsequent to the explosion, when the proto-neutron star
cools and deleptonizes as it loses neutrinos. Most of this energy is emitted
through neutrinos, but a fraction of it can be released through gravitational
waves. We mo... | 1704.01923v2 |
2017-05-16 | A Tube Dynamics Perspective Governing Stability Transitions: An Example Based on Snap-through Buckling | The equilibrium configuration of an engineering structure, able to withstand
a certain loading condition, is usually associated with a local minimum of the
underlying potential energy. However, in the nonlinear context, there may be
other equilibria present, and this brings with it the possibility of a
transition to an... | 1705.05903v2 |
2018-02-13 | Acoustic Disturbances in Galaxy Clusters | Galaxy cluster cores are pervaded by hot gas which radiates at far too high a
rate to maintain any semblance of a steady state; this is referred to as the
cooling flow problem. Of the many heating mechanisms that have been proposed to
balance radiative cooling, one of the most attractive is dissipation of
acoustic wave... | 1802.04808v2 |
2018-04-23 | Dissipation-Based Continuation Method for Multiphase Flow in Heterogeneous Porous Media | In reservoir simulation, solution of the coupled systems of nonlinear
algebraic equations that are associated with fully-implicit (backward Euler)
discretization is challenging. Having a robust and efficient nonlinear solver
is necessary in order for reservoir simulation to serve as the primary tool for
managing the re... | 1804.08538v2 |
2018-05-08 | A fast adhesive discrete element method for random packings of fine particles | Introducing a reduced particle stiffness in discrete element method (DEM)
allows for bigger time steps and therefore fewer total iterations in a
simulation. Although this approach works well for dry non-adhesive particles,
it has been shown that for fine particles with adhesion, system behaviors are
drastically sensiti... | 1805.03025v2 |
2019-01-13 | Stochastic resonance and bifurcation of order parameter in a coupled system of underdamped Duffing oscillators | The long-term mean-field dynamics of coupled underdamped Duffing oscillators
driven by an external periodic signal with Gaussian noise is investigated. A
Boltzmann-type H-theorem is proved for the associated nonlinear Fokker-Planck
equation to ensure that the system can always be relaxed to one of the
stationary states... | 1901.03955v2 |
2019-03-19 | Conservative Discontinuous Galerkin Schemes for Nonlinear Fokker-Planck Collision Operators | We present a novel discontinuous Galerkin algorithm for the solution of a
class of Fokker-Planck collision operators. These operators arise in many
fields of physics, and our particular application is for kinetic plasma
simulations. In particular, we focus on an operator often known as the
`Lenard-Bernstein,' or `Dough... | 1903.08062v1 |
2019-03-20 | Limits of flexural wave absorption by open lossy resonators: reflection and transmission problems | The limits of flexural wave absorption by open lossy resonators are
analytically and numerically reported in this work for both the reflection and
transmission problems. An experimental validation for the reflection problem is
presented. The reflection and transmission of flexural waves in 1D resonant
thin beams are an... | 1903.08522v1 |
2019-04-18 | Emergence of hydrodynamical behavior in expanding quark-gluon plasmas | We use a set of simple angular moments to solve the Boltzmann equation in the
relaxation time approximation for a boost invariant longitudinally expanding
gluonic plasma. The transition from the free streaming regime at early time to
the hydrodynamic regime at late time is well captured by the first two-moments,
corres... | 1904.08677v1 |
2019-04-29 | A nonlinear subgrid-scale model for large-eddy simulations of rotating turbulent flows | Rotating turbulent flows form a challenging test case for large-eddy
simulation (LES). We, therefore, propose and validate a new subgrid-scale (SGS)
model for such flows. The proposed SGS model consists of a dissipative eddy
viscosity term as well as a nondissipative term that is nonlinear in the
rate-of-strain and rat... | 1904.12748v1 |
2019-04-29 | Dynamics of scalar fields in an expanding/contracting cosmos at finite temperature | This paper extends the study of the quantum dissipative effects of a
cosmological scalar field by taking into account the cosmic expansion and
contraction. Cheung, Drewes, Kang and Kim calculated the effective action and
quantum dissipative effects of a cosmological scalar field. The analytic
expressions for the effect... | 1904.12941v2 |
2019-05-09 | Global Robustness vs. Local Vulnerabilities in Complex Synchronous Networks | In complex network-coupled dynamical systems, two questions of central
importance are how to identify the most vulnerable components and how to devise
a network making the overall system more robust to external perturbations. To
address these two questions, we investigate the response of complex networks of
coupled osc... | 1905.03582v1 |
2019-05-20 | Out of time ordered effective dynamics of a quartic oscillator | We study the dynamics of a quantum Brownian particle weakly coupled to a
thermal bath. Working in the Schwinger-Keldysh formalism, we develop an
effective action of the particle up to quartic terms. We demonstrate that this
quartic effective theory is dual to a stochastic dynamics governed by a
non-linear Langevin equa... | 1905.08307v6 |
2019-06-11 | Instability of flux flow and production of vortex-antivortex pairs by current-driven Josephson vortices in layered superconductors | We report numerical simulations of the nonlinear dynamics of Josephson
vortices driven by strong dc currents in layered superconductors. Dynamic
equations for interlayer phase differences in a stack of coupled
superconducting layers were solved to calculate a drag coefficient $\eta(J)$ of
the vortex as a function of th... | 1906.04783v1 |
2020-01-22 | Probing XY phase transitions in a Josephson junction array with tunable frustration | The seminal theoretical works of Berezinskii, Kosterlitz, and Thouless
presented a new paradigm for phase transitions in condensed matter that are
driven by topological excitations. These transitions have been extensively
studied in the context of two-dimensional XY models -- coupled compasses -- and
have generated int... | 2001.07877v2 |
2020-01-30 | Electrical spectroscopy of forward volume spin waves in perpendicularly magnetized materials | We study the potential of all-electrical inductive techniques for the
spectroscopy of propagating forward volume spin waves. We develop a
one-dimensional model to account for the electrical signature of spin-wave
reflection and transmission between inductive antennas and validate it with
experiments on a perpendicularl... | 2001.11483v1 |
2020-02-27 | Dipole polarizability of time-varying particles | Invariance under time translation (or stationarity) is probably one of the
most important assumptions made when investigating electromagnetic phenomena.
Breaking this assumption is expected to open up novel possibilities and result
in exceeding conventional limitations. However, to explore the field of
time-varying ele... | 2002.12297v3 |
2020-02-25 | The Casimir densities for a sphere in the Milne universe | The influence of a spherical boundary on the vacuum fluctuations of a massive
scalar field is investigated in background of $(D+1)$-dimensional Milne
universe, assuming that the field obeys Robin boundary condition on the sphere.
The normalized mode functions are derived for the regions inside and outside
the sphere an... | 2003.05372v2 |
2020-04-15 | On the cavity evolution and the Rayleigh--Plesset equation in superfluid helium | On the basis of the two-fluid hydrodynamics, an analogue of the famous
Rayleigh-Plesse equation for the dynamics of a spherical bubble in superfluid
helium is obtained. The mass flow velocity $v$ and the velocity of the normal
component $v_{n}$ were chosen as independent variables. Due to the two-fluid
nature of HeII, ... | 2004.06893v1 |
2020-05-30 | Spiral defect chaos in Rayleigh-Bénard convection: Asymptotic and numerical studies of azimuthal flows induced by rotating spirals | Rotating spiral patterns in Rayleigh-B\'enard convection are known to induce
azimuthal flows, which raises the question of how different neighboring spirals
interact with each other in spiral chaos, and the role of hydrodynamics in this
regime. Far from the core, we show that spiral rotations lead to an azimuthal
body ... | 2006.00147v1 |
2020-06-16 | Learning Rates as a Function of Batch Size: A Random Matrix Theory Approach to Neural Network Training | We study the effect of mini-batching on the loss landscape of deep neural
networks using spiked, field-dependent random matrix theory. We demonstrate
that the magnitude of the extremal values of the batch Hessian are larger than
those of the empirical Hessian. We also derive similar results for the
Generalised Gauss-Ne... | 2006.09092v6 |
2020-07-20 | Hydrodynamic and thermal characteristics of a freely-vibrating circular cylinder in mixed convection flow | The hydrodynamic and thermal characteristics of a freely-vibrating circular
cylinder in mixed convection flow are numerically investigated at low Reynolds
numbers. The numerical investigations are conducted for a range of parameters,
Ur = [2.0, 10], Pr = [0.7, 10] and Ri = [0.5, 2.0]. Whereas the Reynolds
number, the m... | 2007.10091v2 |
2020-07-29 | Delayed Rebounds in the Two-Ball Bounce Problem | In the classroom demonstration of a tennis ball dropped on top of a
basketball, the surprisingly high bounce of the tennis ball is typically
explained using momentum conservation for elastic collisions, with the
basketball-floor collision treated as independent from the collision between
the two balls. This textbook ex... | 2007.15005v2 |
2020-08-08 | Axial Gravitational Waves in Bianchi I Universe | In this paper, we have studied the propagation of axial gravitational waves
in Bianchi I universe using the Regge-Wheeler gauge. In this gauge, there are
only two non-zero components of $ h_{\mu\nu} $ in the case of axial waves:
$h_0(t,r)$ and $h_1(t,r)$. The field equations in absence of matter have been
derived both ... | 2008.04780v2 |
2020-11-13 | Hopf Bifurcation for General 1D Semilinear Wave Equations with Delay | We consider boundary value problems for 1D autonomous damped and delayed
semilinear wave equations of the type $$ \partial^2_t u(t,x)-
a(x,\lambda)^2\partial_x^2u(t,x)=
b(x,\lambda,u(t,x),u(t-\tau,x),\partial_tu(t,x),\partial_xu(t,x)), \; x \in
(0,1) $$ with smooth coefficient functions $a$ and $b$ such that
$a(x,\lamb... | 2011.06824v1 |
2020-12-01 | Digital Light Processing in a Hybrid Atomic Force Microscope: In situ, Nanoscale Characterization of the Printing Process | Stereolithography (SLA) and digital light processing (DLP) are powerful
additive manufacturing techniques that address a wide range of applications
including regenerative medicine, prototyping, and manufacturing. Unfortunately,
these printing processes introduce micrometer-scale anisotropic inhomogeneities
due to the r... | 2012.00496v1 |
2021-02-23 | Cosmic Ray Transport in the Ionized and Neutral ISM: MHD-PIC Simulations and Effective Fluid Treatments | Cosmic rays (CRs) have critical impacts in the multiphase interstellar medium
(ISM), driving dynamical motions in low-density plasma and modifying the
ionization state, temperature, and chemical composition of higher-density
atomic and molecular gas. We present a study of CR propagation between the
ionized ISM and a ne... | 2102.11877v1 |
2021-03-10 | Quasi-solid state microscopic dynamics in equilibrium classical liquids: Self-consisnent relaxation theory | In the framework of the concept of time correlation functions, we develop a
self-consistent relaxation theory of the transverse collective particle
dynamics in liquids. The theory agrees with well-known results in both the
short-wave (free particle dynamics) and the long-wave (hydrodynamic) limits. We
obtain a general ... | 2103.06241v1 |
2021-04-01 | Brownian motion under intermittent harmonic potentials | We study the effects of an intermittent harmonic potential of strength $\mu =
\mu_0 \nu$ -- that switches on and off stochastically at a constant rate
$\gamma$, on an overdamped Brownian particle with damping coefficient $\nu$.
This can be thought of as a realistic model for realisation of stochastic
resetting. We show... | 2104.00609v2 |
2021-04-29 | Resonant Chains of Exoplanets: Libration Centers for Three-body Angles | Resonant planetary systems contain at least one planet pair with orbital
periods librating at a near-integer ratio (2/1, 3/2, 4/3, etc.) and are a
natural outcome of standard planetary formation theories. Systems with multiple
adjacent resonant pairs are known as resonant chains and can exhibit three-body
resonances --... | 2104.14665v1 |
2021-04-30 | Complete modeling of hydrodynamic bearings with a boundary parameterization approach | The present work aims to revisit the simplifications made in the
Navier-Stokes equations for the flow between two cylinders with a small
thickness of lubricating oil film. Through a dimensionless analysis, the terms
of these equations are mapped and ordered by importance for the hydrodynamic
bearing application. An eff... | 2105.00118v3 |
2021-07-27 | Performance-based optimal distribution of viscous dampers in structure using hysteretic energy compatible endurance time excitations | Performance-based optimization of energy dissipation devices in structures
necessitates massive and repetitive dynamic analyses. In the endurance time
method known as a rather fast dynamic analysis procedure, structures are
subjected to intensifying dynamic excitations and their response at multiple
intensity levels is... | 2107.12983v1 |
2021-08-18 | Velocity auto correlation function of a confined Brownian particle | Motivated by the simple models of molecular motor obeying a linear
force-velocity relation, we have studied the stochastic dynamics of a Brownian
particle in the presence of a linear velocity dependent force,
$f_s(1-\frac{v}{v_0})$ where $f_{s}$ is a constant. The position and velocity
auto correlation functions in dif... | 2108.07922v1 |
2021-10-08 | Relationship between low-discrepancy sequence and static solution to multi-bodies problem | The main interest of this paper is to study the relationship between the
low-discrepancy sequence and the static solution to the multi-bodies problem in
high-dimensional space. An assumption that the static solution to the
multi-bodies problem is a low-discrepancy sequence is proposed. Considering the
static solution t... | 2110.03918v1 |
2021-12-08 | Resolving Hall and dissipative viscosity ambiguities via boundary effects | We examine the physical implications of the viscous redundancy of
two-dimensional anisotropic fluids, where different components of the viscosity
tensor lead to identical effects in the bulk of a system [Rao and Bradlyn,
Phys. Rev. X $\textbf{10}$, 021005 (2020)]. We first re-introduce the
redundancy, show how it refle... | 2112.04545v2 |
2021-12-25 | Transport and modeling of subgrid-scale turbulent kinetic energy in channel flows | To develop a more convenient subgrid-scale (SGS) model that performs well
even in coarse grid cases, we investigate the transport and modeling of SGS
turbulent kinetic energy (hereafter SGS energy) in turbulent channel flows
based on the stabilized mixed model (SMM). In this paper, we try to increase
the convenience of... | 2112.13200v3 |
2022-01-08 | Local Gyrokinetic Collisional Theory of the Ion-Temperature Gradient Mode | We present a study of the linear properties of ion temperature gradient (ITG)
modes with collisions modelled by the linearized gyrokinetic (GK) Coulomb
collision operator (Frei et al. 2021) in the local limit. The study is based on
a Hermite-Laguerre polynomial expansion of the perturbed ion distribution
function appli... | 2201.02860v2 |
2022-02-11 | Cosmic-ray generated bubbles around their sources | Cosmic rays are thought to escape their sources streaming along the local
magnetic field lines. We show that this phenomenon generally leads to the
excitation of both resonant and non-resonant streaming instabilities. The
self-generated magnetic fluctuations induce particle diffusion in extended
regions around the sour... | 2202.05814v1 |
2022-02-22 | Criterion of Bari basis property for $2 \times 2$ Dirac-type operators with strictly regular boundary conditions | The paper is concerned with the Bari basis property of a boundary value
problem associated in $L^2([0,1]; \mathbb{C}^2)$ with the following $2 \times
2$ Dirac-type equation for $y = {\rm col}(y_1, y_2)$: $$L_U(Q) y =-i B^{-1} y'
+ Q(x) y = \lambda y , \quad B = \begin{pmatrix} b_1 & 0 \\ 0 & b_2
\end{pmatrix}, \quad b_... | 2202.11148v1 |
2022-03-22 | Hydromagnetic waves in an expanding universe -- cosmological MHD code tests using analytic solutions | We describe how analytic solutions for linear hydromagnetic waves can be used
for testing cosmological magnetohydrodynamic (MHD) codes. We start from the
comoving MHD equations and derive analytic solutions for the amplitude
evolution of linear hydromagnetic waves in a matter-dominated, flat
Einstein-de-Sitter (EdS) un... | 2203.11887v2 |
2022-03-22 | Cosmic-Ray Transport in Varying Galactic Environments | We study the propagation of mildly-relativistic cosmic rays (CRs) in
multiphase interstellar medium environments with conditions typical of nearby
disk galaxies. We employ the techniques developed in Armillotta+21 to
post-process three high-resolution TIGRESS magnetohydrodynamic simulations
modeling local patches of st... | 2203.11949v1 |
2022-05-23 | Universal mechanical response of metallic glasses during strain-rate-dependent uniaxial compression | Experimental data on the compressive strength $\sigma_{\rm max}$ versus
strain rate ${\dot \varepsilon}_{\rm eng}$ for metallic glasses undergoing
uniaxial compression shows significantly different behavior for different
alloys. For some metallic glasses, $\sigma_{\rm max}$ decreases with increasing
${\dot \varepsilon}... | 2205.11340v1 |
2022-05-29 | Negative cavity photon spectral function in an optomechanical system with two parametrically-driven mechanical modes | We propose an experimentally feasible optomechanical scheme to realize a
negative cavity photon spectral function (CPSF) which is equivalent to a
negative absorption. The system under consideration is an optomechanical system
consisting of two mechanical (phononic) modes which are linearly coupled to a
common cavity mo... | 2205.15314v3 |
2022-06-27 | Diffusion in the Presence of Correlated Returns in a Two-dimensional Energy Landscape and non-Monotonic Friction Dependence: Examination of Simulation Results by a Random Walk Model | Diffusion in a multidimensional energy surface with minima and barriers is a
problem of importance in statistical mechanics and also has wide applications,
such as protein folding. To understand it in such a system, we carry out theory
and simulations of a tagged particle moving on a two-dimensional periodic
potential ... | 2206.13565v1 |
2022-07-14 | The Damped Wave Equation with Acoustic Boundary Conditions and Non-locally Reacting Surfaces | The aim of the paper is to study the problem $$u_{tt}+du_t-c^2\Delta u=0
\qquad \text{in $\mathbb{R}\times\Omega$,}$$ $$\mu v_{tt}- \text{div}_\Gamma
(\sigma \nabla_\Gamma v)+\delta v_t+\kappa v+\rho u_t =0\qquad \text{on
$\mathbb{R}\times \Gamma_1$,}$$ $$v_t =\partial_\nu u\qquad \text{on
$\mathbb{R}\times \Gamma_1$,}... | 2207.07047v2 |
2022-08-01 | Stochastic Galerkin particle methods for kinetic equations of plasmas with uncertainties | The study of uncertainty propagation is of fundamental importance in plasma
physics simulations. To this end, in the present work we propose a novel
stochastic Galerkin (sG) particle {method} for collisional kinetic models of
plasmas under the effect of uncertainties. This class of methods is based on a
generalized pol... | 2208.00692v2 |
2022-08-02 | Diagrammatic perturbation theory for Stochastic nonlinear oscillators | We consider the stochastically driven one dimensional nonlinear oscillator
$\ddot{x}+2\Gamma\dot{x}+\omega^2_0 x+\lambda x^3 = f(t)$ where f(t) is a
Gaussian noise which, for the bulk of the work, is delta correlated (white
noise). We construct the linear response function in frequency space in a
systematic Feynman dia... | 2208.01349v2 |
2022-08-09 | Pulsar radio emission mechanism II. On the origin of relativistic Langmuir solitons in pulsar plasma | Observations suggest that coherent radio emission from pulsars is excited in
a dense pulsar plasma by curvature radiation from charge bunches. Numerous
studies propose that these charge bunches are relativistic charge solitons
which are solutions of the non-linear Schr\"{o}dinger equation (NLSE) with a
group velocity d... | 2208.04894v1 |
2022-08-24 | Analysis of point-contact models of the bounce of a hard spinning ball on a compliant frictional surface | Inspired by the turf-ball interaction in golf, this paper seeks to understand
the bounce of a ball that can be modelled as a rigid sphere and the surface as
supplying an elasto-plastic contact force in addition to Coulomb friction. A
general formulation is proposed that models the finite time interval of bounce
from to... | 2208.11685v1 |
2022-08-31 | Reynolds number effects on the bistable flows over a wavy circular cylinder | The wake of wavy cylinder has been shown to exhibit bistability. Depending on
the initial condition, the final state of the wake can either develop into a
steady flow (state I), or periodic shedding (state II). In this paper, we
perform direct numerical simulations to reveal the Reynolds number effects on
these two wak... | 2208.14606v1 |
2022-09-13 | Do Periods of Decayless Kink Oscillations of Solar Coronal Loops Depend on Noise? | Decayless kink oscillations of solar coronal loops are studied in terms of a
low-dimensional model based on a randomly driven Rayleigh oscillator with
coefficients experiencing random fluctuations. The model considers kink
oscillations as natural modes of coronal loops, decaying by linear resonant
absorption. The dampi... | 2209.06343v1 |
2022-10-11 | Switching Dynamics of Shallow Arches | This paper presents an analytical method to predict the delayed switching
dynamics of nonlinear shallow arches while switching from one state to another
state for different loading cases. We study an elastic arch subject to static
loading and time-dependent loading separately. In particular, we consider a
time-dependen... | 2210.05734v2 |
2022-10-11 | Moment-Based Approach to the Flux-Tube linear Gyrokinetic Model | This work reports on the development and numerical implementation of the
linear electromagnetic gyrokinetic (GK) model in a tokamak flux-tube geometry
using a moment approach based on the expansion of the perturbed distribution
function on a velocity-space Hermite-Laguerre polynomials basis. A hierarchy of
equations of... | 2210.05799v1 |
2022-10-17 | Pion dynamics in a soft-wall AdS-QCD model | Pseudo-Goldstone modes appear in many physical systems and display robust
universal features. First, their mass $m$ obeys the so-called
Gell-Mann-Oakes-Renner (GMOR) relation $f^2\,m^2=H\,\bar{\sigma}$, with $f$ the
Goldstone stiffness, $H$ the explicit breaking scale and $\bar{\sigma}$ the
spontaneous condensate. More... | 2210.09088v1 |
2022-11-03 | Viscous attenuation of gravitational waves propagating through an inhomogeneous background | We consider the propagation of gravitational waves in the late-time Universe
in the presence of matter distribution inhomogeneities, and we also consider
the cosmic fluid to be viscous. In this work, we investigate the cumulative
effect of inhomogeneities and viscosity of the cosmic-fluid on the observables
associated ... | 2211.01652v3 |
2022-11-07 | Three-Dimensionality in the flow of an elastically mounted circular cylinder with two-degree-of-freedom vortex-induced-vibrations | The study numerically investigates the three-dimensionality in the flow and
two-degree-of-freedom (2 DOF) vortex-induced-vibrations (VIV) characteristics
of an elastically mounted circular cylinder. The cylinder is allowed to vibrate
in both streamwise and transverse directions. A low value of mass-ratio with
the zero ... | 2211.03307v1 |
2022-11-10 | Nonreciprocal nanoparticle refrigerators: design principles and constraints | We study the heat transfer between two nanoparticles held at different
temperatures that interact through nonreciprocal forces, by combining molecular
dynamics simulations with stochastic thermodynamics. Our simulations reveal
that it is possible to construct nano refrigerators that generate a net heat
transfer from a ... | 2211.05502v3 |
2022-11-11 | Chemical Mixing Induced by Internal Gravity Waves in Intermediate Mass Stars | Internal gravity waves (IGWs) can cause mixing in the radiative interiors of
stars. We study this mixing by introducing tracer particles into two -
dimensional (2D) hydrodynamic simulations. Following the work of Rogers &
McElwaine (2017), arXiv:1709.04920, we extend our study to different masses (3
M$_{\odot}$, 7 M$_{... | 2211.06432v1 |
2023-06-20 | A revised gap-averaged Floquet analysis of Faraday waves in Hele-Shaw cells | Existing theoretical analyses of Faraday waves in Hele-Shaw cells rely on the
Darcy approximation and assume a parabolic flow profile in the narrow
direction. However, Darcy's model is known to be inaccurate when convective or
unsteady inertial effects are important. In this work, we propose a
gap-averaged Floquet theo... | 2306.11501v1 |
2023-07-04 | Exponential stability of Euler-Bernoulli beam under boundary controls in rotation and angular velocity | This paper addresses the analysis of a boundary feedback system involving a
non-homogeneous Euler-Bernoulli beam governed by the equation
$m(x)u_{tt}+\mu(x)u_{t}$$+\left(r(x)u_{xx}\right)_{xx}=0$, subject to the
initial $u(x,0)=u_0(x)$, $u_t(x,0)=v_0(x)$ and boundary conditions $u(0,t)=0$,
$\left (-r(x)u_{xx}(x,t)\righ... | 2307.01518v1 |
2023-07-10 | Full-F Turbulent Simulation in a Linear Device using a Gyro-Moment Approach | Simulations of plasma turbulence in a linear plasma device configuration are
presented. These simulations are based on a simplified version of the
gyrokinetic (GK) model proposed by B. J. Frei et al. [J. Plasma Phys. 86,
905860205 (2020)] where the full-F distribution function is expanded on a
velocity-space polynomial... | 2307.04562v2 |
2023-07-12 | Robust scalable initialization for Bayesian variational inference with multi-modal Laplace approximations | For predictive modeling relying on Bayesian inversion, fully independent, or
``mean-field'', Gaussian distributions are often used as approximate
probability density functions in variational inference since the number of
variational parameters is twice the number of unknown model parameters. The
resulting diagonal cova... | 2307.06424v1 |
2023-09-26 | Universal Pairwise Interatomic van der Waals Potentials Based on Quantum Drude Oscillators | Repulsive short-range and attractive long-range van der Waals (vdW) forces
have an appreciable role in the behavior of extended molecular systems. When
using empirical force fields - the most popular computational methods applied
to such systems - vdW forces are typically described by Lennard-Jones-like
potentials, whi... | 2309.14910v1 |
2023-10-18 | Quartic scaling of sound attenuation with frequency in vitreous silica | Several theoretical approaches to disordered media predict that acoustic
waves should undergo a quartic increase in their attenuation coefficient with
increasing frequency in the sub-terahertz region. Such Rayleigh-type scattering
would be related to the anomalous low-temperature plateau in the thermal
conductivity and... | 2310.11832v1 |
2023-11-11 | Effects of wave parameters on load reduction performance for amphibious aircraft with V-hydrofoil | An investigation of the influence of the hydrofoil on load reduction
performance during an amphibious aircraft landing on still and wavy water is
conducted by solving the Unsteady Reynolds-Averaged Navier-Stokes equations
coupled with the standard $k-\omega$ turbulence model in this paper. During the
simulations, the n... | 2311.06516v1 |
2023-11-17 | Simulating X-ray Reverberation in the UV-Emitting Regions of Active Galactic Nuclei Accretion Disks with 3D Multi-Frequency Magnetohydrodynamic Simulations | Active galactic nuclei (AGN) light curves observed with different wavebands
show that the variability in longer wavelength bands lags the variability in
shorter wavelength bands. Measuring these lags, or reverberation mapping, is
used to measure the radial temperature profile and extent of AGN disks,
typically with a r... | 2311.10820v1 |
2023-11-25 | Ultrasensitive vibrational resonance induced by small disturbances | We have found two kinds of ultra-sensitive vibrational resonance in coupled
nonlinear systems. It is particularly worth pointing out that this
ultra-sensitive vibrational resonance is a transient behavior caused by
transient chaos. Considering long-term response, the system will transform from
transient chaos to period... | 2312.11474v1 |
2024-02-13 | Hyperballistic transport in dense ionized matter under external AC electric fields | The Langevin equation is ubiquitously employed to numerically simulate
plasmas and dusty plasmas. However, the usual assumption of white noise becomes
untenable when the system is subject to an external AC electric field. This is
because the charged particles in the plasma, which provide the thermal bath for
the partic... | 2402.08519v2 |
2024-02-15 | Tracer dynamics in polymer networks: generalized Langevin description | Tracer diffusion in polymer networks and hydrogels is relevant in biology and
technology, while it also constitutes an interesting model process for the
dynamics of molecules in fluctuating, heterogeneous soft matter. Here, we study
systematically the time-dependent dynamics and (non-Markovian) memory effects
of tracer... | 2402.10148v1 |
2024-02-21 | Obstacle crossing strategies for high-speed 4WD small-scale vehicle | Unmanned ground vehicle obstacle crossing generally relies on two strategies:
(i) applying a wheel torque for climbing and (ii) modifying the vehicle shape
by using a wheel-leg or wheel-paddle to lift the wheel on top of the obstacle.
However, most of those strategies sacrifice speed in order to have a longer
contact d... | 2402.13650v1 |
2001-08-02 | Dielectronic Recombination (via N=2 --> N'=2 Core Excitations) and Radiative Recombination of Fe XX: Laboratory Measurements and Theoretical Calculations | We have measured the resonance strengths and energies for dielectronic
recombination (DR) of Fe XX forming Fe XIX via N=2 --> N'=2 (Delta_N=0) core
excitations. We have also calculated the DR resonance strengths and energies
using AUTOSTRUCTURE, HULLAC, MCDF, and R-matrix methods, four different
state-of-the-art theore... | 0108048v1 |
2003-10-21 | Self-Consistent R-matrix Approach To Photoionization And Unified Electron-Ion Recombination | A unified scheme using the R-matrix method has been developed for
electron-ion recombination subsuming heretofore separate treatments of
radiative and dielectronic recombination (RR and DR). The ab initio coupled
channel approach unifies resonant and non-resonant phenomena, and enables a
general and self-consistent tre... | 0310624v1 |
2001-10-19 | A Survey of Numerical Solutions to the Coagulation Equation | We present the results of a systematic survey of numerical solutions to the
coagulation equation for a rate coefficient of the form A_ij \propto (i^mu j^nu
+ i^nu j^mu) and monodisperse initial conditions. The results confirm that
there are three classes of rate coefficients with qualitatively different
solutions. For ... | 0110411v1 |
2003-11-08 | Memory effects in superfluid vortex dynamics | The dissipative dynamics of a vortex line in a superfluid is investigated
within the frame of a non-Markovian quantal Brownian motion model. Our starting
point is a recently proposed interaction Hamiltonian between the vortex and the
superfluid quasiparticle excitations, which is generalized to incorporate the
effect o... | 0311179v3 |
2015-09-03 | Evidence of thermal conduction suppression in a solar flaring loop by coronal seismology of slow-mode waves | Analysis of a longitudinal wave event observed by the Atmospheric Imaging
Assembly (AIA) onboard the Solar Dynamics Observatory (SDO) is presented. A
time sequence of 131 A images reveals that a C-class flare occurred at one
footpoint of a large loop and triggered an intensity disturbance (enhancement)
propagating alon... | 1509.00920v2 |
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