publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2014-02-20 | Starobinsky-Like Inflation in Dilaton-Brane Cosmology | We discuss how Starobinsky-like inflation may emerge from dilaton dynamics in
brane cosmology scenarios based on string theory, in which our universe is
represented as a three-brane. The effective potential may acquire a constant
term from a density of effectively point-like non-pertubative defects on the
brane. Higher... | 1402.5075v2 |
2014-02-24 | Universal High Order Subroutine with New Shock Detector for Shock Boundary Layer Interaction | The goal of this work is to develop a new universal high order subroutine for
shock boundary layer interaction. First, an effective shock/discontinuity
detector has been developed.The detector has two steps.The first step is to
check the ratio of the truncation errors on the coarse and fine grids and the
second step is... | 1402.5885v1 |
2014-03-25 | Fluctuation-dissipation relations for a plasma-kinetic Langevin equation | A linearised kinetic equation describing electrostatic perturbations of a
Maxwellian equilibrium in a weakly collisional plasma forced by a random source
is considered. The problem is treated as a kinetic analogue of the Langevin
equation and the corresponding fluctuation-dissipation theorem is derived. This
kinetic fl... | 1403.6257v3 |
2014-05-29 | Dynamical spin response in cuprate superconductors from low-energy to high-energy | Within the framework of the kinetic energy driven superconducting mechanism,
the dynamical spin response of cuprate superconductors is studied from
low-energy to high-energy. The spin self-energy is evaluated explicitly in
terms of the collective charge carrier modes in the particle-hole and
particle-particle channels,... | 1405.7448v2 |
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 |
2014-08-29 | Thermal pairing and giant dipole resonance in highly excited nuclei | Recent results are reported showing the effects of thermal pairing in highly
excited nuclei. It is demonstrated that thermal pairing included in the phonon
damping model (PDM) is responsible for the nearly constant width of the giant
dipole resonance (GDR) at low temperature $T <$ 1 MeV. It is also shown that
the enhan... | 1408.6905v1 |
2014-12-23 | Classical Noether's theory with application to the linearly damped particle | This paper provides a modern presentation of Noether's theory in the realm of
classical dynamics, with application to the problem of a particle submitted to
both a potential and a linear dissipation. After a review of the close
relationships between Noether symmetries and first integrals, we investigate
the variational... | 1412.7523v2 |
2015-01-12 | A New Fate of a Warped 5D FRW Model with a U(1) Scalar Gauge Field | If we live on the weak brane with zero effective cosmological constant in a
warped 5D bulk spacetime, gravitational waves and brane fluctuations can be
generated by a part of the 5D Weyl tensor and carries information of the
gravitational field outside the brane. We consider on a cylindrical symmetric
warped FRW backgr... | 1501.02843v5 |
2015-03-01 | Generalized spectral method for near-field optical microscopy | Electromagnetic interaction between a sub-wavelength particle (the `probe')
and a material surface (the `sample') is studied theoretically. The interaction
is shown to be governed by a series of resonances corresponding to surface
polariton modes localized near the probe. The resonance parameters depend on
the dielectr... | 1503.00221v2 |
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 |
2015-04-29 | Stability of rings around a triaxial primary | Generally, the oblateness of a planet or moon is what causes rings to settle
into its equatorial plane. However, the recent suggestion that a ring system
might exist (or have existed) about Rhea, a moon whose shape includes a strong
prolate component pointed toward Saturn, raises the question of whether rings
around a ... | 1504.07807v1 |
2015-05-06 | Application of optimal homotopy asymptotic method to nonlinear Bingham fluid dampers | Magnetorheological fluids (MR) are stable suspensions of magnetizable
microparticles, characterized by the property to change the rheological
characteristics when subjected to the action of magnetic field. Together with
another class of materials that change their rheological characteristics in the
presence of an elect... | 1505.01322v1 |
2015-06-28 | Slimplectic Integrators: Variational Integrators for General Nonconservative Systems | Symplectic integrators are widely used for long-term integration of
conservative astrophysical problems due to their ability to preserve the
constants of motion; however, they cannot in general be applied in the presence
of nonconservative interactions. In this Letter, we develop the "slimplectic"
integrator, a new typ... | 1506.08443v3 |
2015-09-28 | Breaking a Dark Degeneracy with Gravitational Waves | We identify a scalar-tensor model embedded in the Horndeski action whose
cosmological background and linear scalar fluctuations are degenerate with the
concordance cosmology. The model admits a self-accelerated background expansion
at late times that is stable against perturbations with a sound speed
attributed to the ... | 1509.08458v2 |
2015-12-02 | Thermodynamics of the heat currents in the longitudinal spin Seebeck and spin Peltier effects | We employ the non-equilibrium thermodynamics of currents and forces to
describe the heat transport caused by a spin current in a Pt/YIG bilayer. By
starting from the constitutive equations of the magnetization currents in both
Pt and YIG, we derive the magnetization potentials and currents. We apply the
theory to the s... | 1512.00644v2 |
2015-12-11 | Infrared study of lattice dynamics and spin-phonon and electron-phonon interactions in multiferroic TbFe3(BO3)4 and GdFe3(BO3)4 | We present a comparative far-infrared reflection spectroscopy study of
phonons, phase transitions, spin-phonon and electron-phonon interactions in
isostructural multiferroic iron borates of gadolinium and terbium. The behavior
of phonon modes registered in a wide temperature range is consistent with a
weak first-order ... | 1512.03527v1 |
2015-12-27 | Electrically Switchable Metadevices via Graphene | Metamaterials bring sub-wavelength resonating structures together to overcome
the limitations of conventional materials. The realization of active
metadevices has been an outstanding challenge that requires electrically
reconfigurable components operating over a broad spectrum with a wide dynamic
range. The existing ca... | 1512.08277v3 |
2016-02-03 | Extending the velocity-dependent one-scale model for domain walls | We report on an extensive study of the evolution of domain wall networks in
Friedmann-Lema\^{\i}tre-Robertson-Walker universes by means of the largest
currently available field-theory simulations. These simulations were done in
$4096^3$ boxes and for a range of different fixed expansion rates, as well as
for the transi... | 1602.01322v2 |
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 |
2016-04-18 | Anisotropic magnetization relaxation in ferromagnetic multilayers with variable interlayer exchange coupling | The FMR linewidth and its anisotropy in F$_1$/f/F$_2$/AF multilayers, where
spacer f has a low Curie point compared to the strongly ferromagnetic F$_1$ and
F$_2$, is investigated. The role of the interlayer exchange coupling in
magnetization relaxation is determined experimentally by varying the thickness
of the spacer... | 1604.05145v1 |
2016-05-04 | Athermal rheology of weakly attractive soft particles | We study the rheology of a soft particulate system where the inter-particle
interactions are weakly attractive. Using extensive molecular dynamics
simulations, we scan across a wide range of packing fractions ($\phi$),
attraction strengths ($u$) and imposed shear-rates ($\dot{\gamma}$). In
striking contrast to repulsiv... | 1605.01222v4 |
2016-05-05 | Fractional Brownian motion, the Matern process, and stochastic modeling of turbulent dispersion | Stochastic process exhibiting power-law slopes in the frequency domain are
frequently well modeled by fractional Brownian motion (fBm). In particular, the
spectral slope at high frequencies is associated with the degree of small-scale
roughness or fractal dimension. However, a broad class of real-world signals
have a h... | 1605.01684v3 |
2016-06-16 | Calculating rotating hydrodynamic and magneto-hydrodynamic waves to understand magnetic effects on dynamical tides | For understanding magnetic effects on dynamical tides, we study the rotating
magneto-hydrodynamic (MHD) flow driven by harmonic forcing. The linear
responses are analytically derived in a periodic box under the local WKB
approximation. Both the kinetic and Ohmic dissipations at the resonant
frequencies are calculated a... | 1606.06232v1 |
2016-08-07 | Two-loop RGE of a general renormalizable Yang-Mills theory in a renormalization scheme with an explicit UV cutoff | We perform a systematic one-loop renormalization of a general renormalizable
Yang-Mills theory coupled to scalars and fermions using a regularization scheme
with a smooth momentum cutoff $\Lambda$ (implemented through an exponential
damping factor). We construct the necessary finite counterterms restoring the
BRST inva... | 1608.02270v3 |
2016-10-11 | On the free-precession candidate PSR B1828-11: Evidence for increasing deformation | We observe that the periodic variations in spin-down rate and beam-width of
the radio pulsar PSR B1828-11 are getting faster. In the context of a free
precession model, this corresponds to a decrease in the precession period
$P_{\mathrm{fp}}$. We investigate how a precession model can account for such a
decrease in $P_... | 1610.03508v3 |
2016-10-24 | Low-power photothermal self-oscillation of bimetallic nanowires | We investigate the nonlinear mechanics of a bimetallic, optically absorbing
SiN-Nb nanowire in the presence of incident laser light and a reflecting Si
mirror. Situated in a standing wave of optical intensity and subject to
photothermal forces, the nanowire undergoes self-induced oscillations at low
incident light thre... | 1610.07591v4 |
2016-11-21 | Relativistic orbits around spinning supermassive black holes. Secular evolution to 4.5 post-Newtonian order | We derive the secular evolution of the orbital elements of a stellar-mass
object orbiting a spinning massive black hole. We use the post-Newtonian
approximation in harmonic coordinates, with test-body equations of motion for
the conservative dynamics that are valid through 3PN order, including
spin-orbit, quadrupole an... | 1611.06931v1 |
2016-12-01 | Echoes from the Abyss: Tentative evidence for Planck-scale structure at black hole horizons | In classical General Relativity (GR), an observer falling into an
astrophysical black hole is not expected to experience anything dramatic as she
crosses the event horizon. However, tentative resolutions to problems in
quantum gravity, such as the cosmological constant problem, or the black hole
information paradox, in... | 1612.00266v2 |
2016-12-21 | Cosmological singularity resolution from quantum gravity: the emergent-bouncing universe | Alternative scenarios to the Big Bang singularity have been subject of
intense research for several decades by now. Most popular in this sense have
been frameworks were such singularity is replaced by a bounce around some
minimal cosmological volume or by some early quantum phase. This latter
scenario was devised a lon... | 1612.07116v2 |
2017-01-12 | Dynamic coupling of ferromagnets via spin Hall magnetoresistance | The synchronized magnetization dynamics in ferromagnets on a nonmagnetic
heavy metal caused by the spin Hall effect is investigated theoretically. The
direct and inverse spin Hall effects near the ferromagnetic/nonmagnetic
interface generate longitudinal and transverse electric currents. The
phenomenon is known as the ... | 1701.03201v2 |
2017-02-09 | Damped spin excitations in a doped cuprate superconductor with orbital hybridization | A resonant inelastic x-ray scattering (RIXS) study of overdamped
spin-excitations in slightly underdoped La$_{2-x}$Sr$_{x}$CuO$_4$ (LSCO) with
$x=0.12$ and $0.145$ is presented. Three high-symmetry directions have been
investigated: (1) the antinodal $(0,0)\rightarrow (1/2,0)$, (2) the nodal
$(0,0)\rightarrow (1/4,1/4)... | 1702.02782v3 |
2017-02-24 | Dicke Phase Transition and Collapse of Superradiant Phase in Optomechanical Cavity with Arbitrary Number of Atoms | We in this paper derive the analytical expressions of ground-state energy,
average photon-number, and the atomic population by means of the
spin-coherent-state variational method for arbitrary number of atoms in an
optomechanical cavity. It is found that the existence of mechanical oscil-
lator does not affect the phas... | 1702.07438v1 |
2017-02-28 | Photon-Axion Conversion, Magnetic Field Configuration, and Polarization of Photons | We study the evolution of photon polarization during the photon-axion
conversion process with focusing on the magnetic field configuration
dependence. Most previous studies have been carried out in a conventional model
where a network of magnetic domains is considered and each domain has a
constant magnetic field. We i... | 1702.08843v2 |
2017-03-17 | Quasinormal modes of a scalar field in the Einstein--Gauss--Bonnet-AdS black hole background: Perturbative and non-perturbative branches | It has recently been found that quasinormal modes of asymptotically anti-de
Sitter (AdS) black holes in theories with higher curvature corrections may help
to describe the regime of intermediate 't Hooft coupling in the dual field
theory. Here, we consider quasinormal modes of a scalar field in the background
of spheri... | 1703.06215v3 |
2017-05-19 | A Superior but Equally Convenient Alternative to the Steady-State Approximation and Secular Equilibrium | The steady-state approximation (hereafter abbreviated as SSA) consists in
setting $dy/dt=0$, where $y$ denotes the concentration of a short-lived
intermediate subject to first-order decay with a rate constant $k$. The sole
reason for enforcing SSA is to convert the rate equation for $y$ into an
algebraic equation. The ... | 1705.08749v2 |
2017-06-21 | Spectral analysis and multigrid preconditioners for two-dimensional space-fractional diffusion equations | Fractional diffusion equations (FDEs) are a mathematical tool used for
describing some special diffusion phenomena arising in many different
applications like porous media and computational finance. In this paper, we
focus on a two-dimensional space-FDE problem discretized by means of a second
order finite difference s... | 1706.06844v1 |
2017-07-07 | Interplay between the edge-state magnetism and long-range Coulomb interaction in zigzag graphene nanoribbons: quantum Monte Carlo study | We perform projective quantum Monte Carlo simulations of zigzag graphene
nanoribbons within a realistic model with long-range Coulomb interactions.
Increasing the relative strength of nonlocal interactions with respect to the
on-site repulsion does not generate a phase transition but has a number of
nontrivial effects.... | 1707.02065v2 |
2017-09-30 | Tuning the diffusion of magnon in Y3Fe5O12 by light excitation | Deliberate control of magnon transportation will lead to an energy-efficient
technology for information transmission and processing. Y3Fe5O12(YIG),
exhibiting extremely large magnon diffusion length due to the low magnetic
damping constant, has been intensively investigated for decades. While most of
the previous works... | 1710.00222v2 |
2017-10-19 | Global performance metrics for synchronization of heterogeneously rated power systems: The role of machine models and inertia | A recent trend in control of power systems has sought to quantify the
synchronization dynamics in terms of a global performance metric, compute it
under very simplified assumptions, and use it to gain insight on the role of
system parameters, in particular, inertia. In this paper, we wish to extend
this approach to mor... | 1710.07195v4 |
2017-12-20 | Second-harmonic magnetic response characterizing magnetite-based colloid | Nonlinear second-harmonic magnetic response (M2) was used to characterize an
aqueous colloidal solution of dextran-coated magnetite (Fe3O4) nanoparticles.
Data analysis with the formalism based on Gilbert-Landau-Lifshitz equation for
stochastic dynamics of superparamagnetic (SP) particles ensured extensive
quantifying ... | 1712.07534v1 |
2018-02-09 | Monocrystalline free standing 3D yttrium iron garnet magnon nano resonators | Nano resonators in which mechanical vibrations and spin waves can be coupled
are an intriguing concept that can be used in quantum information processing to
transfer information between different states of excitation. Until now, the
fabrication of free standing magnetic nanostructures which host long lived spin
wave ex... | 1802.03176v2 |
2018-03-07 | Rapidly forming, slowly evolving, spatial patterns from quasi-cycle Mexican Hat coupling | A lattice-indexed family of stochastic processes has quasi-cycle oscillations
if its otherwise-damped oscillations are sustained by noise. Such a family
performs the reaction part of a discrete stochastic reaction-diffusion system
when we insert a local Mexican Hat-type, difference of Gaussians, coupling on a
one-dimen... | 1803.02917v2 |
2018-03-23 | Observation of hedgehog skyrmions in sub-100 nm soft magnetic nanodots | Magnetic skyrmions are nanometric spin textures of outstanding potential for
spintronic applications due to unique features governed by their non-trivial
topology. It is well known that skyrmions of definite chirality are stabilized
by the Dzyaloshinskii-Moriya exchange interaction (DMI) in bulk
non-centrosimmetric mat... | 1803.08768v1 |
2018-05-08 | Fitting a function to time-dependent ensemble averaged data | Time-dependent ensemble averages, i.e., trajectory-based averages of some
observable, are of importance in many fields of science. A crucial objective
when interpreting such data is to fit these averages (for instance, squared
displacements) with a function and extract parameters (such as diffusion
constants). A common... | 1805.03057v1 |
2018-05-22 | Time dilation in the oscillating decay laws of moving two-mass unstable quantum states | The decay of a moving system is studied in case the system is initially
prepared in a two-mass unstable quantum state. The survival probability
$\mathcal{P}_p(t)$ is evaluated over short and long times in the reference
frame where the unstable system moves with constant linear momentum $p$. The
mass distribution densit... | 1805.08335v1 |
2018-05-23 | The classical D-type expansion of spherical H II regions | Recent numerical and analytic work has highlighted some shortcomings in our
understanding of the dynamics of H II region expansion, especially at late
times, when the H II region approaches pressure equilibrium with the ambient
medium. Here we reconsider the idealized case of a constant radiation source in
a uniform an... | 1805.09273v1 |
2018-05-24 | Quantum surface diffusion in Bohmian Mechanics | Surface diffusion of small adsorbates is analyzed in terms of the so-called
intermediate scattering function and dynamic structure factor, observables in
experiments using the well-known quasielastic Helium atom scattering and Helium
spin echo techniques. The linear theory used is an extension of the neutron
scattering... | 1805.09536v5 |
2018-08-13 | A Nonsmooth Dynamical Systems Perspective on Accelerated Extensions of ADMM | Recently, there has been great interest in connections between
continuous-time dynamical systems and optimization methods, notably in the
context of accelerated methods for smooth and unconstrained problems. In this
paper we extend this perspective to nonsmooth and constrained problems by
obtaining differential inclusi... | 1808.04048v7 |
2018-09-20 | Relaxation in a Fuzzy Dark Matter Halo | Dark matter may be composed of light bosons, ${m_b \sim 10^{-22}\,
\mathrm{eV}}$, with a de Broglie wavelength $\lambda \sim 1 \,\mathrm{kpc}$ in
typical galactic potentials. Such `fuzzy' dark matter (FDM) behaves like cold
dark matter (CDM) on much larger scales than the de Broglie wavelength, but may
resolve some of ... | 1809.07673v2 |
2018-10-02 | How strongly does diffusion or logistic-type degradation affect existence of global weak solutions in a chemotaxis-Navier--Stokes system? | This paper considers the chemotaxis-Navier--Stokes system with nonlinear
diffusion and logistic-type degradation term \begin{align*} \begin{cases} n_t +
u\cdot\nabla n = \nabla \cdot(D(n)\nabla n) - \nabla\cdot(n \chi(c) \nabla c) +
\kappa n - \mu n^\alpha, & x\in \Omega,\ t>0, \\ c_t + u\cdot\nabla c = \Delta
c - nf(c... | 1810.01098v2 |
2018-10-05 | Magnetic field direction dependent antiskyrmion motion with microwave electric fields | Magnetic skyrmions are regarded as promising information candidates in future
spintronic devices, which have been investigated theoretically and
experimentally in isotropic system. Recently, the sta- bilization of
antiskyrmions in the presence of anisotropic Dzyaloshinskii-Moriya interaction
and its dynamics driven by ... | 1810.02464v1 |
2018-10-22 | Polarized Raman spectroscopy study of metallic $(Sr_{1-x}La_{x})_{3}Ir_{2}O_{7}$: a consistent picture of disorder-interrupted unidirectional charge order | We have used rotational anisotropic polarized Raman spectroscopy to study the
symmetries, the temperature and the doping dependence of the charge ordered
state in metallic $(Sr_{1-x}La_{x})_{3}Ir_{2}O_{7}$. Although the Raman probe
size is greater than the charge ordering length, we establish that the charge
ordering b... | 1810.09087v2 |
2018-11-30 | Dynamical precession of spin in the two-dimensional spin-orbit coupled systems | We investigate the spin dynamics in the two-dimensional spin-orbit coupled
system subject to an in-plane ($x$-$y$ plane) constant electric field, which is
assumed to be turned on at the moment $t=0$. The equation of spin precession in
linear response to the switch-on of the electric field is derived in terms of
Heisenb... | 1811.12626v2 |
2019-01-25 | Gravitational waves from dynamical tides in white dwarf binaries | We study the effect of tidal forcing on gravitational wave signals from
tidally relaxed white dwarf pairs in the LISA, DECIGO and BBO frequency band
($0.1-100\,{\rm mHz}$). We show that for stars not in hydrostatic equilibrium
(in their own rotating frames), tidal forcing will result in energy and angular
momentum exch... | 1901.09045v2 |
2019-01-31 | Angular momentum Josephson effect between two isolated condensates | We demonstrate that the two degenerate energy levels in spin-orbit coupled
trapped Bose gases, coupled by a quenched Zeeman field, can be used for angular
momentum Josephson effect. In a static quenched field, we can realize a
Josephson oscillation with period ranging from millisecond to hundreds of
milliseconds. Moreo... | 1901.11449v2 |
2019-03-27 | Field-free spin-orbit-torque switching of perpendicular magnetization aided by uniaxial shape anisotropy | It has been demonstrated that the switching of perpendicular magnetization
can be achieved with spin orbit torque (SOT) at an ultrafast speed and low
energy consumption. However, to make the switching deterministic, an
undesirable magnetic field or unconventional device geometry is required to
break the structure inver... | 1903.11487v1 |
2019-06-18 | Nonlinear Langevin dynamics via holography | In this work, we consider non-linear corrections to the Langevin effective
theory of a heavy quark moving through a strongly coupled CFT plasma. In
AdS/CFT, this system can be identified with that of a string stretched between
the boundary and the horizon of an asymptotically AdS black-brane solution. We
compute the Fe... | 1906.07762v3 |
2019-06-24 | Emergence of localized persistent weakly-evanescent cortical brain wave loops | An inhomogeneous anisotropic physical model of the brain cortex is presented
that predicts the emergence of non--evanescent (weakly damped) wave--like modes
propagating in the thin cortex layers transverse to both the mean neural fiber
direction and to the cortex spatial gradient. Although the amplitude of these
modes ... | 1906.09717v1 |
2019-12-16 | Spin-current manipulation of photoinduced magnetization dynamics in heavy metal / ferromagnet double layer based nanostructures | Spin currents offer a way to control static and dynamic magnetic properties,
and therefore they are crucial for next-generation MRAM devices or spin-torque
oscillators. Manipulating the dynamics is especially interesting within the
context of photo-magnonics. In typical $3d$ transition metal ferromagnets like
CoFeB, th... | 1912.07728v1 |
2019-12-18 | Tidal evolution of circumbinary systems with arbitrary eccentricities: applications for Kepler systems | We present an extended version of the Constant Time Lag analytical approach
for the tidal evolution of circumbinary planets introduced in our previous
work. The model is self-consistent, in the sense that all tidal interactions
between pairs are computed, regardless of their size. We derive analytical
expressions for t... | 1912.08728v1 |
2020-01-01 | Nonequilibrium Landau-Zener Tunneling in Exciton-Polariton Condensates | For a coherent quantum mechanical two-level system driven with a linearly
time-dependent detuning, the Landau-Zener model has served over decades as a
textbook model of quantum dynamics. A particularly intriguing question is
whether that framework can be extended to capture an intrinsical nonequilibrium
nature for a qu... | 2001.00151v1 |
2020-01-14 | A bound on the 12C/13C ratio in near-pristine gas with ESPRESSO | Using science verification observations obtained with ESPRESSO at the Very
Large Telescope (VLT) in 4UT mode, we report the first bound on the carbon
isotope ratio 12C/13C of a quiescent, near-pristine damped Ly-alpha (DLA)
system at z=2.34. We recover a limit log10(12C/13C) > +0.37 (2 sigma). We use
the abundance patt... | 2001.04983v1 |
2020-01-14 | Limits on Mode Coherence in Pulsating DA White Dwarfs Due to a Non-static Convection Zone | The standard theory of pulsations deals with the frequencies and growth rates
of infinitesimal perturbations in a stellar model. Modes which are calculated
to be linearly driven should increase their amplitudes exponentially with time;
the fact that nearly constant amplitudes are usually observed is evidence that
nonli... | 2001.05048v1 |
2020-01-30 | An auto-parameter denoising method for nuclear magnetic resonance spectroscopy based on low-rank Hankel matrix | Nuclear Magnetic Resonance (NMR) spectroscopy, which is modeled as the sum of
damped exponential signals, has become an indispensable tool in various
scenarios, such as the structure and function determination, chemical analysis,
and disease diagnosis. NMR spectroscopy signals, however, are usually corrupted
by Gaussia... | 2001.11815v2 |
2020-02-26 | Velocity-coherent Filaments in NGC 1333: Evidence for Accretion Flow? | Recent observations of global velocity gradients across and along molecular
filaments have been interpreted as signs of gas accreting onto and along these
filaments, potentially feeding star-forming cores and proto-clusters. The
behavior of velocity gradients in filaments, however, has not been studied in
detail, parti... | 2002.11736v1 |
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 |
2020-03-12 | Skyrmion Dynamics and Transverse Mobility: Skyrmion Hall Angle Reversal on 2D Periodic Substrates with dc and Biharmonic ac Drives | We numerically examine the dynamics of a skyrmion interacting with a
two-dimensional periodic substrate under dc and biharmonic ac drives. We show
that the Magnus force of the skyrmion produces circular orbits that can
resonate with the ac drive and the periodicity of the substrate to create
quantized motion both paral... | 2003.05972v1 |
2020-03-16 | Dimensional crossovers and Casimir forces for the Bose gas in anisotropic optical lattices | We consider the Bose gas on a $d$-dimensional anisotropic lattice employing
the imperfect (mean-field) gas as a prototype example. We study the dimensional
crossover arising as a result of varying the dispersion relation at finite
temperature $T$. We analyze in particular situations where one of the relevant
effective ... | 2003.07458v3 |
2020-04-25 | Quasinormal modes of the test fields in the novel 4D Einstein-Gauss-Bonnet-de Sitter gravity | The regularization proposed in [D.~Glavan and C.~Lin, Phys.\ Rev.\ Lett.\
{\bf 124}, 081301 (2020)] led to the black hole solutions which turned out to
be the solutions of the consistent well-defined $4$-dimensional
Einstein-Gauss-Bonnet theory of gravity suggested in [K.~Aoki, M.~Gorji and
S.~Mukohyama, arXiv:2005.038... | 2004.14172v2 |
2020-06-08 | Detection and parameter estimation of binary neutron star merger remnants | Detection and parameter estimation of binary neutron star merger remnants can
shed light on the physics of hot matter at supranuclear densities. Here we
develop a fast, simple model that can generate gravitational waveforms, and
show it can be used for both detection and parameter estimation of post-merger
remnants. Th... | 2006.04396v1 |
2020-06-10 | Study of magnetic interface and its effect in Fe/NiFe bilayers of alternating order | We present a comprehensive study on the magnetization reversal in Fe/NiFe
bilayer system by alternating the order of the magnetic layers. All the samples
show growth-induced uniaxial magnetic anisotropy due to oblique angle
deposition technique. Strong interfacial exchange coupling between the Fe and
NiFe layers leads ... | 2006.05756v1 |
2020-07-29 | Dynamics of antiferromagnetic skyrmion in absence and presence of pinning defect | A theoretical study on the dynamics of an antiferromagnetic (AFM) skyrmion is
indispensable for revealing the underlying physics and understanding the
numerical and experimental observations. In this work, we present a reliable
theoretical treatment of the spin current induced motion of an AFM skyrmion in
the absence a... | 2007.14562v1 |
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 |
2020-08-15 | Stability analysis of the linear discrete teleoperation systems with stochastic sampling and data dropout | This paper addresses the stability conditions of the sampled-data
teleoperation systems consisting continuous time master, slave, operator, and
environment with discrete time controllers over general communication networks.
The output signals of the slave and master robots are quantized with stochastic
sampling periods... | 2008.06683v1 |
2020-08-25 | The Sandwich Mode for Vertical Shear Instability in Protoplanetary Disks | Turbulence has a profound impact on the evolution of gas and dust in
protoplanetary disks (PPDs), from driving the collisions and the diffusion of
dust grains, to the concentration of pebbles in giant vortices, thus,
facilitating planetesimal formation. The Vertical Shear Instability (VSI) is a
hydrodynamic mechanism, ... | 2008.11195v2 |
2020-09-07 | Spin pumping in d-wave superconductor/ferromagnet hybrids | Spin-pumping across ferromagnet/superconductor (F/S) interfaces has attracted
much attention lately. Yet the focus has been mainly on s-wave
superconductors-based systems whereas (high-temperature) d-wave superconductors
such as YBa2Cu3O7-d (YBCO) have received scarce attention despite their
fundamental and technologic... | 2009.03196v3 |
2020-09-22 | Magnon-mediated spin currents in Tm3Fe5O12/Pt with perpendicular magnetic anisotropy | The control of pure spin currents carried by magnons in magnetic insulator
(MI) garnet films with a robust perpendicular magnetic anisotropy (PMA) is of
great interest to spintronic technology as they can be used to carry, transport
and process information. Garnet films with PMA present labyrinth domain
magnetic struct... | 2009.10299v1 |
2020-09-29 | The one-dimensional stochastic Keller--Segel model with time-homogeneous spatial Wiener processes | Chemotaxis is a fundamental mechanism of cells and organisms, which is
responsible for attracting microbes to food, embryonic cells into developing
tissues, or immune cells to infection sites. Mathematically chemotaxis is
described by the Patlak--Keller--Segel model. This macroscopic system of
equations is derived from... | 2009.13789v1 |
2020-10-15 | Delayed bifurcation in elastic snap-through instabilities | We study elastic snap-through induced by a control parameter that evolves
dynamically. In particular, we study an elastic arch subject to an
end-shortening that evolves linearly with time, i.e. at a constant rate. For
large end-shortening the arch is bistable but, below a critical end-shortening,
the arch becomes monos... | 2010.07850v1 |
2020-10-29 | Connecting cosmological accretion to strong Lyman-alpha absorbers | We present an analytical model for the cosmological accretion of gas onto
dark matter halos, based on a similarity solution applicable to spherical
systems. Performing simplified radiative transfer, we compute how the accreting
gas turns increasingly neutral as it self-shields from the ionising background,
and obtain t... | 2010.15857v1 |
2020-11-25 | Early modified gravity in light of the $H_0$ tension and LSS data | We present a model of Early Modified Gravity (EMG) consisting in a scalar
field $\sigma$ with a non-minimal coupling to the Ricci curvature of the type
$M^2_{\rm pl}+\xi \sigma^2$ plus a cosmological constant and a small effective
mass and demonstrate its ability to alleviate the $H_0$ tension while providing
a good fi... | 2011.12934v2 |
2021-01-16 | Excitation and evolution of coronal oscillations in self-consistent 3D radiative MHD simulations of the solar atmosphere | Solar coronal loops are commonly subject to oscillations. Observations of
coronal oscillations are used to infer physical properties of the coronal
plasma using coronal seismology. Excitation and evolution of oscillations in
coronal loops is typically studied using highly idealised models of magnetic
flux-tubes. In ord... | 2101.06430v1 |
2021-02-17 | Linear Nearest Neighbor Flocks with All Distinct Agents | This paper analyzes the global dynamics of 1-dimensional agent arrays with
nearest neighbor linear couplings. The equations of motion are second order
linear ODEs with constant coeffcients. The novel part of this research is that
the couplings are different for each distinct agent. We allow the forces to
depend on the ... | 2102.09020v1 |
2021-03-18 | The APOGEE Data Release 16 Spectral Line List | The updated H-band spectral line list (from \lambda 15,000 - 17,000\AA)
adopted by the Apache Point Observatory Galactic Evolution Experiment (APOGEE)
for the SDSS IV Data Release 16 (DR16) is presented here. The APOGEE line list
is a combination of atomic and molecular lines with data from laboratory,
theoretical, and... | 2103.10112v1 |
2021-03-18 | Soft mode theory of ferroelectric phase transitions in the low-temperature phase | Historically, the soft mode theory of ferroelectric phase transitions has
been developed for the high-temperature (paraelectric) phase, where the phonon
mode softens upon decreasing the temperature. In the low-temperature
ferroelectric phase, a similar phonon softening occurs, also leading to a
bosonic condensation of ... | 2103.10262v1 |
2021-03-23 | High-order implicit time integration scheme based on Padé expansions | A single-step high-order implicit time integration scheme for the solution of
transient and wave propagation problems is presented. It is constructed from
the Pad\'e expansions of the matrix exponential solution of a system of
first-order ordinary differential equations formulated in the state-space. A
computationally ... | 2103.12282v1 |
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 |
2021-05-28 | Designing a Plasma Lens as a Matching Device for the ILC Positron Source | To realise a planned high-luminosity and high-energy $e^+e^-$-collider, as
the ILC, a large amount of positrons have to be produced and the accelerated
particles have to be captured and matched according to the damping ring
acceptances. %There exist several technical possibilities. In this contribution
a new promising ... | 2105.14008v1 |
2021-07-13 | Tuning the Optical Properties of an MoSe$_2$ Monolayer Using Nanoscale Plasmonic Antennas | Nanoplasmonic systems combined with optically-active two-dimensional
materials provide intriguing opportunities to explore and control light-matter
interactions at extreme sub-wavelength lengthscales approaching the exciton
Bohr radius. Here, we present room- and cryogenic-temperature investigations of
light-matter int... | 2107.06410v2 |
2021-09-10 | Electrical spectroscopy of the spin-wave dispersion and bistability in gallium-doped yttrium iron garnet | Yttrium iron garnet (YIG) is a magnetic insulator with record-low damping,
allowing spin-wave transport over macroscopic distances. Doping YIG with
gallium ions greatly reduces the demagnetizing field and introduces a
perpendicular magnetic anisotropy, which leads to an isotropic spin-wave
dispersion that facilitates s... | 2109.05045v1 |
2021-09-17 | Adaptive Steering Control for Steer-by-Wire Systems | Steer-by-Wire (SBW) systems are being adapted widely in semi-autonomous and
fully autonomous vehicles. The main control challenge in a SBW system is to
follow the steering commands in the face of parametric uncertainties, external
disturbances and actuator delay; crucially, perturbations in inertial
parameters and damp... | 2109.08380v1 |
2021-11-04 | Momentum-space decoherence of distinguishable and identical particles in the Caldeira-Leggett formalism | In this work, momentum-space decoherence using minimum and
nonminimum-uncertainty-product (stretched) Gaussian wave packets in the
framework of Caldeira-Leggett formalism and under the presence of a linear
potential is studied. As a dimensionless measure of decoherence, purity, a
quantity appearing in the definition of... | 2111.03127v1 |
2022-01-20 | Oxygen-enhanced extremely metal-poor DLAs: A signpost of the first stars? | We present precise abundance determinations of two near-pristine damped
Ly$\alpha$ systems (DLAs) to assess the nature of the [O/Fe] ratio at [Fe/H] <
-3 (i.e. <1/1000 of the solar metallicity). Prior observations indicate that
the [O/Fe] ratio is consistent with a constant value, [O/Fe] ~ +0.4, when -3 <
[Fe/H] < -2, ... | 2201.08394v1 |
2022-02-18 | Massive neutrino self-interactions with a light mediator in cosmology | Nonstandard self-interactions can alter the evolution of cosmological
neutrinos, mainly by damping free streaming, which should leave traces in
cosmological observables. Although overall effects are opposite to those
produced by neutrino mass and a larger $N_{\rm eff}$, they cannot be totally
canceled by these last. We... | 2202.09310v2 |
2022-02-16 | Egg-speriments: Stretch, crack, and spin | Eggs are key ingredients in our kitchens because of their nutritional values
and functional properties such as foaming, emulsifying and gelling, offering a
wide variety of culinary achievements. They also constitute ideal objects to
illustrate a myriad of scientific concepts. In this article, we focus on
several experi... | 2202.10243v1 |
2022-03-15 | Thermodynamic engine powered by anisotropic fluctuations | The purpose of this work is to present the concept of an autonomous
Stirling-like engine powered by anisotropy of thermodynamic fluctuations.
Specifically, simultaneous contact of a thermodynamic system with two heat
baths along coupled degrees of freedom generates torque and circulatory
currents -- an arrangement refe... | 2203.07573v2 |
2022-03-27 | Giant bulk spin-orbit torque and efficient electrical switching in single ferrimagnetic FeTb layers with strong perpendicular magnetic anisotropy | Efficient manipulation of antiferromagnetically coupled materials that are
integration-friendly and have strong perpendicular magnetic anisotropy (PMA) is
of great interest for low-power, fast, dense magnetic storage and computing.
Here, we report a distinct, giant bulk damping-like spin-orbit torque in
strong-PMA ferr... | 2203.14193v1 |
2022-04-11 | Diffusion of elastic waves in a continuum solid with a random array of pinned dislocations | The propagation of incoherent elastic energy in a three-dimensional solid due
to the scattering by many, randomly placed and oriented, pinned dislocation
segments, is considered in a continuum mechanics framework. The scattering
mechanism is that of an elastic string of length L that re-radiates as a
response to an inc... | 2204.05140v1 |
2022-04-17 | Dynamics of co-orbital exoplanets in a first order resonance chain with tidal dissipation | Co-orbital planets (in a $1:1$ mean motion resonance) can be formed within a
Laplace resonance chain. Here, we develop a secular model to study the dynamics
of the resonance chain $p:p:p+1$, where the co-orbital pair is in a first-order
mean motion resonance with the outermost third planet. Our model takes into
account... | 2204.08074v1 |
2022-04-26 | Quintom fields from chiral K-essence cosmology | In this paper, we present an analysis of a chiral cosmological scenario from
the perspective of K-essence formalism. In this setup, several scalar fields
interact within the kinetic and potential sectors. However, we only consider a
flat Friedmann--Robertson--Lama\^{\i}tre--Walker universe coupled minimally to
two quin... | 2204.12083v2 |
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