publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2023-05-13 | Global existence for a 3D Tropical Climate Model with damping and small initial data in $\dot H^{1/2}(\mathbb{R}^3)$ | We consider a 3D Tropical Climate Model with damping terms in the equation of
the barotropic mode $u$ and in the equation of the first baroclinic mode $v$ of
the velocity. The equation for the temperature $\theta$ is free from dampings.
We prove global existence in time for this system assuming the initial data
$(u_0, ... | 2305.07964v1 |
2023-06-21 | The effect of singularities and damping on the spectra of photonic crystals | Understanding the dispersive properties of photonic crystals is a fundamental
and well-studied problem. However, the introduction of singular permittivities
and damping complicates the otherwise straightforward theory. In this paper, we
study photonic crystals with a Drude-Lorentz model for the permittivity,
motivated ... | 2306.12254v1 |
2023-07-12 | Asymptotic behavior of solutions to the Cauchy problem for 1-D p-system with space dependent damping | We consider the Cauchy problem for one-dimensional p-system with damping of
space-dependent coefficient. This system models the compressible flow through
porous media in the Lagrangean coordinate. Our concern is an asymptotic
behavior of solutions, which is expected to be the diffusion wave based on the
Darcy law. To s... | 2307.05865v1 |
2023-07-12 | Parabolic-elliptic Keller-Segel's system | We study on the whole space R d the compressible Euler system with damping
coupled to the Poisson equation when the damping coefficient tends towards
infinity. We first prove a result of global existence for the Euler-Poisson
system in the case where the damping is large enough, then, in a second step,
we rigorously ju... | 2307.05981v1 |
2023-07-25 | Asymptotic behavior and life-span estimates for the damped inhomogeneous nonlinear Schrödinger equation | We are interested in the behavior of solutions to the damped inhomogeneous
nonlinear Schr\"odinger equation $ i\partial_tu+\Delta
u+\mu|x|^{-b}|u|^{\alpha}u+iau=0$, $\mu \in\mathbb{C} $, $b>0$, $a \in
\mathbb{C}$ such that $\Re \textit{e}(a) \geq 0$, $\alpha>0$. We establish
lower and upper bound estimates of the life-... | 2307.13495v1 |
2023-07-26 | On nonlinear Landau damping and Gevrey regularity | In this article we study the problem of nonlinear Landau damping for the
Vlasov-Poisson equations on the torus. As our main result we show that for
perturbations initially of size $\epsilon>0$ and time intervals
$(0,\epsilon^{-N})$ one obtains nonlinear stability in regularity classes
larger than Gevrey $3$, uniformly ... | 2307.14271v1 |
2023-08-18 | Damping for fractional wave equations and applications to water waves | Motivated by numerically modeling surface waves for inviscid Euler equations,
we analyze linear models for damped water waves and establish decay properties
for the energy for sufficiently regular initial configurations. Our findings
give the explicit decay rates for the energy, but do not address
reflection/transmissi... | 2308.09288v1 |
2023-08-30 | Optimal decay for one-dimensional damped wave equations with potentials via a variant of Nash inequality | The optimality of decay properties of the one-dimensional damped wave
equations with potentials belonging to a certain class is discussed. The
typical ingredient is a variant of Nash inequality which involves an invariant
measure for the corresponding Schr\"odinger semigroup. This enables us to find
a sharp decay estim... | 2308.15680v1 |
2023-09-15 | Explicit solutions and linear inviscid damping in the Euler-Boussinesq equation near a stratified Couette flow in the periodic strip | This short note provides explicit solutions to the linearized Boussinesq
equations around the stably stratified Couette flow posed on
$\mathbb{T}\times\mathbb{R}$. We consider the long-time behavior of such
solutions and prove inviscid damping of the perturbed density and velocity
field for any positive Richardson numb... | 2309.08419v2 |
2023-09-21 | Beyond Qubits : An Extensive Noise Analysis for Qutrit Quantum Teleportation | The four quantum noises Bit Flip, Phase Flip, Depolarization, and Amplitude
Damping as well as any potential combinations of them are examined in this
papers investigation of quantum teleportation using qutrit states. Among the
above mentioned noises, we observed phase flip has highest fidelity. Compared
to uncorrelate... | 2309.12163v1 |
2023-12-22 | Soliton resolution for the energy critical damped wave equations in the radial case | We consider energy-critical damped wave equation \begin{equation*}
\partial_{tt}u-\Delta u+\alpha \partial_t u=\left|u\right|^{\frac{4}{D-2}}u
\end{equation*} with radial initial data in dimensions $D\geq 4$. The equation
has a nontrivial radial stationary solution $W$, called the ground state, which
is unique up to si... | 2401.04115v2 |
2024-01-22 | Damping-Enhanced Magnon Transmission | The inevitable Gilbert damping in magnetization dynamics is usually regarded
as detrimental to spin transport. Here we demonstrate in a
ferromagnetic-insulator--normal-metal heterostructure that the strong momentum
dependence and chirality of the eddy-current-induced damping causes also
beneficial scattering properties... | 2401.12022v1 |
2024-02-18 | Sharp lifespan estimate for the compressible Euler system with critical time-dependent damping in $\R^2$ | This paper concerns the long time existence to the smooth solutions of the
compressible Euler system with critical time dependent damping in $\R^2$. We
establish the sharp lifespan estimate from below, with respect to the small
parameter of the initial perturbation. For this end, the vector fields
$\widehat{Z}$ (define... | 2402.11516v1 |
2024-02-28 | Linear inviscid damping in the presence of an embedding eigenvalue | In this paper, we investigate the long-time dynamics of the linearized 2-D
Euler equations around a hyperbolic tangent flow $(\tanh y,0)$. A key
difference compared to previous results is that the linearized operator has an
embedding eigenvalue, which has a significant impact on the dynamics of the
linearized system. F... | 2402.18229v1 |
2024-03-19 | Improved decay results for micropolar flows with nonlinear damping | We examine the long-time behavior of solutions (and their derivatives) to the
micropolar equations with nonlinear velocity damping. Additionally, we get a
speed-up gain of $ t^{1/2} $ for the angular velocity, consistent with
established findings for classic micropolar flows lacking nonlinear damping.
Consequently, we ... | 2403.12885v1 |
2024-03-26 | On a class of nonautonomous quasilinear systems with general time-gradually-degenerate damping | In this paper, we study two systems with a time-variable coefficient and
general time-gradually-degenerate damping. More explicitly, we construct the
Riemann solutions to the time-variable coefficient Zeldovich approximation and
time-variable coefficient pressureless gas systems both with general
time-gradually-degener... | 2403.17732v1 |
2024-04-09 | Phase space contraction of degenerately damped random splittings | When studying out-of-equilibrium systems, one often excites the dynamics in
some degrees of freedom while removing the excitation in others through
damping. In order for the system to converge to a statistical steady state, the
dynamics must transfer the energy from the excited modes to the dissipative
directions. The ... | 2404.06465v1 |
2002-09-30 | The Cosmic Microwave Background & Inflation, Then & Now | Boomerang, Maxima, DASI, CBI and VSA significantly increase the case for
accelerated expansion in the early universe (the inflationary paradigm) and at
the current epoch (dark energy dominance), especially when combined with data
on high redshift supernovae (SN1) and large scale structure (LSS). There are
``7 pillars o... | 0210007v1 |
2003-06-17 | Kinetic equilibrium of iron in the atmospheres of cool stars III. The ionization equilibrium of selected reference stars | Non-LTE line formation calculations of Fe I are performed for a small number
of reference stars to investigate and quantify the efficiency of neutral
hydrogen collisions. Using the atomic model that was described in previous
publications, the final discrimination with respect to hydrogen collisions is
based on the cond... | 0306337v1 |
2003-10-08 | Signatures of Relativistic Neutrinos in CMB Anisotropy and Matter Clustering | We present a detailed analytical study of ultra-relativistic neutrinos in
cosmological perturbation theory and of the observable signatures of
inhomogeneities in the cosmic neutrino background. We note that a modification
of perturbation variables that removes all the time derivatives of scalar
gravitational potentials... | 0310198v3 |
2004-09-22 | First stars VI - Abundances of C, N, O, Li, and mixing in extremely metal-poor giants. Galactic evolution of the light elements | We have investigated the poorly-understood origin of nitrogen in the early
Galaxy by determining N abundances in 35 extremely metal-poor halo giants (22
stars have [Fe/H]<-3.0) using the C and O abundances determined in Paper V.
Because any dredge-up of CNO processed material to the surface may complicate
the interpret... | 0409536v3 |
2005-09-15 | Damped Lyman Alpha Systems at z<1.65: The Expanded SDSS HST Sample | We present results of our HST Cycle 11 Survey for low-redshift (z<1.65) DLAs
in the UV spectra of quasars selected from the SDSS Early Data Release. These
quasars have strong intervening MgII-FeII systems which are known signatures of
high column density neutral gas. In total, UV observations of Ly-alpha
absorption in ... | 0509469v1 |
2007-01-03 | HI 21cm absorption at $z \sim 3.39$ towards PKS 0201+113 | We report the GMRT detection of HI 21cm absorption from the $z \sim 3.39$
damped Lyman-$\alpha$ absorber (DLA) towards PKS 0201+113, the highest redshift
at which 21cm absorption has been detected in a DLA. The absorption is spread
over $\sim 115$ km s$^{-1}$ and has two components, at $z = 3.387144 (17)$ and
$z = 3.38... | 0701074v2 |
2004-10-24 | Field theory of the inverse cascade in two-dimensional turbulence | A two-dimensional fluid, stirred at high wavenumbers and damped by both
viscosity and linear friction, is modeled by a statistical field theory. The
fluid's long-distance behavior is studied using renormalization-group (RG)
methods, as begun by Forster, Nelson, and Stephen [Phys. Rev. A 16, 732
(1977)]. With friction, ... | 0410050v2 |
2004-09-20 | Effect of the Vacuum Energy Density on Graviton Propagation | It is known that the value L of the vacuum energy density affects the
propagation equation for gravitons: A mass term appears in the propagation
equation, such that m^2=-L. As a consequence, the polarization states of
gravitons also change. This effect of the L-term has been confirmed by recent
calculations in a curved... | 0409098v1 |
2006-07-02 | Physics of Flow Instability and Turbulent Transition in Shear Flows | In this paper, the physics of flow instability and turbulent transition in
shear flows is studied by analyzing the energy variation of fluid particles
under the interaction of base flow with a disturbance. For the first time, a
model derived strictly from physics is proposed to show that the flow
instability under fini... | 0607004v5 |
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 |
2007-08-06 | Ejection of Supermassive Black Holes from Galaxy Cores | [Abridged] Recent numerical relativity simulations have shown that the
emission of gravitational waves during the merger of two supermassive black
holes (SMBHs) delivers a kick to the final hole, with a magnitude as large as
4000 km/s. We study the motion of SMBHs ejected from galaxy cores by such kicks
and the effects... | 0708.0771v2 |
2007-11-19 | Effect of the intergalactic environment on the observability of Ly-alpha emitters during reionization | Observations of high-redshift Ly-alpha sources are a major tool for studying
the high-redshift Universe. We discuss the effect of the reionizing
intergalactic medium on the observability of Ly-alpha sources based on large
simulations of early structure formation with radiative transfer. This takes
into account self-con... | 0711.2944v2 |
2007-12-17 | The Nitrogen and Oxygen abundances in the neutral gas at high redshift | We study the Oxygen and Nitrogen abundances in the interstellar medium of
high-redshift galaxies. We use high resolution and high signal-to-noise ratio
spectra of Damped Lyman-alpha (DLA) systems detected along the line-of-sight to
quasars to derive robust abundance measurements from unsaturated metal
absorption lines.... | 0712.2760v1 |
2008-10-26 | Non-linear Study of Bell's Cosmic Ray Current-driven Instability | The cosmic ray current-driven (CRCD) instability, predicted by Bell (2004),
consists of non-resonant, growing plasma waves driven by the electric current
of cosmic rays (CRs) that stream along the magnetic field ahead of both
relativistic and non-relativistic shocks. Combining an analytic, kinetic model
with one-, two-... | 0810.4565v1 |
2008-10-27 | Determination of the neutron star mass-radii relation using narrow-band gravitational wave detector | The direct detection of gravitational waves will provide valuable
astrophysical information about many celestial objects. The most promising
sources of gravitational waves are neutron stars and black holes. These objects
emit waves in a very wide spectrum of frequencies determined by their
quasi-normal modes oscillatio... | 0810.4848v4 |
2009-02-17 | 21-cm absorbers at intermediate redshifts | Damped Lyman-alpha systems (DLAs) seen in the spectra of high-z QSOs allow us
to probe the physical conditions in protogalaxies. Our understanding of
physical conditions in DLAs at high-z is primarily based on the absorption
lines of H_2 molecules and fine-structure transitions. Another important way of
probing the the... | 0902.3016v1 |
2009-08-27 | Very Light Magnetized Jets on Large Scales - I. Evolution and Magnetic Fields | Magnetic fields, which are undoubtedly present in extragalactic jets and
responsible for the observed synchrotron radiation, can affect the morphology
and dynamics of the jets and their interaction with the ambient cluster medium.
We examine the jet propagation, morphology and magnetic field structure for a
wide range ... | 0908.4055v1 |
2009-10-12 | Average luminosity distance in inhomogeneous universes | The paper studies the correction to the distance modulus induced by
inhomogeneities and averaged over all directions from a given observer. The
inhomogeneities are modeled as mass-compensated voids in random or regular
lattices within Swiss-cheese universes. Void radii below 300 Mpc are
considered, which are supported ... | 0910.2611v3 |
2009-12-22 | Rest-frame ultraviolet spectrum of the gravitationally lensed galaxy `the 8 o'clock arc': stellar and interstellar medium properties | We present the first detailed analysis of the rest-frame UV spectrum of the
gravitationally lensed Lyman break galaxy (LBG), the `8 o'clock arc'. The
spectrum of the 8 o'clock arc is rich in stellar and interstellar medium (ISM)
features, and presents several similarities to the well-known MS1512-cB58 LBG.
The stellar ... | 0912.4384v1 |
2010-07-19 | The Evolution of Lyman Limit Absorption Systems to Redshift Six | We have measured the redshift evolution of the density of Lyman limit systems
(LLS) in the intergalactic medium over the redshift range 0 < z < 6. We have
used two new quasar samples to (1) improve coverage at z ~ 1, with GALEX grism
spectrograph observations of 50 quasars with 0.8 < z_em < 1.3, and (2) extend
coverage... | 1007.3262v2 |
2010-11-01 | A Model for Thermal Phase Variations of Circular and Eccentric Exoplanets | We present a semi-analytic model atmosphere for close-in exoplanets that
captures the essential physics of phase curves: orbital and viewing geometry,
advection, and re-radiation. We calibrate the model with the well-characterized
transiting planet, HD 189733b, then compute light curves for seven of the most
eccentric ... | 1011.0428v1 |
2010-12-16 | Constraints on coronal turbulence models from source sizes of noise storms at 327 MHz | We seek to reconcile observations of small source sizes in the solar corona
at 327 MHz with predictions of scattering models that incorporate refractive
index effects, inner scale effects and a spherically diverging wavefront. We
use an empirical prescription for the turbulence amplitude $C_{N}^{2}(R)$ based
on VLBI ob... | 1012.3523v2 |
2011-01-25 | The Surprisingly Constant Strength of O VI Absorbers over Cosmic Time | O VI absorption is observed in a wide range of astrophysical environments,
including the Local ISM, the disk and halo of the Milky Way, high-velocity
clouds, the Magellanic clouds, starburst galaxies, the intergalactic medium,
damped Lyman-alpha systems, and gamma-ray-burst host galaxies. Here a new
compilation of 775 ... | 1101.4766v1 |
2011-03-21 | A Groundbased Imaging Study of Galaxies Causing DLA, subDLA, and LLS Absorption in Quasar Spectra | We present results from a search for galaxies that give rise to damped Lyman
alpha (DLA), subDLA, and Lyman limit system (LLS) absorption at redshifts 0.1
~< z ~< 1 in the spectra of background quasars. The sample was formed from a
larger sample of strong MgII absorbers (W_0^(2796) >= 0.3 A) whose HI column
densities w... | 1103.4047v3 |
2011-05-06 | Non-relativistic bound states in a moving thermal bath | We study the propagation of non-relativistic bound states moving at constant
velocity across a homogeneous thermal bath and we develop the effective field
theory which is relevant in various dynamical regimes. We consider values of
the velocity of the bound state ranging from moderate to highly relativistic
and tempera... | 1105.1249v2 |
2011-08-24 | Dynamical Tides in Compact White Dwarf Binaries: Tidal Synchronization and Dissipation | In compact white dwarf (WD) binary systems (with periods ranging from minutes
to hours), dynamical tides involving the excitation and dissipation of gravity
waves play a dominant role in determining the physical conditions of the WDs
prior to mass transfer or binary merger. We calculate the amplitude of the
tidally exc... | 1108.4910v5 |
2011-11-22 | Coronal heating in coupled photosphere-chromosphere-coronal systems: turbulence and leakage | Coronal loops act as resonant cavities for low frequency fluctuations that
are transmitted from the deeper layers of the solar atmosphere and are
amplified in the corona, triggering nonlinear interactions. However trapping is
not perfect, some energy leaks down to the chromosphere, thus limiting the
turbulence developm... | 1111.5359v1 |
2012-06-22 | Cosmic Acceleration from Causal Backreaction with Recursive Nonlinearities | We revisit the causal backreaction paradigm, in which the need for Dark
Energy is eliminated via the generation of an apparent cosmic acceleration from
the causal flow of inhomogeneity information coming in towards each observer
from distant structure-forming regions. This second-generation formalism
incorporates "recu... | 1206.5056v1 |
2012-10-10 | Bodily tides near the 1:1 spin-orbit resonance. Correction to Goldreich's dynamical model | Spin-orbit coupling is often described in the "MacDonald torque" approach
which has become the textbook standard. Within this method, a concise
expression for the additional tidal potential, derived by MacDonald (1964; Rev.
Geophys. 2, 467), is combined with an assumption that the Q factor is
frequency-independent (i.e... | 1210.2923v3 |
2012-11-06 | Tidal resonance locks in inspiraling white dwarf binaries | We calculate the tidal response of helium and carbon/oxygen (C/O) white dwarf
(WD) binaries inspiraling due to gravitational wave emission. We show that
resonance locks, previously considered in binaries with an early-type star,
occur universally in WD binaries. In a resonance lock, the orbital and spin
frequencies evo... | 1211.1393v4 |
2013-06-17 | GRB 130606A as a Probe of the Intergalactic Medium and the Interstellar Medium in a Star-forming Galaxy in the First Gyr After the Big Bang | We present high signal-to-noise ratio Gemini and MMT spectroscopy of the
optical afterglow of the gamma-ray burst (GRB) 130606A at redshift z=5.913,
discovered by Swift. This is the first high-redshift GRB afterglow to have
spectra of comparable quality to those of z~6 quasars. The data exhibit a
smooth continuum at ne... | 1306.3949v2 |
2013-10-31 | Spatially Resolved Emission of a High Redshift DLA Galaxy with the Keck/OSIRIS IFU | We present the first Keck/OSIRIS infrared IFU observations of a high redshift
damped Lyman-alpha (DLA) galaxy detected in the line of sight to a background
quasar. By utilizing the Laser Guide Star Adaptive Optics (LGSAO) to reduce the
quasar PSF to FWHM~0.15 arcsec, we were able to search for and map the
foreground DL... | 1311.0045v1 |
2013-11-29 | Continuous Emission of A Radiation Quantum | It is in accordance with such experiments as single photon self-interference
that a photon, conveying one radiation energy quantum "$ h \times$ frequency",
is spatially extensive and stretches an electromagnetic wave train. A wave
train, hence an energy quantum, can only be emitted by its source gradually. In
both the ... | 1312.0918v1 |
2014-02-06 | Dynamics of Order Parameters near Stationary States in Superconductors with a Charge-Density Wave | We consider a simple model of a quasi-one-dimensional conductor in which two
order parameters (OP) may coexist, i.e., the superconducting OP $\Delta$ and
the OP $W$ that characterizes the amplitude of a charge-density wave (CDW). In
the mean field approximation we present equations for the matrix Green's
functions $G_{... | 1402.1411v4 |
2014-05-28 | GRB 140515A at z=6.33: Constraints on the End of Reionization From a Gamma-ray Burst in a Low Hydrogen Column Density Environment | We present the discovery and subsequent spectroscopy with Gemini-North of the
optical afterglow of the Swift gamma-ray burst (GRB) 140515A. The spectrum
exhibits a well-detected continuum at wavelengths longer than 8915 Angs with a
steep decrement to zero flux blueward of 8910 Angs due to Ly-alpha absorption
at redshif... | 1405.7400v1 |
2014-08-24 | Thickness dependence of dynamic and static magnetic properties of pulsed laser deposited La$_{0.7}$Sr$_{0.3}$MnO$_3$ films on SrTiO$_3$(001) | We present a comprehensive study of the thickness dependence of static and
magneto-dynamic magnetic properties of La$_{0.7}$Sr$_{0.3}$MnO$_3$. Epitaxial
pulsed laser deposited La$_{0.7}$Sr$_{0.3}$MnO$_3$ / SrTiO$_3$(001) thin films
in the range from 3 unit cells (uc) to 40 uc (1.2 - 16 nm) have been
investigated throug... | 1408.5631v1 |
2015-01-27 | Comparative analysis of existing models for power-grid synchronization | The dynamics of power-grid networks is becoming an increasingly active area
of research within the physics and network science communities. The results
from such studies are typically insightful and illustrative, but are often
based on simplifying assumptions that can be either difficult to assess or not
fully justifie... | 1501.06926v2 |
2015-04-28 | A meeting point of entropy and bifurcations in cross-diffusion herding | A cross-diffusion system modeling the information herding of individuals is
analyzed in a bounded domain with no-flux boundary conditions. The variables
are the species' density and an influence function which modifies the
information state of the individuals. The cross-diffusion term may stabilize or
destabilize the s... | 1504.07555v4 |
2015-05-29 | Microscopic Theory for Coupled Atomistic Magnetization and Lattice Dynamics | A coupled atomistic spin and lattice dynamics approach is developed which
merges the dynamics of these two degrees of freedom into a single set of
coupled equations of motion. The underlying microscopic model comprises local
exchange interactions between the electron spin and magnetic moment and the
local couplings bet... | 1505.08005v3 |
2015-06-18 | Galaxy power spectrum in redshift space: combining perturbation theory with the halo model | Theoretical modeling of the redshift-space power spectrum of galaxies is
crucially important to correctly extract cosmological information from redshift
surveys. The task is complicated by the nonlinear biasing and redshift space
distortion effects, which change with halo mass, and by the wide distribution
of halo mass... | 1506.05814v2 |
2015-10-25 | A class of chemotaxis systems with growth source and nonlinear secretion | In this paper, we are concerned with a class of parabolic-elliptic chemotaxis
systems encompassing the prototype $$\left\{\begin{array}{lll} &u_t =
\nabla\cdot(\nabla u-\chi u\nabla v)+f(u), & x\in \Omega, t>0, \\[0.2cm] &0=
\Delta v -v+u^\kappa, & x\in \Omega, t>0 \end{array}\right. $$ with nonnegative
initial conditi... | 1510.07204v1 |
2017-01-20 | On the Transition from Potential Flow to Turbulence Around a Microsphere Oscillating in Superfluid ^4He | The flow of superfluid $^4$He around a translationally oscillating sphere,
levitating without mechanical support, can either be laminar or turbulent,
depending on the velocity amplitude. Below a critical velocity $v_c$ that
scales as $\omega ^{1/2}$, and is temperature independent below 1 K, the flow
is laminar (potent... | 1701.05733v2 |
2017-02-04 | Brightness Temperature of Radio Zebras and Wave Energy Densities in Their Sources | We estimated the brightness temperature of radio zebras (zebra pattern --
ZP), considering that ZPs are generated in loops having an exponential density
profile in their cross-section. We took into account that when in plasma there
is a source emitting in all directions, then in the escape process from the
plasma the e... | 1702.01278v2 |
2017-03-02 | Pinch dynamics in a low-$β$ plasma | The relaxation of a helical magnetic field ${\bf B}({\bf x}, t)$ in a
high-conductivity plasma contained in the annulus between two perfectly
conducting coaxial cylinders is considered. The plasma is of low density and
its pressure is negligible compared with the magnetic pressure; the flow of the
plasma is driven by t... | 1703.00708v1 |
2017-04-18 | Outbursts of the intermediate-mass black hole HLX-1: a wind instability scenario | We model the intermediate-mass black hole HLX-1, using the Hubble Space
Telescope, XMM-Newton and Swift. We quantify the relative contributions of a
bluer component, function of X-ray irradiation, and a redder component,
constant and likely coming from an old stellar population. We estimate a black
hole mass of about (... | 1704.05468v1 |
2017-07-04 | Lattice symmetries and the topological protected transport of colloidal particles | The topologically protected transport of colloidal particles on top of
magnetic patterns of all possible single lattice constant two dimensional
magnetic point group symmetries is studied experimentally, theoretically, and
with numerical simulations. We examine the transport of colloidal particles in
response to modula... | 1707.00861v1 |
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 |
2018-05-15 | Nonreciprocal charge transport in two-dimensional noncentrosymmetric superconductors | Nonreciprocal charge transport phenomena are studied theoretically for
two-dimensional noncentrosymmetric superconductors under an external magnetic
field $B$. Rashba superconductors, surface superconductivity on the surface of
three-dimensional topological insulators, and transition metal dichalcogenides
(TMD) are rep... | 1805.05735v1 |
2018-07-27 | Phase spreading and temporal coherence of a pair-condensed Fermi gas at low temperature | A condensate of pairs in an isolated, homogeneous, unpolarised, finite-size
spin 1/2 Fermi gas at low nonzero temperature T, undergoes with time a phase
change with a random component, due to coupling to the gas thermal phonons.
With the quantum second Josephson relation relating the derivative of the
condensate phase ... | 1807.10476v2 |
2018-09-24 | Laser cooling and magneto-optical trapping of molecules analyzed using optical Bloch equations and the Fokker-Planck-Kramers equation | We study theoretically the behavior of laser-cooled calcium monofluoride
(CaF) molecules in an optical molasses and magneto-optical trap (MOT), and
compare our results to recent experiments. We use multi-level optical Bloch
equations to estimate the force and the diffusion constant, followed by a
Fokker-Planck-Kramers ... | 1809.08833v4 |
2019-02-01 | The Neutrino Puzzle: Anomalies, Interactions, and Cosmological Tensions | New physics in the neutrino sector might be necessary to address anomalies
between different neutrino oscillation experiments. Intriguingly, it also
offers a possible solution to the discrepant cosmological measurements of $H_0$
and $\sigma_8$. We show here that delaying the onset of neutrino free-streaming
until close... | 1902.00534v2 |
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 |
2019-03-19 | Phase mixing of nonlinear Alfven waves | Aims: This paper presents 2.5D numerical experiments of Alfv\'en wave phase
mixing and aims to assess the effects of nonlinearities on wave behaviour and
dissipation. In addition, this paper aims to quantify how effective the model
presented in this work is at providing energy to the coronal volume.
Methods: The mode... | 1903.08093v1 |
2019-07-30 | Rapid Reionization by the Oligarchs: The Case for Massive, UV-Bright, Star-Forming Galaxies with High Escape Fractions | The protagonists of cosmic reionization remain elusive. Faint star-forming
galaxies are leading candidates because they are numerous and may have
significant ionizing photon escape fractions ($f_{esc}$). Here we update this
picture via an empirical model that successfully predicts latest observations
(e.g., the drop in... | 1907.13130v2 |
2019-09-13 | Multi-Particle Collisions in Microgravity: Coefficient of Restitution and Sticking Threshold for Systems of Mm-Sized Particles | The current model of planet formation lacks a good understanding of the
growth of dust particles inside the protoplanetary disk beyond mm sizes. In
order to investigate the low-velocity collisions between this type of
particles, the NanoRocks experiment was flown on the International Space
Station (ISS) between Septemb... | 1909.06417v1 |
2019-10-14 | A search for optical AGN variability in 35,000 low-mass galaxies with the Palomar Transient Factory | We present an analysis of the long-term optical variability for $\sim50,000$
nearby (z<0.055) galaxies from the NASA-Sloan Atlas, $35,000$ of which are
low-mass ($M_{\ast}<10^{10}~M_{\odot}$). We use difference imaging of Palomar
Transient Factory (PTF) R-band observations to construct light curves with
typical baselin... | 1910.06342v1 |
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 |
2019-10-31 | One-point probability distribution function from spherical collapse: Early Dark Energy (EDE) vs. $Λ$CDM | We compute the one-point PDF of an initially Gaussian dark matter density
field using spherical collapse (SC). We compare the results to other forms
available in the literature and also compare the PDFs in the $\Lambda$CDM model
with an early dark energy (EDE) model. We find that the skewed log-normal
distribution prov... | 1910.14347v3 |
2019-11-04 | Planet-disk interaction in disks with cooling: basic theory | Gravitational coupling between young planets and their parent disks is often
explored using numerical simulations, which typically treat the disk
thermodynamics in a highly simplified manner. In particular, many studies adopt
the locally isothermal approximation, in which the disk temperature is a fixed
function of the... | 1911.01428v2 |
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 |
2019-11-29 | Convection-dominated dissolution for single and multiple immersed sessile droplets | We numerically investigate both single and multiple droplet dissolution with
droplets consisting of lighter liquid dissolving in a denser host liquid. The
significance of buoyancy is quantified by the Rayleigh number Ra which is the
buoyancy force over the viscous damping force. In this study, Ra spans almost
four deca... | 1911.13040v1 |
2020-02-26 | The Magnetized Vlasov-Ampère system and the Bernstein-Landau paradox | We study the Bernstein-Landau paradox in the collisionless motion of an
electrostatic plasma in the presence of a constant external magnetic field. The
Bernstein-Landau paradox consists in that in the presence of the magnetic
field, the electric field and the charge density fluctuation have an
oscillatory behavior in t... | 2002.11380v3 |
2020-07-24 | Convective turbulent viscosity acting on equilibrium tidal flows: new frequency scaling of the effective viscosity | Turbulent convection is thought to act as an effective viscosity ($\nu_E$) in
damping tidal flows in stars and giant planets. However, the efficiency of this
mechanism has long been debated, particularly in the regime of fast tides, when
the tidal frequency ($\omega$) exceeds the turnover frequency of the dominant
conv... | 2007.12624v1 |
2020-10-05 | Cryogenic suspension design for a kilometer-scale gravitational-wave detector | We report the mirror suspension design for Large-scale Cryogenic
Gravitational wave Telescope, KAGRA, during bKAGRA Phase 1. Mirror thermal
noise is one of the fundamental noises for room-temperature gravitational-wave
detectors such as Advanced LIGO and Advanced Virgo. Thus, reduction of thermal
noise is required for ... | 2010.01889v2 |
2021-01-21 | A Gauss-Seidel projection method with the minimal number of updates for stray field in micromagnetic simulations | Magnetization dynamics in magnetic materials is often modeled by the
Landau-Lifshitz equation, which is solved numerically in general. In
micromagnetic simulations, the computational cost relies heavily on the
time-marching scheme and the evaluation of stray field. Explicit marching
schemes are efficient but suffer fro... | 2101.08574v1 |
2021-01-29 | Radiative Poincare type eon and its follower | We consider two consecutive eons $\hat{M}$ and $\check{M}$ from Penrose's
Conformal Cyclic Cosmology and study how the matter content of the past eon
($\hat{M}$) determines the matter content of the present eon ($\check{M}$) by
means of the reciprocity hypothesis. We assume that the only matter content in
the final sta... | 2101.12670v2 |
2021-03-24 | Magnetism and Spin Dynamics in Room-Temperature van der Waals Magnet Fe$_5$GeTe$_2$ | Two-dimensional (2D) van der Waals (vdWs) materials have gathered a lot of
attention recently. However, the majority of these materials have Curie
temperatures that are well below room temperature, making it challenging to
incorporate them into device applications. In this work, we synthesized a
room-temperature vdW ma... | 2103.13433v2 |
2021-07-25 | High-overtone fits to numerical relativity ringdowns: beyond the dismissed n=8 special tone | In general relativity, the remnant object originating from an uncharged black
hole merger is a Kerr black hole. The approach to this final state is reached
through the emission of a late train of radiation known as the black hole
ringdown. The ringdown morphology is described by a countably infinite set of
damped sinus... | 2107.11829v2 |
2021-12-23 | Real-time methods for spectral functions | In this paper we develop and compare different real-time methods to calculate
spectral functions. These are classical-statistical simulations, the Gaussian
state approximation (GSA), and the functional renormalization group (FRG)
formulated on the Keldysh closed-time path. Our test-bed system is the quartic
anharmonic ... | 2112.12568v3 |
2022-01-03 | Exact scalar (quasi-)normal modes of black holes and solitons in gauged SUGRA | In this paper we identify a new family of black holes and solitons that lead
to the exact integration of scalar probes, even in the presence of a
non-minimal coupling with the Ricci scalar which has a non-trivial profile. The
backgrounds are planar and spherical black holes as well as solitons of
$SU\left( 2\right) \ti... | 2201.00438v1 |
2022-06-02 | Axion dark matter from frictional misalignment | We study the impact of sphaleron-induced thermal friction on the axion
dark-matter abundance due to the interaction of an axion-like particle (ALP)
with a dark non-abelian gauge sector in a secluded thermal bath. Thermal
friction can either enhance the axion relic density by delaying the onset of
oscillations or suppre... | 2206.01129v3 |
2022-06-11 | Field evolution of magnetic phases and spin dynamics in the honeycomb lattice magnet Na2Co2TeO6: 23Na NMR study | We report on the results of 23Na NMR in the honeycomb lattice magnet
Na2Co2TeO6 which has been nominated as a Kitaev material. Measurements of
magnetic shift and width of the NMR line as functions of temperature and
magnetic field show that a spin-disordered phase does not appear up to a field
of 9 T. In the antiferrom... | 2206.05409v3 |
2022-07-05 | Emergence of a new HI 21-cm absorption component at z~1.1726 towards the gamma-ray blazar PKS~2355-106 | We report the emergence of a new HI 21-cm absorption at z_abs = 1.172635 in
the damped Lyman-alpha absorber (DLA) towards the gamma-ray blazar PKS 2355-106
(z_em~1.639) using science verification observations (June 2020) from the
MeerKAT Absorption Line Survey (MALS). Since 2006, this DLA is known to show a
narrow HI 2... | 2207.01807v1 |
2022-07-29 | Global spherically symmetric solutions to degenerate compressible Navier-Stokes equations with large data and far field vacuum | We consider the initial-boundary value problem (IBVP) for the isentropic
compressible Navier-Stokes equations (\textbf{CNS}) in the domain exterior to a
ball in $\mathbb R^d$ $(d=2\ \text{or} \ 3)$. When viscosity coefficients are
given as a constant multiple of the mass density $\rho$, based on some analysis
of the no... | 2207.14494v1 |
2022-10-13 | The Planck clusters in the LOFAR sky. III. LoTSS-DR2: Dynamic states and density fluctuations of the intracluster medium | The footprint of LoTSS-DR2 covers 309 PSZ2 galaxy clusters, 83 of which host
a radio halo and 26 host a radio relic(s). It provides us an excellent
opportunity to statistically study the properties of extended cluster radio
sources, especially their connection with merging activities. We aim to
quantify cluster dynamic... | 2210.07284v1 |
2022-11-03 | Skyrmion Jellyfish in Driven Chiral Magnets | Chiral magnets can host topological particles known as skyrmions, which carry
an exactly quantised topological charge $Q=-1$. In the presence of an
oscillating magnetic field ${\bf B}_1(t)$, a single skyrmion embedded in a
ferromagnetic background will start to move with constant velocity ${\bf
v}_{\text{trans}}$. The ... | 2211.01714v5 |
2022-12-12 | Modified propagation of gravitational waves from the early radiation era | We study the propagation of cosmological gravitational wave (GW) backgrounds
from the early radiation era until the present day in modified theories of
gravity. Comparing to general relativity (GR), we study the effects that
modified gravity parameters, such as the GW friction $\alpha_{\rm M}$ and the
tensor speed exce... | 2212.06082v3 |
2023-02-01 | Post-dynamical inspiral phase of common envelope evolution: Binary orbit evolution and angular momentum transport | After the companion dynamically plunges through the primary's envelope, the
two cores remain surrounded by a common envelope and the decrease of the
orbital period $P_\text{orb}$ stalls. The subsequent evolution has never been
systematically explored with multidimensional simulations. For this study, we
performed 3D hy... | 2302.00691v2 |
2023-04-05 | Threshold current of field-free perpendicular magnetization switching using anomalous spin-orbit torque | Spin-orbit torque (SOT) is a candidate technique in next generation magnetic
random-access memory (MRAM). Recently, experiments show that some material with
low-symmetric crystalline or magnetic structures can generate anomalous SOT
that has an out-of-plane component, which is crucial in switching perpendicular
magneti... | 2304.02248v2 |
2023-04-24 | Magnetic levitation by rotation | A permanent magnet can be levitated simply by placing it in the vicinity of
another permanent magnet that rotates in the order of 200 Hz. This surprising
effect can be easily reproduced in the lab with off-the-shelf components. Here
we investigate this novel type of magnetic levitation experimentally and
clarify the un... | 2305.00812v3 |
2023-07-26 | Formulation and Implementation of Frequency-Dependent Linear Response Properties with Relativistic Coupled Cluster Theory for GPU-accelerated Computer Architectures | We present the development and implementation of the relativistic coupled
cluster linear response theory (CC-LR) which allows the determination of
molecular properties arising from time-dependent or time-independent electric,
magnetic, or mixed electric-magnetic perturbations (within a common gauge
origin), and take in... | 2307.14296v2 |
2023-09-22 | Challenges in Quasinormal Mode Extraction: Perspectives from Numerical solutions to the Teukolsky Equation | The intricacies of black hole ringdown analysis are amplified by the absence
of a complete set of orthogonal basis functions for quasinormal modes. Although
damped sinusoids effectively fit the ringdown signals from binary black hole
mergers, the risk of overfitting remains, due to initial transients and
nonlinear effe... | 2309.13204v3 |
2023-09-25 | Influence of density and viscosity on deformation, breakage, and coalescence of bubbles in turbulence | We investigate the effect of density and viscosity differences on a swarm of
large and deformable bubbles dispersed in a turbulent channel flow. For a given
shear Reynolds number, Re=300, and a constant bubble volume fraction, Phi=5.4%,
we perform a campaign of direct numerical simulations of turbulence coupled
with a ... | 2309.13995v1 |
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