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2015-11-25 | A Proposal of a Damping Term for the Relativistic Euler Equations | We introduce a damping term for the special relativistic Euler equations in
$3$-D and show that the equations reduce to the non-relativistic damped Euler
equations in the Newtonian limit. We then write the equations as a symmetric
hyperbolic system for which local-in-time existence of smooth solutions can be
shown. | 1511.08183v1 |
2016-01-27 | Concatenated Codes for Amplitude Damping | We discuss a method to construct quantum codes correcting amplitude damping
errors via code concatenation. The inner codes are chosen as asymmetric
Calderbank-Shor-Steane (CSS) codes. By concatenating with outer codes
correcting symmetric errors, many new codes with good parameters are found,
which are better than the ... | 1601.07423v1 |
2016-03-29 | Generalized damped Milne-Pinney equation and Chiellini method | We adopt the Chiellini integrability method to find the solutions of various
generalizations of the damped Milne-Pinney equations. In particular, we find
the solution of the damped Ermakov-Painlev\'e II equation and generalized
dissipative Milne-Pinney equation. | 1603.08747v2 |
2017-12-07 | Damped wave equations on compact hyperbolic surfaces | We prove exponential decay of energy for solutions of the damped wave
equation on compact hyperbolic surfaces with regular initial data as long as
the damping is nontrivial. The proof is based on a similar strategy as in
Dyatlov-Jin and in particular, uses the fractal uncertainty principle proved in
Bourgain-Dyatlov. | 1712.02692v1 |
2018-03-20 | Stability of the wave equations on a tree with local Kelvin-Voigt damping | In this paper we study the stability problem of a tree of elastic strings
with local Kelvin-Voigt damping on some of the edges. Under the compatibility
condition of displacement and strain and continuity condition of damping
coefficients at the vertices of the tree, exponential/polynomial stability are
proved. | 1803.07280v1 |
2018-09-10 | Logarithmic Decay of a Wave Equation with Kelvin-Voigt Damping | In this paper we analyze the long time behavior of a wave equation with local
Kelvin-Voigt Damping. Through introducing proper class symbol and
pseudo-differential calculus, we obtain a Carleman estimate, and then establish
an estimate on the corresponding resolvent operator. As a result, we show the
logarithmic decay ... | 1809.03196v1 |
2018-11-07 | Slow-dissipation limit of the harmonic oscillator with general power-law damping | An approximate solution is presented for simple harmonic motion in the
presence of damping by a force which is a general power-law function of the
velocity. The approximation is shown to be quite robust, allowing for a simple
way to investigate amplitude decay in the presence of general types of weak,
nonlinear damping... | 1811.02953v2 |
2019-09-25 | Forced Coupled Duffing Oscillators with Nonlinear Damping: Resonance and Antiresonance | In this work, we investigate resonance and antiresonance behaviour in forced
coupled Duffing oscillators with nonlinear damping. Further, we will analyse
the parameter dependence of the frequency response and stability. In the course
of all the analysis, emphasis shall be on how different damping mechanisms
contrast ag... | 1909.11390v1 |
2020-04-21 | Damping rate limitations for transverse dampers in large hadron colliders | The paper focuses on two issues important for design and operation of
bunch-by-bunch transverse damper in a very large hadron collider, where fast
damping is required to suppress beam instabilities and noise induced emittance
growth. The first issue is associated with kick variation along a bunch which
affects the damp... | 2004.10249v2 |
2021-08-17 | Spectral enclosures for the damped elastic wave equation | In this paper we investigate spectral properties of the damped elastic wave
equation. Deducing a correspondence between the eigenvalue problem of this
model and the one of Lam\'e operators with non self-adjoint perturbations, we
provide quantitative bounds on the location of the point spectrum in terms of
suitable norm... | 2108.07676v1 |
2022-02-10 | Stochastic optimal control for nonlinear damped network dynamics | We present a stochastic optimal control problem for a tree network. The
dynamics of the network are governed by transport equations with a special
emphasis on the non-linear damping function. Demand profiles at the network
sinks are modelled by a stochastic differential equations. An explicit optimal
inflow into the ne... | 2202.05114v1 |
2022-03-03 | Conformal symmetry in damped Pais-Uhlenbeck oscillator | Two Lagrangian formulations for describing of the damped harmonic oscillator
have been introduced by Bateman. For these models we construct higher
derivative generalization which enjoys the l-conformal Newton-Hooke symmetry.
The dynamics of generalized systems corresponds to the damped Pais-Uhlenbeck
oscillator for a p... | 2203.01651v1 |
2022-05-26 | Ergodic results for the stochastic nonlinear Schrödinger equation with large damping | We study the nonlinear Schr\"odinger equation with linear damping, i.e. a
zero order dissipation, and additive noise. Working in $R^d$ with d = 2 or d =
3, we prove the uniqueness of the invariant measure when the damping
coefficient is sufficiently large. | 2205.13364v1 |
2022-10-31 | An adaptive damped Newton method for strongly monotone and Lipschitz continuous operator equations | We will consider the damped Newton method for strongly monotone and Lipschitz
continuous operator equations in a variational setting. We will provide a very
accessible justification why the undamped Newton method performs better than
its damped counterparts in a vicinity of a solution. Moreover, in the given
setting, a... | 2210.17107v1 |
2022-11-19 | Blow up and lifespan estimates for systems of semi-linear wave equations with damping and potential | In this paper, we consider the semi-linear wave systems with
power-nonlinearities and a large class of space-dependent damping and
potential. We obtain the same blow-up regions and the lifespan estimates for
three types wave systems, compared with the systems without damping and
potential. | 2211.10639v1 |
2023-08-10 | Pathwise uniqueness for stochastic heat and damped equations with Hölder continuous drift | In this paper, we prove pathwise uniqueness for stochastic differential
equations in infinite dimension. Under our assumptions, we are able to consider
the stochastic heat equation up to dimension $3$, the stochastic damped wave
equation in dimension $1$ and the stochastic Euler-Bernoulli damped beam
equation up to dim... | 2308.05415v1 |
2023-10-30 | Beliaev damping in Bose gas | According to the Bogoliubov theory the low energy behaviour of the Bose gas
at zero temperature can be described by non-interacting bosonic quasiparticles
called phonons. In this work the damping rate of phonons at low momenta, the
so-called Beliaev damping, is explained and computed with simple arguments
involving the... | 2310.20070v1 |
2023-11-25 | Energy scattering for the unsteady damped nonlinear Schrodinger equation | We investigate the large time behavior of the solutions to the nonlinear
focusing Schr\"odinger equation with a time-dependent damping in the energy
sub-critical regime. Under non classical assumptions on the unsteady damping
term, we prove some scattering results in the energy space. | 2311.14980v2 |
1995-03-13 | Tidal Excitation of Modes in Binary Systems with Applications to Binary Pulsars | We consider the tidal excitation of modes in a binary system of arbitrary
eccentricity. For a circular orbit, the modes generally undergo forced
oscillation with a period equal to the orbital period ($T$). For an eccentric
orbit, the amplitude of each tidally excited mode can be written approximately
as the sum of an o... | 9503053v1 |
1997-09-05 | The Formation of Cosmic Structures in a Light Gravitino Dominated Universe | We analyse the formation of cosmic structures in models where the dark matter
is dominated by light gravitinos with mass of $ 100$ eV -- 1 keV, as predicted
by gauge-mediated supersymmetry (SUSY) breaking models. After evaluating the
number of degrees of freedom at the gravitinos decoupling ($g_*$), we compute
the tran... | 9709047v1 |
1998-01-05 | Calculation of the Ostriker-Vishniac Effect in Cold Dark Matter Models | We present a new derivation of the cosmic microwave background anisotropy
spectrum from the Ostriker-Vishniac effect for an open, flat, or closed
Universe, and calculate the anisotropy expected in cold dark-matter (CDM)
models. We provide simple semi-analytic fitting formulas for the Vishniac power
spectrum that can be... | 9801022v3 |
1999-06-08 | Constrained Violent Relaxation to a Spherical Halo | Violent relaxation during the collapse of a galaxy halo is known to be
incomplete in realistic cases such as cosmological infall or mergers. We adopt
a physical picture of strong but short lived interactions between potential
fluctuations and particle orbits, using the broad framework outlined by
Tremaine (1987) for in... | 9906133v1 |
2000-02-21 | Star Formation and Chemical Evolution of Lyman-Break Galaxies | The number density and clustering properties of Lyman-break galaxies (LBGs)
observed at redshift $z\sim 3$ are best explained by assuming that they are
associated with the most massive haloes at $z\sim 3$ predicted in hierarchical
models of structure formation. In this paper we study, under the same
assumption, how sta... | 0002388v1 |
2000-03-12 | Gravity-Modes in ZZ Ceti Stars: IV. Amplitude Saturation by Parametric Instability | ZZ Ceti stars exhibit small amplitude photometric pulsations in multiple
gravity-modes. We demonstrate that parametric instability, a form of resonant
3-mode coupling, limits overstable modes to amplitudes similar to those
observed. In particular, it reproduces the observed trend that longer period
modes have larger am... | 0003163v1 |
2000-10-18 | Magnetic Helicity Conservation and Astrophysical Dynamos | We construct a magnetic helicity conserving dynamo theory which incorporates
a calculated magnetic helicity current. In this model the fluid helicity plays
a small role in large scale magnetic field generation. Instead, the dynamo
process is dominated by a new quantity, derived from asymmetries in the second
derivative... | 0010373v2 |
2001-01-12 | The Scaling of the Redshift Power Spectrum: Observations from the Las Campanas Redshift Survey | In a recent paper we have studied the redshift power spectrum $P^S(k,\mu)$ in
three CDM models with the help of high resolution simulations. Here we apply
the method to the largest available redshift survey, the Las Campanas Redshift
Survey (LCRS). The basic model is to express $P^S(k,\mu)$ as a product of three
factor... | 0101211v2 |
2002-07-15 | Atomic data for the K-vacancy states of Fe XXIV | As part of a project to compute improved atomic data for the spectral
modeling of iron K lines, we report extensive calculations and comparisons of
atomic data for K-vacancy states in Fe XXIV. The data sets include: (i) energy
levels, line wavelengths, radiative and Auger rates; (ii) inner-shell electron
impact excitat... | 0207323v2 |
2002-12-17 | Probing the Friedmann equation during recombination with future CMB experiments | We show that by combining measurements of the temperature and polarization
anisotropies of the Cosmic Microwave Background (CMB), future experiments will
tightly constrain the expansion rate of the universe during recombination. A
change in the expansion rate modifies the way in which the recombination of
hydrogen proc... | 0212360v2 |
2003-10-08 | The Sizes and Kinematic Structure of Absorption Systems Towards the Lensed Quasar APM08279+5255 | We have obtained spatially resolved spectra of the z=3.911 triply imaged QSO
APM08279+5255 using the Space Telescope Imaging Spectrograph (STIS) on board
the Hubble Space Telescope (HST). We study the line of sight equivalent width
(EW) differences and velocity shear of high and low ionization absorbers
(including a da... | 0310221v1 |
2004-05-11 | Photoionization Modeling and the K Lines of Iron | We calculate the efficiency of iron K line emission and iron K absorption in
photoionized models using a new set of atomic data. These data are more
comprehensive than those previously applied to the modeling of iron K lines
from photoionized gases, and allow us to systematically examine the behavior of
the properties ... | 0405210v1 |
2005-05-23 | Damped Lyman Alpha Surveys and Statistics - A Review | The history and progress of DLA research over the past several decades is
reviewed here. Larger datasets and deeper surveys, particularly over the last
couple of years, have improved our knowledge of the neutral gas content and
distribution in the universe at all observable redshifts, including the present
epoch. New r... | 0505479v1 |
2005-06-28 | The Metallicity - Kinematics Relation in Large-N(HI) Absorbers | Sloan Digital Sky Survey (SDSS) quasar spectroscopy is yielding a database of
strong low-ionization MgII absorbers over the redshift interval 0.36<z<2.28
which is over two orders of magnitude larger than anything previously
assembled. HST UV spectroscopy has been used to measure neutral hydrogen column
densities for a ... | 0506701v1 |
2006-11-28 | Detecting cold gas at intermediate redshifts: GMRT survey using Mg II systems | Intervening HI 21-cm absorption systems at z > 1.0 are very rare and only 4
confirmed detections have been reported in the literature. Despite their
scarcity, they provide interesting and unique insights into the physical
conditions in the interstellar medium of high-z galaxies. Moreover, they can
provide independent c... | 0611836v1 |
1998-10-01 | Finite temperature dynamics of vortices in the two dimensional anisotropic Heisenberg model | We study the effects of finite temperature on the dynamics of non-planar
vortices in the classical, two-dimensional anisotropic Heisenberg model with
XY- or easy-plane symmetry. To this end, we analyze a generalized
Landau-Lifshitz equation including additive white noise and Gilbert damping.
Using a collective variable... | 9810011v1 |
2001-02-09 | The influence of the oscillations of the chemical potential on the de Haas - van Alphen effect in quasi-two-dimensional compounds | The de Haas - van Alphen effect in quasi-two-dimensional metals is studied at
arbitrary parameters. The oscillations of the chemical potential may
substantially change the temperature dependence of harmonic amplitudes that is
usually used to determine the effective electron mass. Hence, the processing of
the experiment... | 0102177v1 |
2003-11-11 | Ornstein-Zernike equation and Percus-Yevick theory for molecular crystals | We derive the Ornstein-Zernike equation for molecular crystals of axially
symmetric particles and apply the Percus-Yevick approximation to this system.
The one-particle orientational distribution function has a nontrivial
dependence on the orientation and is needed as an input. Despite some
differences, the Ornstein-Ze... | 0311253v1 |
2004-07-12 | Microwave-induced flow of vortices in long Josephson junctions | We report experimental and numerical study of microwave-induced flow of
vortices in long Josephson junctions at zero dc magnetic field. Our intriguing
observation is that applying an ac-bias of a small frequency $f \ll f_p $ and
sufficiently large amplitude changes the current-voltage characteristics
($I$-$V$ curve) of... | 0407290v1 |
2005-07-29 | Frustrated two-level impurities in two-dimensional antiferromagnets | Dynamical properties of the impurity spin-$\frac12$ in 2D and quasi-2D
Heisenberg antiferromagnets (AFs) at $T\ge0$ are discussed. The specific case
of an impurity coupled symmetrically to two neighboring host spins is
considered. The specific feature of this problem is that the defect is
degenerate (frustrated) being ... | 0507704v2 |
2006-10-11 | Miscibility in a degenerate fermionic mixture induced by linear coupling | We consider a one-dimensional mean-field-hydrodynamic model of a
two-component degenerate Fermi gas in an external trap, each component
representing a spin state of the same atom. We demonstrate that the
interconversion between them (linear coupling), imposed by a resonant
electromagnetic wave, transforms the immiscibl... | 0610317v1 |
2002-03-12 | Gravitational Waves from the Merger of Binary Neutron Stars in a Fully General Relativistic Simulation | We performed 3D numerical simulations of the merger of equal-mass binary
neutron stars in full general relativity using a new large scale supercomputer.
We take the typical grid size as (505,505,253) for (x,y,z) and the maximum grid
size as (633,633,317). These grid numbers enable us to put the outer boundaries
of the ... | 0203037v1 |
2002-06-20 | Gravitational Radiation Damping and the Three-Body Problem | A model of three-body motion is developed which includes the effects of
gravitational radiation reaction. The radiation reaction due to the emission of
gravitational waves is the only post-Newtonian effect that is included here.
For simplicity, all of the motion is taken to be planar. Two of the masses are
viewed as a ... | 0206059v2 |
1997-10-15 | Domain Walls Out of Equilibrium | We study the non-equilibrium dynamics of domain walls in real time for
$\phi^4$ and Sine Gordon models in 1+1 dimensions in the dilute regime. The
equation of motion for the collective coordinate is obtained by integrating out
the meson excitations around the domain wall to one-loop order. The real-time
non-equilibrium... | 9710359v2 |
2000-07-18 | Further studies on relic neutrino asymmetry generation I: the adiabatic Boltzmann limit, non-adiabatic evolution, and the classical harmonic oscillator analogue of the quantum kinetic equations | We demonstrate that the relic neutrino asymmetry evolution equation derived
from the quantum kinetic equations (QKEs) reduces to the Boltzmann limit that
is dependent only on the instantaneous neutrino number densities, in the
adiabatic limit in conjunction with sufficient damping. An original physical
and/or geometric... | 0007185v3 |
2002-09-27 | Lorentz-Invariant Non-Commutative QED | Lorentz-invariant non-commutative QED (NCQED) is constructed such that it
should be a part of Lorentz-invariant non-commutative standard model (NCSM), a
subject to be treated in later publications. Our NCSM is based on Connes'
observation that the total fermion field in the standard model may be regarded
as a bi-module... | 0209234v2 |
2005-11-12 | Elliptic Curves, Algebraic Geometry Approach in Gravity Theory and Some Applications in Theories with Extra Dimensions I | Motivated by the necessity to find exact solutions with the elliptic
Weierstrass function of the Einstein's equations (see gr-qc/0105022),the
present paper develops further the proposed approach in hep-th/0107231,
concerning the s.c. cubic algebraic equation for effective parametrization.
Obtaining an ''embedded'' sequ... | 0511136v1 |
2002-04-11 | High-fidelity teleportation of entanglements of running-wave field states | We describe a scheme for the teleportation of entanglements of zero- and
one-photon running-wave field states. In addition to linear optical elements,
Kerr nonlinearity is also employed so as to achieve a 100% probability of
success in the ideal case. A comprehensive phenomenological treatment of errors
in the domain o... | 0204057v2 |
2007-04-25 | Zakharov simulation study of spectral features of on-demand Langmuir turbulence in an inhomogeneous plasma | We have performed a simulation study of Langmuir turbulence in the Earth's
ionosphere by means of a Zakharov model with parameters relevant for the F
layer. The model includes dissipative terms to model collisions and Landau
damping of the electrons and ions, and a linear density profile, which models
the ionospheric p... | 0704.3419v2 |
2007-06-04 | Quantum theory of exciton-photon coupling in photonic crystal slabs with embedded quantum wells | A theoretical description of radiation-matter coupling for
semiconductor-based photonic crystal slabs is presented, in which quantum wells
are embedded within the waveguide core layer. A full quantum theory is
developed, by quantizing both the electromagnetic field with a spatial
modulation of the refractive index and ... | 0706.0396v1 |
2007-06-05 | Strong field effects on binary systems in Einstein-aether theory | "Einstein-aether" theory is a generally covariant theory of gravity
containing a dynamical preferred frame. This article continues an examination
of effects on the motion of binary pulsar systems in this theory, by
incorporating effects due to strong fields in the vicinity of neutron star
pulsars. These effects are inc... | 0706.0704v2 |
2007-07-19 | Structure formation in the presence of dark energy perturbations | We study non-linear structure formation in the presence of dark energy. The
influence of dark energy on the growth of large-scale cosmological structures
is exerted both through its background effect on the expansion rate, and
through its perturbations as well. In order to compute the rate of formation of
massive objec... | 0707.2882v3 |
2007-07-25 | Chromoelectric response functions for quark-gluon plasma | We determine the chromoelectric response of quark-gluon plasma (QGP)
systematically within the framework of classical transport equations. The
transport equations are set up in the phase space which includes the SU(3)
group space corresponding to color (which is a dynamical degree of freedom), in
addition to the positi... | 0707.3697v3 |
2007-07-26 | Coarse-Grained Finite-Temperature Theory for the Condensate in Optical Lattices | In this work, we derive a coarse-grained finite-temperature theory for a Bose
condensate in a one-dimensional optical lattice, in addition to a confining
harmonic trap potential. We start from a two-particle irreducible (2PI)
effective action on the Schwinger-Keldysh closed-time contour path. In
principle, this action ... | 0707.3984v1 |
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 |
2007-10-16 | A generalization of Snoek's law to ferromagnetic films and composites | The present paper establishes characteristics of the relative magnetic
permeability spectrum $\mu$(f) of magnetic materials at microwave frequencies.
The integral of the imaginary part of $\mu$(f) multiplied with the frequency f
gives remarkable properties. A generalisation of Snoek's law consists in this
quantity bein... | 0710.2980v2 |
2007-11-28 | Scalar Casimir Effect on a D-dimensional Einstein Static Universe | We compute the renormalised energy momentum tensor of a free scalar field
coupled to gravity on an (n+1)-dimensional Einstein Static Universe (ESU),
RxS^n, with arbitrary low energy effective operators (up to mass dimension
n+1). A generic class of regulators is used, together with the Abel-Plana
formula, leading to a ... | 0711.4564v2 |
2008-01-04 | Study of the preheating phase of chaotic inflation | Particle production and its effects on the inflaton field are investigated
during the preheating phase of chaotic inflation using a model consisting of a
massive scalar inflaton field coupled to N massless quantum scalar fields. The
effects of spacetime curvature and interactions between the quantum fields are
ignored.... | 0801.0730v3 |
2008-01-07 | Collective plasmonic modes of metal nano-particles in two-dimensional periodic regular arrays | We investigate the collective plasmonic modes of metal nano-particles in
periodic two-dimensional (2D) arrays within a point-dipole description. As an
open system, the full-dynamic dispersion relations of the 2D arrays are
obtained through an efficient method which gives an effective polarizability
describing the colle... | 0801.0906v1 |
2008-01-28 | Doebner-Goldin Equation for Electrodynamic Particle. The Implied Applications | We set up the Maxwell's equations and the corresponding classical wave
equations for the electromagnetic waves which together with the generating
source, a traveling oscillatory charge of zero rest mass, comprise a particle
traveling in the force field of an usual conservative potential and an
additional frictional for... | 0801.4279v2 |
2008-03-17 | Fermionic Casimir effect in toroidally compactified de Sitter spacetime | We investigate the fermionic condensate and the vacuum expectation values of
the energy-momentum tensor for a massive spinor field in de Sitter spacetime
with spatial topology $\mathrm{R}^{p}\times (\mathrm{S}^{1})^{q}$. Both cases
of periodicity and antiperiodicity conditions along the compactified dimensions
are cons... | 0803.2413v1 |
2008-03-27 | Towards Understanding the Mass-Metallicity relation of Quasar Absorbers: Evidence for bimodality and consequences | One way to characterize and understand HI-selected galaxies is to study their
metallicity properties. In particular, we show that the metallicity of
absorbers is a bivariate function of the HI column density (NHI) and the MgII
equivalent width (Wr(2796)). Thus, a selection upon Wr(2796) is not equivalent
to a HI select... | 0803.3944v3 |
2008-04-21 | Precision calculations of the gravitational wave background spectrum from inflation | The spectrum of the gravitational wave background originating from quantum
fluctuations during inflation is calculated numerically for various inflation
models over a wide range of frequencies. We take into account four ingredients
: the scalar field dynamics during inflation making no use of the slow-roll
approximatio... | 0804.3249v3 |
2008-04-21 | Gravitational Instability in Radiation Pressure Dominated Backgrounds | I consider the physics of gravitational instabilities in the presence of
dynamically important radiation pressure and gray radiative diffusion, governed
by a constant opacity, kappa. For any non-zero radiation diffusion rate on an
optically-thick scale, the medium is unstable unless the classical gas-only
isothermal Je... | 0804.3403v1 |
2008-04-26 | Spatial Periodicity of Galaxy Number Counts, CMB Anisotropy, and SNIa Hubble Diagram Based on the Universe Accompanied by a Non-Minimally Coupled Scalar Field | We have succeeded in establishing a cosmological model with a non-minimally
coupled scalar field $\phi$ that can account not only for the spatial
periodicity or the {\it picket-fence structure} exhibited by the galaxy $N$-$z$
relation of the 2dF survey but also for the spatial power spectrum of the
cosmic microwave bac... | 0804.4240v1 |
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 |
2009-02-25 | Propagating slow magnetoacoustic waves in coronal loops observed by Hinode/EIS | We present the first Hinode/EIS observations of 5 min quasi-periodic
oscillations detected in a transition-region line (He II) and five coronal
lines (Fe X, Fe XII, Fe XIII, Fe XIV, and Fe XV) at the footpoint of a coronal
loop. The oscillations exist throughout the whole observation, characterized by
a series of wave ... | 0902.4480v1 |
2009-04-22 | The Rotation of Janus and Epimetheus | Epimetheus, a small moon of Saturn, has a rotational libration (an
oscillation about synchronous rotation) of 5.9 +- 1.2 degrees, placing
Epimetheus in the company of Earth's Moon and Mars' Phobos as the only natural
satellites for which forced rotational libration has been detected. The forced
libration is caused by t... | 0904.3515v2 |
2009-09-18 | Stochastic Electron Acceleration in the TeV Supernova Remnant RX J1713.7-3946: The High-Energy Cut-off | In the leptonic scenario for TeV emission from a few well-observed shell-type
TeV supernova remnants (STTSNRs), very weak magnetic fields are inferred. If
fast-mode waves are produced efficiently in the shock downstream, we show that
they are viable agents for acceleration of relativistic electrons inferred from
the ob... | 0909.3349v2 |
2009-10-10 | The Electron Propagator in External Electromagnetic Fields in Lower Dimensions | We study the electron propagator in quantum electrodynamics in lower
dimensions. In the case of free electrons, it is well known that the propagator
in momentum space takes the simple form $S_F(p)=1/(\gamma\cdot p-m)$. In the
presence of external electromagnetic fields, electron asymptotic states are no
longer plane-wa... | 0910.1881v1 |
2009-10-12 | Effects on the two-point correlation function from the coupling of quintessence to dark matter | We investigate the effects of the nonminimal coupling between the scalar
field dark energy (quintessence) and the dark matter on the two- point
correlation function. It is well known that this coupling shifts the turnover
scale as well as suppresses the amplitude of the matter power spectrum.
However, these effects are... | 0910.2175v2 |
2009-11-10 | A Comparison between Two Simple Models of a Slug Flow in a Long Flexible Marine Riser | Slug flows are extremely interesting multiphase regime phenomena which
frequently occur in flexible marine risers used by the petroleum industry in
offshore environments and have both a liquid and gaseous phase. This paper
describes two simple models of the slug flow regime by means of an equivalent
monophase flow with... | 0911.1873v1 |
2009-11-13 | Two-resonator circuit QED: Dissipative Theory | We present a theoretical treatment for the dissipative two-resonator circuit
quantum electrodynamics setup referred to as quantum switch. There, switchable
coupling between two superconducting resonators is mediated by a
superconducting qubit operating in the dispersive regime, where the qubit
transition frequency is f... | 0911.2657v4 |
2009-12-02 | Eulerian and Lagrangian propagators for the adhesion model (Burgers dynamics) | Motivated by theoretical studies of gravitational clustering in the Universe,
we compute propagators (response functions) in the adhesion model. This model,
which is able to reproduce the skeleton of the cosmic web and includes
nonlinear effects in both Eulerian and Lagrangian frameworks, also corresponds
to the Burger... | 0912.0356v1 |
2010-02-18 | Average luminosity distance in inhomogeneous universes | Using numerical ray tracing, the paper studies how the average distance
modulus in an inhomogeneous universe differs from its homogeneous counterpart.
The averaging is over all directions from a fixed observer not over all
possible observers (cosmic), thus it is more directly applicable to our
observations. Unlike prev... | 1002.3408v1 |
2010-05-25 | Structural, static and dynamic magnetic properties of CoMnGe thin films on a sapphire a-plane substrate | Magnetic properties of CoMnGe thin films of different thicknesses (13, 34,
55, 83, 100 and 200 nm), grown by RF sputtering at 400{\deg}C on single crystal
sapphire substrates, were studied using vibrating sample magnetometry (VSM) and
conventional or micro-strip line (MS) ferromagnetic resonance (FMR). Their
behavior i... | 1005.4595v3 |
2010-09-28 | Accurate interaction energies at DFT level by means of an efficient dispersion correction | This paper presents an approach for obtaining accurate interaction energies
at the DFT level for systems where dispersion interactions are important. This
approach combines Becke and Johnson's [J. Chem. Phys. 127, 154108 (2007)]
method for the evaluation of dispersion energy corrections and a Hirshfeld
method for parti... | 1009.5631v1 |
2010-11-17 | On the Critical Coupling for Kuramoto Oscillators | The Kuramoto model captures various synchronization phenomena in biological
and man-made systems of coupled oscillators. It is well-known that there exists
a critical coupling strength among the oscillators at which a phase transition
from incoherency to synchronization occurs. This paper features four
contributions. F... | 1011.3878v2 |
2011-01-04 | Universal Spin Transport in a Strongly Interacting Fermi Gas | Transport of fermions is central in many fields of physics. Electron
transport runs modern technology, defining states of matter such as
superconductors and insulators, and electron spin, rather than charge, is being
explored as a new carrier of information [1]. Neutrino transport energizes
supernova explosions followi... | 1101.0780v1 |
2011-02-02 | Galaxy N-z Relation and CMB Spectrum Based on Cosmological Model with Scalar Field Having Modified Potential Form | We have succeeded in establishing a cosmological model with a non-minimally
coupled scalar field $\phi$ that can account not only for the spatial
periodicity or the picket-fence structure exhibited by the galaxy $N$-$z$
relation of the 2dF survey, but also for the spatial power spectrum of the
cosmic microwave backgrou... | 1102.0341v1 |
2011-03-10 | Compressive high-frequency waves riding on an Alfvén/ion-cyclotron wave in a multi-fluid plasma | In this paper, we study the weakly-compressive high-frequency plasma waves
which are superposed on a large-amplitude Alfv\'en wave in a multi-fluid plasma
consisting of protons, electrons, and alpha particles. For these waves, the
plasma environment is inhomogenous due to the presence of the low-frequency
Alfv\'en wave... | 1103.2029v3 |
2011-03-17 | Phonon Spectra, Nearest Neighbors, and Mechanical Stability of Disordered Colloidal Clusters with Attractive Interactions | We investigate the influence of morphology and size on the vibrational
properties of disordered clusters of colloidal particles with attractive
interactions. From measurements of displacement correlations between particles
in each cluster, we extract vibrational properties of the corresponding
"shadow" glassy cluster, ... | 1103.3535v1 |
2011-06-15 | Chiral symmetry breaking in QCD-like gauge theories with a confining propagator and dynamical gauge boson mass generation | We study chiral symmetry breaking in QCD-like gauge theories introducing a
confining effective propagator, as proposed recently by Cornwall, and
considering the effect of dynamical gauge boson mass generation. The effective
confining propagator has the form $1/(k^2+m^2)^2$ and we study the bifurcation
equation finding ... | 1106.2860v3 |
2011-06-21 | Symmetry and the macroscopic dynamics of antiferromagnetic materials in the presence of spin-polarized current | Antiferromagnetic (AFM) materials with zero or vanishingly small macroscopic
magnetization are nowadays the constituent elements of spintronic devices.
However, possibility to use them as active elements that show nontrivial
controllable magnetic dynamics is still discussible. In the present paper we
extend the theory ... | 1106.4231v3 |
2011-07-05 | Black-hole hair loss: learning about binary progenitors from ringdown signals | Perturbed Kerr black holes emit gravitational radiation, which (for the
practical purposes of gravitational-wave astronomy) consists of a superposition
of damped sinusoids termed quasi-normal modes. The frequencies and
time-constants of the modes depend only on the mass and spin of the black hole
- a consequence of the... | 1107.0854v3 |
2011-08-01 | Symplectic integrators with adaptive time steps | In recent decades, there have been many attempts to construct symplectic
integrators with variable time steps, with rather disappointing results. In
this paper we identify the causes for this lack of performance, and find that
they fall into two categories. In the first, the time step is considered a
function of time a... | 1108.0322v1 |
2011-11-02 | Self-consistent size and velocity distributions of collisional cascades | The standard theoretical treatment of collisional cascades derives a
steady-state size distribution assuming a single constant velocity dispersion
for all bodies regardless of size. Here we relax this assumption and solve
self-consistently for the bodies' steady-state size and size-dependent velocity
distributions. Spe... | 1111.0667v1 |
2011-11-21 | Ultrasoft Fermionic Modes at High Temperature | A possible collective fermionic excitation in the ultrasoft energy-momentum
region is examined in Yukawa model with scalar coupling and quantum
electrodynamics (QED) with g being coupling constant at extremely high
temperature T where the fermion mass is negligible. We analytically sum up the
ladder diagrams for the ve... | 1111.5015v1 |
2011-12-05 | Chiral symmetry breaking with a confining propagator and dynamically massive gluons | Chiral symmetry breaking in QCD is studied introducing a confining effective
propagator, as proposed recently by Cornwall, and considering the effect of
dynamically massive gluons. The effective confining propagator has the form
$1/(k^2+m^2)^2$ and we study the bifurcation equation finding limits on the
parameter $m$ b... | 1112.0926v1 |
2012-01-03 | Hydrodynamic model for electron-hole plasma in graphene | We propose a hydrodynamic model describing steady-state and dynamic electron
and hole transport properties of graphene structures which accounts for the
features of the electron and hole spectra. It is intended for electron-hole
plasma in graphene characterized by high rate of intercarrier scattering
compared to extern... | 1201.0592v1 |
2012-07-02 | Establishing micromagnetic parameters of ferromagnetic semiconductor (Ga,Mn)As | (Ga,Mn)As is at the forefront of research exploring the synergy of magnetism
with the physics and technology of semiconductors, and has led to discoveries
of new spin-dependent phenomena and functionalities applicable to a wide range
of material systems. Its recognition and utility as an ideal model material for
spintr... | 1207.0310v1 |
2012-10-30 | Transverse kink oscillations in the presence of twist | Magnetic twist is thought to play an important role in coronal loops. The
effects of magnetic twist on stable magnetohydrodynamic (MHD) waves is poorly
understood because they are seldom studied for relevant cases. The goal of this
work is to study the fingerprints of magnetic twist on stable transverse kink
oscillatio... | 1210.8093v1 |
2013-02-07 | Scalar and fermionic vacuum currents in de Sitter spacetime with compact dimensions | Vacuum expectation values (VEVs) of the current densities for charged scalar
and Dirac spinor fields are investigated in (D+1)-dimensional de Sitter (dS)
spacetime with toroidally compactified spatial dimensions. Along compact
dimensions we impose quasiperiodicity conditions with arbitrary phases. In
addition, the pres... | 1302.1688v2 |
2013-04-17 | Theoretical characterization of excitation energy transfer in chlorosome light-harvesting antennae from green sulfur bacteria | Chlorosomes are the largest and most efficient natural light-harvesting
antenna systems. They contain thousands of pigment molecules -
bacteriochlorophylls (BChls)- that are organized into supramolecular aggregates
and form a very efficient network for excitonic energy migration. Here, we
present a theoretical study of... | 1304.4902v2 |
2013-07-12 | Study of Conduction Cooling Effects in Long Aspect Ratio Penning-Malmberg Micro-Traps | A first order perturbation with respect to velocity has been employed to find
the frictional damping force imposed on a single moving charge due to a
perturbative electric field, inside a long circular cylindrical trap. We find
that the electric field provides a cooling effect, has a tensorial relationship
with the vel... | 1307.3357v1 |
2013-07-17 | Analysis of the Taylor dissipation surrogate in forced isotropic turbulence | From the energy balance in wavenumber space expressed by the Lin equation, we
derive a new form for the local Karman-Howarth equation for forced isotropic
turbulence in real space. This equation is then cast into a dimensionless form,
from which a combined analytical and numerical study leads us to deduce a new
model f... | 1307.4574v1 |
2013-07-26 | The history force on a small particle in a linearly stratified fluid | The hydrodynamic force experienced by a small spherical particle undergoing
an arbitrary time-dependent motion in a density-stratified fluid is
investigated theoretically. The study is carried out under the
Oberbeck-Boussinesq approximation, and in the limit of small Reynolds and small
P\'eclet numbers. The force actin... | 1307.6934v2 |
2013-08-27 | Mechanical fluidity of fully suspended biological cells | Mechanical characteristics of single biological cells are used to identify
and possibly leverage interesting differences among cells or cell populations.
Fluidity---hysteresivity normalized to the extremes of an elastic solid or a
viscous liquid---can be extracted from, and compared among, multiple
rheological measurem... | 1308.6004v1 |
2013-09-11 | Numerical Boson Stars with a Single Killing Vector II: the D=3 Case | We complete the analysis of part I in this series (Ref.
\cite{Stotyn:2013yka}) by numerically constructing boson stars in 2+1
dimensional Einstein gravity with negative cosmological constant, minimally
coupled to a complex scalar field. These lower dimensional boson stars have
strikingly different properties than their... | 1309.2911v3 |
2013-11-13 | Convergent perturbative nuclear effective field theory | We consider the nuclear effective field theory including pions in the
two-nucleon sector in the S waves up to including the next-to-next-to-leading
order (NNLO) terms according to the power counting suggested by the Wilsonian
renormalization group analysis done in a previous paper. We treat only the
leading contact int... | 1311.3063v1 |
2013-11-14 | Electric field gradient wave (EFGW) in iron-based superconductor Ba(0.6)K(0.4)Fe2As2 studied by Mössbauer spectroscopy | The optimally doped 122 iron-based superconductor Ba(0.6)K(0.4)Fe2As2 has
been studied by 57Fe Moessbauer spectroscopy versus temperature ranging from
4.2 K till 300 K with particular attention paid to the superconducting
transition around 38 K. The spectra do not contain magnetic components and they
exhibit quasi-cont... | 1311.3503v4 |
2013-12-24 | Slow Light in Metamaterial Waveguides | Metamaterials, which are materials engineered to possess novel optical
properties, have been increasingly studied. The ability to fabricate
metamaterials has sparked an interest in determining possible applications. We
investigate using a metamaterial for boundary engineering in waveguides.
A metamaterial-clad cylind... | 1312.6892v1 |
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