publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2013-05-21 | Characterization and Synthesis of Rayleigh Damped Elastodynamic Networks | We consider damped elastodynamic networks where the damping matrix is assumed
to be a non-negative linear combination of the stiffness and mass matrices
(also known as Rayleigh or proportional damping). We give here a
characterization of the frequency response of such networks. We also answer the
synthesis question for... | 1305.4961v1 |
2016-08-08 | Damping Functions correct over-dissipation of the Smagorinsky Model | This paper studies the time-averaged energy dissipation rate $\langle
\varepsilon_{SMD} (u)\rangle$ for the combination of the Smagorinsky model and
damping function. The Smagorinsky model is well known to over-damp. One common
correction is to include damping functions that reduce the effects of model
viscosity near w... | 1608.02655v2 |
2015-02-26 | Efficient modelling of particle collisions using a non-linear viscoelastic contact force | In this paper the normal collision of spherical particles is investigated.
The particle interaction is modelled in a macroscopic way using the Hertzian
contact force with additional linear damping. The goal of the work is to
develop an efficient approximate solution of sufficient accuracy for this
problem which can be ... | 1502.07728v2 |
2018-12-10 | H$_2$/HD molecular data for analysis of quasar spectra in search of varying constants | Absorption lines of H$_2$ and HD molecules observed at high redshift in the
line of sight towards quasars are a test ground to search for variation of the
proton-to-electron mass ratio $\mu$. For this purpose, results from
astronomical observations are compared with a compilation of molecular data of
the highest accura... | 1812.03628v2 |
2019-12-24 | Modified Drude model for small gold nanoparticles surface plasmon resonance based on the role of classical confinement | We study the effect of restoration force caused by the limited size of a
small metallic nanoparticle (MNP) on its linear response to the electric field
of incident light. In a semi-classical phenomenological Drude-like model for
small MNP, we consider restoration force caused by the displacement of
conduction electrons... | 1912.11245v1 |
2022-01-03 | Solid-like to Liquid-like Behavior of Cu Diffusion in Superionic Cu2X (X=S, Se): An Inelastic Neutron Scattering and Ab-Initio Molecular Dynamics Investigation | Cu2Se and Cu2S are excellent model systems of superionic conductors with
large diffusion coefficients that have been reported to exhibit different
solid-liquid-like Cu-ion diffusion. In this paper, we clarify the atomic
dynamics of these compounds with temperature-dependent ab-initio molecular
dynamics (AIMD) simulatio... | 2201.00606v1 |
2024-02-22 | Laser patterning of magnonic structure via local crystallization of Yittrium Iron Garnet | The fabrication and integration of high-quality structures of Yttrium Iron
Garnet (YIG) is critical for magnonics.Films with excellent properties are
obtained only on single crystal Gadolinium Gallium Garnet (GGG) substrates
using high-temperature processes. The subsequent realization of magnonic
structures via lithogr... | 2402.14444v1 |
2024-03-07 | The stochastic Ravine accelerated gradient method with general extrapolation coefficients | In a real Hilbert space domain setting, we study the convergence properties
of the stochastic Ravine accelerated gradient method for convex differentiable
optimization. We consider the general form of this algorithm where the
extrapolation coefficients can vary with each iteration, and where the
evaluation of the gradi... | 2403.04860v2 |
2012-01-27 | Full and Half Gilbert Tessellations with Rectangular Cells | We investigate the ray-length distributions for two different rectangular
versions of Gilbert's tessellation. In the full rectangular version, lines
extend either horizontally (with east- and west-growing rays) or vertically
(north- and south-growing rays) from seed points which form a Poisson point
process, each ray s... | 1201.5780v1 |
2021-06-08 | On numerical aspects of parameter identification for the Landau-Lifshitz-Gilbert equation in Magnetic Particle Imaging | The Landau-Lifshitz-Gilbert equation yields a mathematical model to describe
the evolution of the magnetization of a magnetic material, particularly in
response to an external applied magnetic field. It allows one to take into
account various physical effects, such as the exchange within the magnetic
material itself. I... | 2106.07625v1 |
2021-01-28 | Fluid-elastic coefficients in single phase cross flow: dimensional analysis, direct and indirect experimental methods | The importance of fluid-elastic forces in tube bundle vibrations can hardly
be over-emphasized, in view of their damaging potential. In the last decades,
advanced models for representing fluid-elastic coupling have therefore been
developed by the community of the domain. Those models are nowadays embedded in
the method... | 2101.12021v1 |
2000-09-11 | Numerical Studies on Locally Damped Structures | In the JLC/NLC X-band linear collider, it is essential to reduce the
long-range dipole wakefields in the accelerator structure to prevent beam break
up (BBU) and emittance degradation. The two methods of reducing the long-range
wakefields are detuning and damping. Detuning reduces the wakefields rapidly as
the dipole m... | 0009039v1 |
2015-03-13 | A one-step optimal energy decay formula for indirectly nonlinearly damped hyperbolic systems coupled by velocities | In this paper, we consider the energy decay of a damped hyperbolic system of
wave-wave type which is coupled through the velocities. We are interested in
the asymptotic properties of the solutions of this system in the case of
indirect nonlinear damping, i.e. when only one equation is directly damped by a
nonlinear dam... | 1503.04126v1 |
2015-08-21 | Radiative damping in wave guide based FMR measured via analysis of perpendicular standing spin waves in sputtered Permalloy films | The damping $\alpha$ of the spinwave resonances in 75 nm, 120 nm, and 200nm
-thick Permalloy films is measured via vector-network-analyzer
ferromagnetic-resonance (VNA-FMR) in the out-of-plane geometry. Inductive
coupling between the sample and the waveguide leads to an additional radiative
damping term. The radiative ... | 1508.05265v1 |
2022-09-28 | Tunable nonlinear damping in parametric regime | Nonlinear damping plays a significant role in several area of physics and it
is becoming increasingly important to understand its underlying mechanism.
However, microscopic origin of nonlinear damping is still a debatable topic.
Here, we probe and report nonlinear damping in a highly tunable MoS2 nano
mechanical drum r... | 2209.14120v1 |
2005-11-07 | The Effects of Alfven Waves and Radiation Pressure in Dusty Winds of Late-Type Stars. II. Dust-Cyclotron Damping | There are in the literature several theories to explain the mass loss in
stellar winds. In particular, for late-type stars, some authors have proposed a
wind model driven by an outward-directed flux of damped Alfven waves. The winds
of these stars present great amounts of dust particles that, if charged, can
give rise ... | 0511192v2 |
2013-09-11 | Initial versus tangent stiffness-based Rayleigh damping in inelastic time history seismic analyses | In the inelastic time history analyses of structures in seismic motion, part
of the seismic energy that is imparted to the structure is absorbed by the
inelastic structural model, and Rayleigh damping is commonly used in practice
as an additional energy dissipation source. It has been acknowledged that
Rayleigh damping... | 1309.2741v1 |
2017-07-14 | Damping of gravitational waves by matter | We develop a unified description, via the Boltzmann equation, of damping of
gravitational waves by matter, incorporating collisions. We identify two
physically distinct damping mechanisms -- collisional and Landau damping. We
first consider damping in flat spacetime, and then generalize the results to
allow for cosmolo... | 1707.05192v2 |
2003-04-10 | Electron-Ion Recombination Rate Coefficients and Photoionization Cross Sections for Astrophysically Abundant Elements. VII. Relativistic calculations for O VI and O VII for UV and X-ray modeling | Aimed at ionization balance and spectral analysis of UV and X-ray sources, we
present self-consistent sets of photoionization cross sections, recombination
cross sections, and rate coefficients for Li-like O VI and He-like O VII.
Relativistic fine structure is considered through the Breit-Pauli R-matrix
(BPRM) method i... | 0304204v1 |
2013-07-25 | Relaxation of Bose-Einstein Condensates of Magnons in Magneto-Textural Traps in Superfluid $^3$He-B | In superfluid $^3$He-B externally pumped quantized spin-wave excitations or
magnons spontaneously form a Bose-Einstein condensate in a 3-dimensional trap
created with the order-parameter texture and a shallow minimum in the
polarizing field. The condensation is manifested by coherent precession of the
magnetization wit... | 1307.6782v2 |
2014-01-07 | Spectral parameter power series for polynomial pencils of Sturm-Liouville operators and Zakharov-Shabat systems | A spectral parameter power series (SPPS) representation for solutions of
Sturm-Liouville equations of the form
$$(pu')'+qu=u\sum_{k=1}^{N}\lambda^{k}r_{k}$$ is obtained. It allows one to
write a general solution of the equation as a power series in terms of the
spectral parameter $\lambda$. The coefficients of the seri... | 1401.1520v1 |
2016-11-29 | Derivation of a generalized Schrödinger equation from the theory of scale relativity | Using Nottale's theory of scale relativity relying on a fractal space-time,
we derive a generalized Schr\"odinger equation taking into account the
interaction of the system with the external environment. This equation
describes the irreversible evolution of the system towards a static quantum
state. We first interpret ... | 1612.02323v1 |
2016-12-08 | Robust identification of harmonic oscillator parameters using the adjoint Fokker-Planck equation | We present a model-based output-only method for identifying from time series
the parameters governing the dynamics of stochastically forced oscillators. In
this context, suitable models of the oscillator's damping and stiffness
properties are postulated, guided by physical understanding of the oscillatory
phenomena. Th... | 1612.02579v1 |
2017-06-19 | Derivation of a generalized Schrödinger equation for dark matter halos from the theory of scale relativity | Using Nottale's theory of scale relativity, we derive a generalized
Schr\"odinger equation applying to dark matter halos. This equation involves a
logarithmic nonlinearity associated with an effective temperature and a source
of dissipation. Fundamentally, this wave equation arises from the
nondifferentiability of the ... | 1706.05900v2 |
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 |
2018-02-03 | Origin of the size-dependence of the equilibrium van der Waals binding between nanostructures | Nanostructures can be bound together at equilibrium by the van der Waals
(vdW) effect, a small but ubiquitous many-body attraction that presents
challenges to density functional theory. How does the binding energy depend
upon the size or number of atoms in one of a pair of identical nanostructures?
To answer this quest... | 1802.00975v1 |
2018-04-12 | System-size dependence of the viscous attenuation of anisotropic flow in p+Pb and Pb+Pb collisions at LHC energies | The elliptic and triangular flow coefficients ($\mathrm{v_n, \, n=2,3}$)
measured in Pb+Pb ($\sqrt{s_{_{\rm NN}}} = 2.76$ TeV) and p+Pb ($\sqrt{s_{_{\rm
NN}}} = 5.02$ TeV) collisions, are studied as a function of initial-state
eccentricity ($\varepsilon_n$), and dimensionless size characterized by the
cube root of the ... | 1804.04618v3 |
2019-03-04 | Role of geometrical cues in neuronal growth | Geometrical cues play an essential role in neuronal growth. Here, we quantify
axonal growth on surfaces with controlled geometries and report a general
stochastic approach that quantitatively describes the motion of growth cones.
We show that axons display a strong directional alignment on micro-patterned
surfaces when... | 1903.01337v2 |
2019-05-07 | On the reduction of required motions in the dynamic analysis using an optimization-based spectral matching | This study aims to show the efficiency of a proposed spectral matching
technique for the reduction of required ground motions in the dynamic time
history analysis. In this non-stationary spectral matching approach,
unconstrained optimization is employed to adjust the signal to match a target
spectrum. Adjustment factor... | 1905.02394v4 |
2019-06-11 | Anomalous diffusion for neuronal growth on surfaces with controlled geometries | Geometrical cues are known to play a very important role in neuronal growth
and the formation of neuronal networks. Here, we present a detailed analysis of
axonal growth and dynamics for neuronal cells cultured on patterned
polydimethylsiloxane surfaces. We use fluorescence microscopy to image neurons,
quantify their d... | 1906.05679v1 |
2019-11-01 | Free and forced wave propagation in beam lattice metamaterials with viscoelastic resonators | Beam lattice materials are characterized by a periodic microstructure
realizing a geometrically regular pattern of elementary cells. In these
microstructured materials, the dispersion properties governing the free dynamic
propagation of elastic waves can be studied by formulating parametric
lagrangian models and applyi... | 1911.00455v1 |
2020-11-18 | The theory of cosmic-ray scattering on pre-existing MHD modes meets data | We present a comprehensive study about the phenomenological implications of
the theory describing Galactic cosmic-ray scattering onto magnetosonic and
Alfv\'enic fluctuations in the $\mathrm{GeV} - \mathrm{PeV}$ domain. We compute
a set of diffusion coefficients from first principles, for different values of
the Alfv\'... | 2011.09197v2 |
2021-02-03 | On Geometric Fourier Particle In Cell Methods | In this article we describe a unifying framework for variational
electromagnetic particle schemes of spectral type, and we propose a novel
spectral Particle-In-Cell (PIC) scheme that preserves a discrete Hamiltonian
structure. Our work is based on a new abstract variational derivation of
particle schemes which builds o... | 2102.02106v1 |
2021-02-10 | Axion Quasiparticles for Axion Dark Matter Detection | It has been suggested that certain antiferromagnetic topological insulators
contain axion quasiparticles (AQs), and that such materials could be used to
detect axion dark matter (DM). The AQ is a longitudinal antiferromagnetic spin
fluctuation coupled to the electromagnetic Chern-Simons term, which, in the
presence of ... | 2102.05366v2 |
2021-05-16 | A Realizable Filtered Intrusive Polynomial Moment Method | Intrusive uncertainty quantification methods for hyperbolic problems exhibit
spurious oscillations at shocks, which leads to a significant reduction of the
overall approximation quality. Furthermore, a challenging task is to preserve
hyperbolicity of the gPC moment system. An intrusive method which guarantees
hyperboli... | 2105.07473v1 |
2021-10-04 | Probing three-state Potts nematic fluctuations by ultrasound attenuation | Motivated by recent studies of three-state Potts nematic states in
magic-angle twisted bilayer graphene and doped-Bi$_2$Se$_3$, we analyze the
impact of critical nematic fluctuations on the low energy properties of
phonons. In this study we propose how to identify the three-state Potts nematic
fluctuations by ultrasoun... | 2110.01308v4 |
2022-11-09 | Gravitational wave constraints on spatial covariant gravities | The direct discovery of gravitational waves (GWs) from the coalescence of
compact binary components by the LIGO/Virgo/KAGRA Collaboration provides an
unprecedented opportunity for exploring the underlying theory of gravity that
drives the coalescence process in the strong and highly dynamical field regime
of gravity. I... | 2211.04711v2 |
2023-09-08 | Minimum-dissipation model for large-eddy simulation in OpenFoam -A study on channel flow, periodic hills and flow over cylinder | The minimum-dissipation model is applied to turbulent channel flows up to
$Re_\tau = 2000$, flow past a circular cylinder at $Re=3900$, and flow over
periodic hills at $Re=10595$. Numerical simulations are performed in OpenFOAM
which is based on finite volume methods for discretizing partial differential
equations. We ... | 2309.04415v1 |
2023-11-02 | Minimum-dissipation model for large-eddy simulation using symmetry-preserving discretization in OpenFOAM | The minimum-dissipation model is applied to channel flow up to $Re_\tau =
2000$, flow past a circular cylinder at $Re=3900$, and flow over periodic hills
at $Re=10595$. Numerical simulations were performed in OpenFOAM which is based
on the finite volume methods. We used both symmetry-preserving and standard
second-orde... | 2311.01360v1 |
2023-11-03 | Room-Temperature CsPbBr$_3$ Mixed Polaritons States | Light-matter interactions are known to lead to the formation of polariton
states through what is called strong coupling, leading to the formation of two
hybrid states usually tagged as Upper and Lower Polaritons. Here, we consider a
similar interaction between excitons and photons in the realm of strong
interactions, w... | 2311.02252v2 |
1998-05-22 | Analytic description of the r-mode instability in uniform density stars | We present an analytic description of the $r$-mode instability in newly-born
neutron stars, using the approximation of uniform density. Our computation is
consistently accurate to second order in the angular velocity of the star. We
obtain formulae for the growth-time of the instability due to
gravitational-wave emissi... | 9805297v1 |
2004-06-21 | Resolution and accuracy of resonances in R-matrix cross sections | We investigate the effect of resonances in photoionization and recombination
cross sections computed using the R-matrix method. Photoionization and
recombination rates derived from high-resolution cross sections for oxygen ions
are compared with earlier works with less resolution and accuracy, such as in
the widely use... | 0406472v1 |
2006-07-01 | Exotic bulk viscosity and its influence on neutron star r-modes | We investigate the effect of exotic matter in particular, hyperon matter on
neutron star properties such as equation of state (EoS), mass-radius
relationship and bulk viscosity. Here we construct equations of state within
the framework of a relativistic field theoretical model. As hyperons are
produced abundantly in de... | 0607005v2 |
2006-07-11 | Collisional Particle Disks | We present a new, simple, fast algorithm to numerically evolve disks of
inelastically colliding particles surrounding a central star. Our algorithm
adds negligible computational cost to the fastest existing collisionless N-body
codes, and can be used to simulate, for the first time, the interaction of
planets with disk... | 0607241v1 |
2007-01-19 | Revised Primordial Helium Abundance Based on New Atomic Data | We have derived a primordial helium abundance of Yp = 0.2477 +- 0.0029, based
on new atomic physics computations of the recombination coefficients of He I
and of the collisional excitation of the H I Balmer lines together with
observations and photoionization models of metal-poor extragalactic H II
regions. The new ato... | 0701580v2 |
1995-07-03 | Fundamental steps of group velocity for slow surface polariton under the quantum hall effect conditions | A new type of collective electromagnetic excitations, namely surface
polaritons (SP) --- in a 2D electronic layer in a high magnetic field under
Quantum Hall Effect (QHE) conditions is predicted. We have found the spectrum,
damping, and polarization of the SP in a wide range of frequencies $\omega$ and
wavevectors $\bf... | 9507001v1 |
1996-04-26 | Macroscopic Quantum Tunneling of a Fluxon in a Long Josephson Junction | Macroscopic quantum tunneling (MQT) for a single fluxon moving along a long
Josephson junction is studied theoretically. To introduce a fluxon-pinning
force, we consider inhomogeneities made by modifying thickness of an insulating
layer locally. Two different situations are studied: one is the quantum
tunneling from a ... | 9604160v2 |
1997-09-03 | Shaping an ultracold atomic soliton in a travelling wave laser beam | An ultracold wave packet of bosonic atoms loaded into a travelling laser wave
may form a many-atom soliton.This is disturbed by a homogeneous force field,
for example by the inevitable gravitation. The wave packet is accelerated and
therefore the laser frequency appears to be chirped in the rest frame of the
atoms. We ... | 9709038v1 |
1997-10-20 | Row-switched states in two-dimensional underdamped Josephson junction arrays | When magnetic flux moves across layered or granular superconductor
structures, the passage of vortices can take place along channels which develop
finite voltage, while the rest of the material remains in the zero-voltage
state. We present analytical studies of an example of such mixed dynamics: the
row-switched (RS) s... | 9710204v1 |
1998-04-21 | Inelastic collapse of a randomly forced particle | We consider a randomly forced particle moving in a finite region, which
rebounds inelastically with coefficient of restitution r on collision with the
boundaries. We show that there is a transition at a critical value of r,
r_c\equiv e^{-\pi/\sqrt{3}}, above which the dynamics is ergodic but beneath
which the particle ... | 9804229v1 |
1999-02-25 | Mobility of Bloch Walls via the Collective Coordinate Method | We have studied the problem of the dissipative motion of Bloch walls
considering a totally anisotropic one dimensional spin chain in the presence of
a magnetic field. Using the so-called "collective coordinate method" we
construct an effective Hamiltonian for the Bloch wall coupled to the magnetic
excitations of the sy... | 9902330v1 |
2004-02-21 | Effect of backing thickness on determination of the phase in neutron reflectometry by variation of backing | The determination of density profiles with knowing the phase information of
complex reflection coefficient for neutron specularly reflected from a film,
yields unique results. Recently it has been shown that the phase can be
determined by using controlled variation of the scattering length density of
the fronting (inci... | 0402541v1 |
2004-03-23 | Phase transitions induced by noise cross-correlations | A general approach to consider spatially extended stochastic systems with
correlations between additive and multiplicative noises subject to nonlinear
damping is developed. Within modified cumulant expansion method, we derive an
effective Fokker-Planck equation whose stationary solutions describe a
character of ordered... | 0403583v2 |
2004-12-13 | Field-tuned quantum critical point of antiferromagnetic metals | A magnetic field applied to a three-dimensional antiferromagnetic metal can
destroy the long-range order and thereby induce a quantum critical point. Such
field-induced quantum critical behavior is the focus of many recent
experiments. We investigate theoretically the quantum critical behavior of
clean antiferromagneti... | 0412284v1 |
2005-10-13 | Statistical-mechanical description of classical test-particle dynamics in the presence of an external force field: modelling noise and damping from first principles | Aiming to establish a rigorous link between macroscopic random motion
(described e.g. by Langevin-type theories) and microscopic dynamics, we have
undertaken a kinetic-theoretical study of the dynamics of a classical
test-particle weakly coupled to a large heat-bath in thermal equilibrium. Both
subsystems are subject t... | 0510359v2 |
2006-04-13 | Dissipative magneto-optic solitons | Magneto-optic behaviour is a specific, non-reciprocal example of gyrotropic
behaviour. When coupled to photo-induced Faraday rotation it is possible to
discriminate this effect from the background of other nonlinear effects
Non-reciprocal behaviour is characteristic of artificial gyrotropy and can be
used in optical is... | 0604355v1 |
2006-12-07 | Dynamics of a metastable state nonlinearly coupled to a heat bath driven by an external noise | Based on a system-reservoir model, where the system is nonlinearly coupled to
a heat bath and the heat bath is modulated by an external stationary Gaussian
noise, we derive the generalized Langevin equation with space dependent
friction and multiplicative noise and construct the corresponding Fokker-Planck
equation, va... | 0612193v2 |
2002-12-03 | d-Dimensional Black Hole Entropy Spectrum from Quasi-Normal Modes | Starting from recent observations\cite{hod,dreyer1} about quasi-normal modes,
we use semi-classical arguments to derive the Bekenstein-Hawking entropy
spectrum for $d$-dimensional spherically symmetric black holes. We find that
the entropy spectrum is equally spaced: $S_{BH}=k \ln(m_0)n$, where $m_0$ is a
fixed integer... | 0212014v2 |
2003-12-17 | A Post-Newtonian diagnostic of quasi-equilibrium binary configurations of compact objects | Using equations of motion accurate to the third post-Newtonian (3PN) order
(O(v/c)^6 beyond Newtonian gravity), we derive expressions for the total energy
E and angular momentum J of the orbits of compact binary systems (black holes
or neutron stars) for arbitrary orbital eccentricity. We also incorporate
finite-size c... | 0312082v3 |
1994-07-29 | Standard Model Baryogenesis | Simply on CP arguments, we argue against a Standard Model explanation of
baryogenesis via the charge transport mechanism. A CP-asymmetry is found in the
reflection coefficients of quarks hitting the electroweak phase boundary
created during a first order phase transition. The problem is analyzed both in
an academic zer... | 9407403v2 |
2000-02-25 | A New Source for Electroweak Baryogenesis in the MSSM | One of the most experimentally testable explanations for the origin of the
baryon asymmetry of the universe is that it was created during the electroweak
phase transition, in the minimal supersymmetric standard model. Previous
efforts have focused on the current for the difference of the two Higgsino
fields, $H_1-H_2$,... | 0002272v2 |
2000-06-15 | Development of the electroweak phase transition and baryogenesis | We investigate the evolution of the electroweak phase transition, using a
one-Higgs effective potential that can be regarded as an approximation for the
Minimal Supersymmetric Standard Model. The phase transition occurs in a small
interval around a temperature T_t below the critical one. We calculate this
temperature a... | 0006177v2 |
2001-03-09 | Transport theory for a two-flavor color superconductor | QCD with two light quark flavors at high baryonic density and low temperature
is a color superconductor. The diquark condensate partially breaks the SU(3)
gauge symmetry down to an SU(2) subgroup. We study thermal fluctuations of the
superconductor for temperatures below the gap. These are described by a simple
transpo... | 0103092v2 |
2002-05-18 | Perturbative and non-perturbative aspects of the non-abelian Boltzmann-Langevin equation | We study the Boltzmann-Langevin equation which describes the dynamics of hot
Yang-Mills fields with typical momenta of order of the magnetic screening scale
g^2 T. It is transformed into a path integral and Feynman rules are obtained.
We find that the leading log Langevin equation can be systematically improved
in a we... | 0205202v2 |
2003-07-05 | Hard Loops, Soft Loops, and High Density Effective Field Theory | We study several issues related to the use of effective field theories in QCD
at large baryon density. We show that the power counting is complicated by the
appearance of two scales inside loop integrals. Hard dense loops involve the
large scale $\mu^2$ and lead to phenomena such as screening and damping at the
scale $... | 0307074v1 |
2004-02-04 | Infrared Behavior of High-Temperature QCD | The damping rate \gamma_t(p) of on-shell transverse gluons with ultrasoft
momentum p is calculated in the context of next-to-leading-order
hard-thermal-loop-summed perturbation of high-temperature QCD. It is obtained
in an expansion to second order in p. The first coefficient is recovered but
that of order p^2 is found... | 0402041v1 |
2004-06-04 | Shear Viscosity in a CFL Quark Star | We compute the mean free path and shear viscosity in the color-flavor locked
(CFL) phase of dense quark matter at low temperature T, when the contributions
of mesons, quarks and gluons to the transport coefficients are Boltzmann
suppressed. CFL quark matter displays superfluid properties, and transport
phenomena in suc... | 0406058v3 |
2005-01-11 | Fermionic dispersion relations in ultradegenerate relativistic plasmas beyond leading logarithmic order | We determine the dispersion relations of fermionic quasiparticles in
ultradegenerate plasmas by a complete evaluation of the on-shell
hard-dense-loop-resummed one-loop fermion self energy for momenta of the order
of the Fermi momentum and above. In the case of zero temperature, we calculate
the nonanalytic terms in the... | 0501089v2 |
1994-07-19 | On the Macroscopic Limit of Nuclear Dissipation | The Landau-Vlasov equation is applied to a slab of width $L$. This geometry
is introduced to simulate somehow the finiteness of real nuclei but to allow
for analytical solutions, nevertheless. We focus on the damping of low
frequency surface modes and discuss their friction coefficient. For this
quantity we study the m... | 9407029v1 |
1997-12-08 | Amplitude equations and pattern selection in Faraday waves | A nonlinear theory of pattern selection in parametric surface waves (Faraday
waves) is presented that is not restricted to small viscous dissipation. By
using a multiple scale asymptotic expansion near threshold, a standing wave
amplitude equation is derived from the governing equations. The amplitude
equation is of gr... | 9712003v1 |
2003-04-17 | Linear theory of nonlocal transport in a magnetized plasma | A system of nonlocal electron-transport equations for small perturbations in
a magnetized plasma is derived using the systematic closure procedure of V. Yu.
Bychenkov et al., Phys. Rev. Lett. 75, 4405 (1995). Solution to the linearized
kinetic equation with a Landau collision operator is obtained in the diffusive
appro... | 0304063v1 |
2005-10-20 | Probing liquid surface waves, liquid properties and liquid films with light diffraction | Surface waves on liquids act as a dynamical phase grating for incident light.
In this article, we revisit the classical method of probing such waves
(wavelengths of the order of mm) as well as inherent properties of liquids and
liquid films on liquids, using optical diffraction. A combination of simulation
and experime... | 0510184v2 |
2002-04-30 | Laser-driven atom moving in a multimode cavity: strong enhancement of cavity-cooling efficiency | Cavity-mediated cooling of the center--of--mass motion of a transversally,
coherently pumped atom along the axis of a high--Q cavity is studied. The
internal dynamics of the atomic dipole strongly coupled to the cavity field is
treated by a non-perturbative quantum mechanical model, while the effect of the
cavity on th... | 0204170v1 |
2004-07-06 | Field quantization in inhomogeneous absorptive dielectrics | The quantization of the electromagnetic field in a three-dimensional
inhomogeneous dielectric medium with losses is carried out in the framework of
a damped-polariton model with an arbitrary spatial dependence of its
parameters. The equations of motion for the canonical variables are solved
explicitly by means of Lapla... | 0407045v1 |
2006-09-15 | Photoionization Broadening of the 1S-2S Transition in a Beam of Atomic Hydrogen | We consider the excitation dynamics of the two-photon \sts transition in a
beam of atomic hydrogen by 243 nm laser radiation. Specifically, we study the
impact of ionization damping on the transition line shape, caused by the
possibility of ionization of the 2S level by the same laser field. Using a
Monte-Carlo simulat... | 0609114v1 |
2006-09-21 | ε-convertibility of entangled states and extension of Schmidt rank in infinite-dimensional systems | By introducing the concept of $\epsilon$-convertibility, we extend Nielsen's
and Vidal's theorems to the entanglement transformation of infinite-dimensional
systems. Using an infinite-dimensional version of Vidal's theorem we derive a
new stochastic-LOCC (SLOCC) monotone which can be considered as an extension of
the S... | 0609167v4 |
2007-04-20 | Determining factors behind the PageRank log-log plot | We study the relation between PageRank and other parameters of information
networks such as in-degree, out-degree, and the fraction of dangling nodes. We
model this relation through a stochastic equation inspired by the original
definition of PageRank. Further, we use the theory of regular variation to
prove that PageR... | 0704.2694v1 |
2007-05-15 | Electrical excitation of shock and soliton-like waves in two-dimensional electron channels | We study electrical excitation of nonlinear plasma waves in heterostructures
with two-dimensional electron channels and with split gates, and the
propagation of these waves using hydrodynamic equations for electron transport
coupled with two-dimensional Poisson equation for self-consistent electric
potential. The term ... | 0705.2111v1 |
2007-07-27 | Oscillatory D'yakonov-Perel' spin dynamics in two dimensional electron gases | Optical pump-probe measurements of spin-dynamics at temperatures down to 1.5K
are described for a series of (001)-oriented GaAs/AlGaAs quantum well samples
containing high mobility two-dimensional electron gases (2DEGs). For well
widths ranging from 5 nm to 20 nm and 2DEG sheet densities from 1.75x1011cm-2
to 3.5x1011c... | 0707.4180v1 |
2008-01-07 | Field Theoretic Description of Ultrarelativistic Electron-Positron Plasmas | Ultrarelativistic electron-positron plasmas can be produced in high-intensity
laser fields and play a role in various astrophysical situations. Their
properties can be calculated using QED at finite temperature. Here we will use
perturbative QED at finite temperature for calculating various important
properties, such a... | 0801.0956v2 |
2008-05-20 | Probability of metastable configurations in spherical three-dimensional Yukawa crystals | Recently the occurrence probabilities of ground- and metastable states of
three-dimensional Yukawa clusters with 27 and 31 particles have been analyzed
in dusty plasma experiments [Block et al., Physics of Plasmas 15, 040701
(2008)]. There it was found that, in many cases, the ground state appeared
substantially less f... | 0805.3016v1 |
2008-05-29 | Dispersion enhancement and damping by buoyancy driven flows in 2D networks of capillaries | The influence of a small relative density difference on the displacement of
two miscible liquids is studied experimentally in transparent 2D networks of
micro channels. Both stable displacements in which the denser fluid enters at
the bottom of the cell and displaces the lighter one and unstable displacements
in which ... | 0805.4564v1 |
2008-06-12 | Vortex dynamics in trapped Bose-Einstein condensate | We perform numerical simulations of vortex motion in a trapped Bose-Einstein
condensate by solving the two-dimensional Gross-Pitaevskii Equation in the
presence of a simple phenomenological model of interaction between the
condensate and the finite temperature thermal cloud. At zero temperature, the
trajectories of a s... | 0806.2077v2 |
2008-06-12 | Diversity-induced resonance in a system of globally coupled linear oscillators | The purpose of this paper to analyze in some detail the arguably simplest
case of diversity-induced reseonance: that of a system of globally-coupled
linear oscillators subjected to a periodic forcing. Diversity appears as the
parameters characterizing each oscillator, namely its mass, internal frequency
and damping coe... | 0806.2106v1 |
2008-08-05 | From Equilibrium to Transport Properties of Strongly Correlated Fermi Liquids | We summarize recent results regarding the equilibrium and non-equilibrium
behavior of cold dilute atomic gases in the limit in which the two body
scattering length a goes to infinity. In this limit the system is described by
a Galilean invariant (non-relativistic) conformal field theory. We discuss the
low energy effec... | 0808.0734v1 |
2008-09-09 | What can we learn from electromagnetic plasmas about the quark-gluon plasma? | Ultra-relativistic electromagnetic plasmas can be used for improving our
understanding of the quark-gluon plasma. In the weakly coupled regime both
plasmas can be described by transport theoretical and quantum field theoretical
methods leading to similar results for the plasma properties (dielectric
tensor, dispersion ... | 0809.1507v1 |
2008-10-06 | Ultrarelativistic Electron-Positron Plasma | Ultrarelativistic electron-positron plasmas can be produced in high-intensity
laser fields and play a role in various astrophysical situations. Their
properties can be calculated using QED at finite temperature. Here we will use
perturbative QED at finite temperature for calculating various important
properties, such a... | 0810.0909v1 |
2009-01-27 | A simple, low-cost, data-logging pendulum built from a computer mouse | Lessons and homework problems involving a pendulum are often a big part of
introductory physics classes and laboratory courses from high school to
undergraduate levels. Although laboratory equipment for pendulum experiments is
commercially available, it is often expensive and may not be affordable for
teachers on fixed... | 0901.4319v1 |
2009-02-18 | Frequency dependence of viscous and viscoelastic dissipation in coated micro-cantilevers from noise measurement | We measure the mechanical thermal noise of soft silicon atomic force
microscopy cantilevers. Using an interferometric setup, we have a resolution
down to 1E-14 m/rtHz on a wide spectral range (3 Hz to 1E5 Hz). The low
frequency behavior depends dramatically on the presence of a reflective
coating: almost flat spectrums... | 0902.3134v2 |
2009-03-10 | Phonon-phonon interactions and phonon damping in carbon nanotubes | We formulate and study the effective low-energy quantum theory of interacting
long-wavelength acoustic phonons in carbon nanotubes within the framework of
continuum elasticity theory. A general and analytical derivation of all three-
and four-phonon processes is provided, and the relevant coupling constants are
determi... | 0903.1771v2 |
2009-03-30 | Breit-Wigner resonances and the quasinormal modes of anti-de Sitter black holes | The purpose of this short communication is to show that the theory of
Breit-Wigner resonances can be used as an efficient numerical tool to compute
black hole quasinormal modes. For illustration we focus on the Schwarzschild
anti-de Sitter (SAdS) spacetime. The resonance method is better suited to small
SAdS black hole... | 0903.5311v1 |
2009-08-21 | Aspects of warm-flat directions | Considering the mechanism of dissipative slow-roll that has been used in warm
inflation scenario, we show that dissipation may alter usual cosmological
scenarios associated with SUSY-flat directions. We mainly consider SUSY-flat
directions that have strong interactions with non-flat directions and may cause
strong diss... | 0908.3059v4 |
2009-10-19 | Friction force on slow charges moving over supported graphene | We provide a theoretical model that describes the dielectric coupling of a 2D
layer of graphene, represented by a polarization function in the Random Phase
Approximation, and a semi-infinite 3D substrate, represented by a surface
response function in a non-local formulation. We concentrate on the role of the
dynamic re... | 0910.3586v1 |
2009-11-15 | Effect of three-body loss on itinerant ferromagnetism in an atomic Fermi gas | A recent experiment has provided the first evidence for itinerant
ferromagnetism in an ultracold atomic gas of fermions with repulsive
interactions. However, the gas in this regime is also subject to significant
three-body loss. We adopt an extended Hertz-Millis theory to account for the
effect of loss on the transitio... | 0911.2839v1 |
2009-12-18 | Gravitational Instability in Presence of Bulk Viscosity: the Jeans Mass and the Quasi-Isotropic Solution | This paper focuses on the analysis of the gravitational instability in
presence of bulk viscosity both in Newtonian regime and in the
fully-relativistic approach. The standard Jeans Mechanism and the
Quasi-Isotropic Solution are treated expressing the bulk-viscosity coefficient
$\zeta$ as a power-law of the fluid energ... | 0912.3641v1 |
2010-01-14 | A Theoretical Closure for Turbulent Flows Near Walls | This paper proposes a simple new closure principle for turbulent shear flows.
The turbulent flow field is divided into an outer and an inner region. The
inner region is made up of a log-law region and a wall layer. The wall layer is
viewed in terms of the well known inrush-sweep-burst sequence observed since
1967. It i... | 1001.2353v1 |
2010-02-23 | Bulk viscosity in hyperonic star and r-mode instability | We consider a rotating neutron star with the presence of hyperons in its
core, using an equation of state in an effective chiral model within the
relativistic mean field approximation. We calculate the hyperonic bulk
viscosity coefficient due to nonleptonic weak interactions. By estimating the
damping timescales of the... | 1002.4253v1 |
2010-03-03 | Phonon lineshapes in atom-surface scattering | Phonon lineshapes in atom-surface scattering are obtained from a simple
stochastic model based on the so-called Caldeira-Leggett Hamiltonian. In this
single-bath model, the excited phonon resulting from a creation or annihilation
event is coupled to a thermal bath consisting of an infinite number of harmonic
oscillator... | 1003.0790v2 |
2010-03-30 | Superfluid hyperon bulk viscosity and the r-mode instability of rotating neutron stars | In order to establish whether the unstable r-modes in a rotating neutron star
provide a detectable source of gravitational waves, we need to understand the
details of the many dissipative processes that tend to counteract the
instability. It has been established that the bulk viscosity due to exotic
particles, like hyp... | 1003.5849v1 |
2010-05-07 | r-modes in low temperature colour-flavour-locked superconducting quark star | We present the first multi-fluid analysis of a dense neutron star core with a
deconfined colour-flavour-locked superconducting quark component. Accounting
only for the condensate and (finite temperature) phonons, we make progress by
taking over results for superfluid $^4$He. The resultant two-fluid model
accounts for a... | 1005.1163v1 |
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