publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
|---|---|---|---|
2008-02-14 | Influence of an inner disc on the orbital evolution of massive planets migrating in resonance | The formation of resonant pairs of planets in exoplanetary systems involves
planetary migration in the protoplanetary disc. After a resonant capture, the
subsequent migration in this configuration leads to a large increase of
planetary eccentricities if no damping mechanism is applied. This has led to
the conclusion th... | 0802.2014v1 |
2008-04-10 | Embedded Oscillating Starless Cores | In a previous paper we demonstrated that non-radial hydrodynamic oscillations
of a thermally-supported (Bonnor-Ebert) sphere embedded in a low-density,
high-temperature medium persist for many periods. The predicted column density
variations and molecular spectral line profiles are similar to those observed
in the Bok ... | 0804.1790v1 |
2008-05-07 | Design of parametrically forced patterns and quasipatterns | The Faraday wave experiment is a classic example of a system driven by
parametric forcing, and it produces a wide range of complex patterns, including
superlattice patterns and quasipatterns. Nonlinear three-wave interactions
between driven and weakly damped modes play a key role in determining which
patterns are favou... | 0805.0878v1 |
2008-06-19 | Itinerant spin excitations near the hidden order transition in URu2Si2 | By means of neutron scattering we show that the high-temperature precursor to
the hidden order state of the heavy fermion superconductor URu$_{2}$Si$_{2}$
exhibits heavily damped incommensurate paramagnons whose strong energy
dispersion is very similar to that of the long-lived longitudinal f-spin
excitations that appe... | 0806.3137v2 |
2008-11-21 | Specific heat anomalies of open quantum systems | The evaluation of the specific heat of an open, damped quantum system is a
subtle issue. One possible route is based on the thermodynamic partition
function which is the ratio of the partition functions of system plus bath and
of the bath alone. For the free damped particle it has been shown, however,
that the ensuing ... | 0811.3509v2 |
2008-11-26 | Three-dimensional simulations of multiple protoplanets embedded in a protostellar disc | Protoplanet eccentricities of e >~ H/r can slow or reverse migration, but
previous 2D studies have shown that gravitational scattering cannot maintain
significant planet eccentricities against disc-induced damping. We simulate the
evolution of low-mass protoplanetary swarms in three dimensions. The aim is to
examine bo... | 0811.4322v1 |
2008-12-15 | Swift-UVOT captures the earliest ultraviolet spectrum of a Gamma Ray Burst | We present the earliest ever ultraviolet spectrum of a gamma-ray burst (GRB)
as observed with the Swift-UVOT. The GRB 081203A spectrum was observed for 50
seconds with the UV grism starting 251 seconds after the Swift-BAT trigger when
the GRB was of u ~13.4 mag and still rising to its peak optical brightness. The
UV gr... | 0812.2943v2 |
2008-12-16 | On the oscillations of dissipative superfluid neutron stars | We investigate the oscillations of slowly rotating superfluid stars, taking
into account the vortex mediated mutual friction force that is expected to be
the main damping mechanism in mature neutron star cores. Working to linear
order in the rotation of the star, we consider both the fundamental f-modes and
the inertia... | 0812.3023v1 |
2009-03-27 | Cascade and Damping of Alfvén-Cyclotron Fluctuations: Application to Solar Wind Turbulence | It is well-recognized that the presence of magnetic fields will lead to
anisotropic energy cascade and dissipation of astrophysical turbulence. With
the diffusion approximation and linear dissipation rates, we study the cascade
and damping of Alfv\'en-cyclotron fluctuations in solar plasmas numerically.
For an isotropi... | 0903.4904v1 |
2009-04-17 | Plasmons and polaritons in a semi-infinite plasma and a plasma slab | Plasmon and polariton modes are derived for an ideal semi-infinite
(half-space) plasma and an ideal plasma slab by using a general, unifying
procedure, based on equations of motion, Maxwell's equations and suitable
boundary conditions. Known results are re-obtained in much a more direct manner
and new ones are derived.... | 0904.2662v1 |
2009-09-30 | Dynamic polarization of graphene by moving external charges: random phase approximation | We evaluate the stopping and image forces on a charged particle moving
parallel to a doped sheet of graphene by using the dielectric response
formalism for graphene's $\pi$-electron bands in the random phase approximation
(RPA). The forces are presented as functions of the particle speed and the
particle distance for a... | 0909.5598v3 |
2010-02-05 | Implementation of an Innovative Bio Inspired GA and PSO Algorithm for Controller design considering Steam GT Dynamics | The Application of Bio Inspired Algorithms to complicated Power System
Stability Problems has recently attracted the researchers in the field of
Artificial Intelligence. Low frequency oscillations after a disturbance in a
Power system, if not sufficiently damped, can drive the system unstable. This
paper provides a sys... | 1002.1184v1 |
2010-03-12 | Improving the model of emission from spinning dust: effects of grain wobbling and transient spin-up | Observations continue to support the interpretation of the anomalous
microwave foreground as electric dipole radiation from spinning dust grains as
proposed by Draine and Lazarian (1998ab). In this paper we present a refinement
of the original model by improving the treatment of a number of physical
effects. First, we ... | 1003.2638v2 |
2010-03-15 | Small BGK waves and nonlinear Landau damping | Consider 1D Vlasov-poisson system with a fixed ion background and periodic
condition on the space variable. First, we show that for general homogeneous
equilibria, within any small neighborhood in the Sobolev space W^{s,p}
(p>1,s<1+(1/p)) of the steady distribution function, there exist nontrivial
travelling wave solut... | 1003.3005v1 |
2010-04-06 | Electronic screening and damping in magnetars | We calculate the screening of the ion-ion potential due to electrons in the
presence of a large background magnetic field, at densities of relevance to
neutron star crusts. Using the standard approach to incorporate electron
screening through the one-loop polarization function, we show that the magnetic
field produces ... | 1004.0926v1 |
2010-06-25 | Decoherence window and electron-nuclear cross-relaxation in the molecular magnet V 15 | Rabi oscillations in the V_15 Single Molecule Magnet (SMM) embedded in the
surfactant DODA have been studied at different microwave powers. An intense
damping peak is observed when the Rabi frequency Omega_R falls in the vicinity
of the Larmor frequency of protons w_N, while the damping time t_R of
oscillations reaches... | 1006.4960v3 |
2010-08-31 | A SINFONI Integral Field Spectroscopy Survey for Galaxy Counterparts to Damped Lyman-alpha Systems - II. Dynamical Properties of the Galaxies towards Q0302-223 and Q1009-0026 | Details of processes through which galaxies convert their gas into stars need
to be studied in order to obtain a complete picture of galaxy formation. One
way to tackle these phenomena is to relate the HI gas and the stars in
galaxies. Here, we present dynamical properties of Damped and sub-Damped
Lyman-alpha Systems i... | 1009.0027v1 |
2010-11-10 | Standing Slow-Mode Waves in Hot Coronal Loops: Observations, Modeling, and Coronal Seismology | Strongly damped Doppler shift oscillations are observed frequently associated
with flarelike events in hot coronal loops. In this paper, a review of the
observed properties and the theoretical modeling is presented. Statistical
measurements of physical parameters (period, decay time, and amplitude) have
been obtained b... | 1011.2483v1 |
2010-11-29 | Long-time dynamics of Kirchhoff wave models with strong nonlinear damping | We study well-posedness and long-time dynamics of a class of quasilinear wave
equations with a strong damping. We accept the Kirchhoff hypotheses and assume
that the stiffness and damping coefficients are $C^1$ functions of the
$L_2$-norm of the gradient of the displacement. We first prove the existence
and uniqueness ... | 1011.6271v3 |
2010-12-01 | Dissipative processes in superfluid neutron stars | We present some results about a novel damping mechanism of r-mode
oscillations in neutron stars due to processes that change the number of
protons, neutrons and electrons. Deviations from equilibrium of the number
densities of the various species lead to the appearance in the Euler equations
of the system of a dissipat... | 1012.0345v1 |
2011-01-19 | Numerical simulation of fundamental trapped sausage modes | Context: We integrate the 2D MHD ideal equations of a straight slab to
simulate observational results associated with fundamental sausage trapped
modes. Aims: Starting from a non-equilibrium state with a dense chromospheric
layer, we analyse the evolution of the internal plasma dynamics of magnetic
loops, subject to li... | 1101.3782v1 |
2011-03-25 | Dissipation and Vertical Energy Transport in Radiation-Dominated Accretion Disks | Standard models of radiation supported accretion disks generally assume that
diffusive radiation flux is solely responsible for vertical heat transport.
This requires that heat must be generated at a critical rate per unit volume if
the disk is to be in hydrostatic and thermal equilibrium. This raises the
question of h... | 1103.5052v1 |
2011-06-09 | Planet-disk interaction in highly inclined systems | We study the interaction of a proto-planetary disk and a planet on a highly
inclined orbit in the linear regime. The evolution of the planet is dominated
by dynamical friction for planet masses above several Earth-masses. Smaller
planets are dominated by aerodynamic drag, especially for very high
inclinations and retro... | 1106.1869v2 |
2011-08-16 | Brownian force noise from molecular collisions and the sensitivity of advanced gravitational wave observatories | We present an analysis of Brownian force noise from residual gas damping of
reference test masses as a fundamental sensitivity limit in small force
experiments. The resulting acceleration noise increases significantly when the
distance of the test mass to the surrounding experimental apparatus is smaller
than the dimen... | 1108.3254v2 |
2011-09-22 | Hole spin relaxation and coefficients in Landau-Lifshitz-Gilbert equation in ferromagnetic GaMnAs | We investigate the temperature dependence of the coefficients in the
Landau-Lifshitz-Gilbert equation in ferromagnetic GaMnAs by employing the Zener
model. We first calculate the hole spin relaxation time based on the
microscopic kinetic equation. We find that the hole spin relaxation time is
typically several tens fem... | 1109.4964v1 |
2011-09-23 | Accretion of Rocky Planets by Hot Jupiters | The observed population of Hot Jupiters displays a stunning variety of
physical properties, including a wide range of densities and core sizes for a
given planetary mass. Motivated by the observational sample, this paper studies
the accretion of rocky planets by Hot Jupiters, after the Jovian planets have
finished thei... | 1109.5104v1 |
2011-09-27 | Dispersion and damping of zone-boundary magnons in the noncentrosymmetric superconductor CePt3Si | Inelastic neutron scattering (INS) is employed to study damped spin-wave
excitations in the noncentrosymmetric heavy-fermion superconductor CePt3Si
along the antiferromagnetic Brillouin-zone boundary in the low-temperature
magnetically ordered state. Measurements along the (1/2 1/2 L) and (H H 1/2-H)
reciprocal-space d... | 1109.5784v1 |
2011-11-15 | Spin waves in nanosized magnetic films | We have studied spin excitations in nanosized magnetic films in the
Heisenberg model with magnetic dipole and exchange interactions by the spin
operator diagram technique. Dispersion relations of spin waves in thin magnetic
films (in two-dimensional magnetic monolayers and in two-layer magnetic films)
and the spin-wave... | 1111.3532v1 |
2011-12-16 | Nonlinear viscous damping and gravitational wave detectability of the f-mode instability in neutron stars | We study the damping of the gravitational radiation-driven f-mode instability
in rotating neutron stars by nonlinear bulk viscosity in the so-called
supra-thermal regime. In this regime the dissipative action of bulk viscosity
is known to be enhanced as a result of nonlinear contributions with respect to
the oscillatio... | 1112.3931v2 |
2012-01-23 | PageRank and rank-reversal dependence on the damping factor | PageRank (PR) is an algorithm originally developed by Google to evaluate the
importance of web pages. Considering how deeply rooted Google's PR algorithm is
to gathering relevant information or to the success of modern businesses, the
question of rank-stability and choice of the damping factor (a parameter in the
algor... | 1201.4787v1 |
2012-02-28 | Planetesimal Dynamics in Inclined Binary Systems: The Role of Gas-Disk Gravity | We investigate the effects of gas-disk gravity on the planetesimal dynamics
in inclined binary systems, where the circumprimary disk plane is tilted by a
significant angle ($i_B$) with respect to the binary disk plane. Our focus is
on the Lidov-Kozai mechanism and the evolution of planetesimal eccentricity and
inclinat... | 1202.6102v1 |
2012-04-20 | The Stability of Massive Main Sequence Stars as a Function of Metallicity | We investigate the pulsational stability of massive (M >~ 120 Msun) main
sequence stars of a range of metallicities, including primordial, Population
III stars. We include a formulation of convective damping motivated by
numerical simulations of the interaction between convection and periodic shear
flows. We find that ... | 1204.4741v1 |
2012-05-14 | Dynamics of multipartite quantum correlations under decoherence | Quantum discord is an optimal resource for the quantification of classical
and non-classical correlations as compared to other related measures. Geometric
measure of quantum discord is another measure of quantum correlations.
Recently, the geometric quantum discord for multipartite states has been
introduced by Jianwei... | 1205.3133v1 |
2012-06-04 | In search of random uncorrelated particle motion (RUM) in a simple random flow field | DNS studies of dispersed particle motion in isotropic homogeneous turbulence
[1] have revealed the existence of a component of random uncorrelated motion
(RUM)dependent on the particle inertia {\tau}p(normalised particle response
time or Stoke number). This paper reports the presence of RUM in a simple
linear random sm... | 1206.0572v1 |
2012-06-11 | Solitons in a parametrically driven damped discrete nonlinear Schrödinger equation | We consider a parametrically driven damped discrete nonlinear Schr\"odinger
(PDDNLS) equation. Analytical and numerical calculations are performed to
determine the existence and stability of fundamental discrete bright solitons.
We show that there are two types of onsite discrete soliton, namely onsite type
I and II. W... | 1206.2405v1 |
2012-07-13 | Axion as a cold dark matter candidate: low-mass case | Axion as a coherently oscillating scalar field is known to behave as a cold
dark matter in all cosmologically relevant scales. For conventional axion mass
with 10^{-5} eV, the axion reveals a characteristic damping behavior in the
evolution of density perturbations on scales smaller than the solar system
size. The damp... | 1207.3124v1 |
2012-09-04 | Solving Vlasov Equations Using NRxx Method | In this paper, we propose a moment method to numerically solve the Vlasov
equations using the framework of the NRxx method developed in [6, 8, 7] for the
Boltzmann equation. Due to the same convection term of the Boltzmann equation
and the Vlasov equation, it is very convenient to use the moment expansion in
the NRxx m... | 1209.0527v1 |
2012-10-09 | A close-pair analysis of damp mergers at intermediate redshifts | We have studied the kinematics of ~2800 candidate close pair galaxies at
0.1<z<1.2 identified from the Canada-France-Hawaii Telescope Legacy Survey
fields. Spectra of these systems were obtained using spectrometers on the 6.5m
Magellan and 5m Hale telescopes. These data allow us to constrain the rate of
dry mergers at ... | 1210.2692v1 |
2012-10-24 | Dual Trigger of Transverse Oscillations in a Prominence by EUV Fast and Slow Coronal Waves: SDO/AIA and STEREO/EUVI Observations | We analyze flare-associated transverse oscillations in a quiescent solar
prominence on 8-9 September, 2010. Both the flaring active region and the
prominence were located near the West limb, with a favorable configuration and
viewing angle. The fulldisk extreme ultraviolet (EUV) images of the Sun
obtained with high spa... | 1210.6690v1 |
2012-10-25 | Molecular dissipation in the nonlinear eddy viscosity in the Navier-Stokes equations: modelling of accretion discs | Physical damping, regarding the nonlinear Navier-Stokes viscous flow
dynamics, refers to a tensorial turbulent dissipation term, attributed to
adjacent moving macroscopic flow components. Mutual dissipation among these
parts of fluid is described by a braking term in the momentum equation together
with a heating term i... | 1210.6848v3 |
2012-11-07 | Gaussification through decoherence | We investigate the loss of nonclassicality and non-Gaussianity of a
single-mode state of the radiation field in contact with a thermal reservoir.
The damped density matrix for a Fock-diagonal input is written using the Weyl
expansion of the density operator. Analysis of the evolution of the
quasiprobability densities r... | 1211.1701v3 |
2013-02-05 | Complex fragment emission in low energy light-ion reactions | Inclusive energy spectra of the complex fragments (3 $\leq$ Z $\leq$ 5)
emitted in the reactions $^{12}$C (77 MeV)+ $^{28}$Si, $^{11}$B (64 MeV)+
$^{28}$Si and $^{12}$C (73 MeV)+ $^{27}$Al (all having the same excitation
energy of $ \sim$ 67 MeV), have been measured in the angular range of
10$^\circ$ $\lesssim \theta_{... | 1302.1002v1 |
2013-02-11 | Propagation of Alfvénic Waves From Corona to Chromosphere and Consequences for Solar Flares | How do magnetohydrodynamic waves travel from the fully ionized corona, into
and through the underlying partially ionized chromosphere, and what are the
consequences for solar flares? To address these questions, we have developed a
2-fluid model (of plasma and neutrals) and used it to perform 1D simulations of
Alfv\'en ... | 1302.2458v1 |
2013-02-25 | Non-classical Correlations in the Quantum Search Algorithm | Entanglement lies at the heart of quantum mechanics and has no classical
analogue. It is central to the speed up achieved by quantum algorithms over
their classical counterparts. The Grover's search algorithm is one such
algorithm which enables us to achieve a quadratic speed up over any known
classical algorithm that ... | 1302.6005v1 |
2013-03-01 | Generation of Electrostatic Waves via Parametric Instability and Heating of Solar Corona | In the upper layers of the solar atmosphere the temperature increases
sharply. We studied possibility of the transfer of neutrals motion energy into
the electrostatic waves.Electrostatic waves could damp in the upper layers of
the solar atmosphere and their energy could be transformed into the thermal
energy of the sol... | 1303.0151v1 |
2013-03-19 | Cosmic Ray Streaming in Clusters of Galaxies | The observed bimodality in radio luminosity in galaxy clusters is puzzling.
We investigate the possibility that cosmic-ray (CR) streaming in the
intra-cluster medium can 'switch off' hadronically induced radio and gamma-ray
emission. For self-confined CRs, this depends on the source of MHD wave
damping: if only non-lin... | 1303.4746v1 |
2013-05-13 | New features of ion acoustic waves in inhomogeneous and permeating plasmas | It is generally accepted that the ion acoustic (IA) wave in plasmas
containing ions and electrons with the same temperature is of minor importance
due to strong damping of the wave by hot resonant ions. In this work it will be
shown that the IA wave is susceptible to excitation even in plasmas with hot
ions when both a... | 1305.2739v1 |
2013-05-15 | Beam energy dependence of the viscous damping of anisotropic flow | The flow harmonics $v_{2,3}$ for charged hadrons, are studied for a broad
range of centrality selections and beam collision energies in Au+Au
($\sqrt{s_{NN}}= 7.7 - 200$ GeV) and Pb+Pb ($\sqrt{s_{NN}}= 2.76$ TeV)
collisions. They validate the characteristic signature expected for the system
size dependence of viscous d... | 1305.3341v3 |
2013-07-19 | Exact 3D solution for static and damped harmonic response of simply supported general laminates | The state-space method is adapted to obtain three dimensional exact solutions
for the static and damped dynamic behaviors of simply supported general
laminates. The state-space method is written in a general form that permits to
handle both cross-ply and antisymmetric angle-ply laminates. This general form
also permits... | 1307.5285v2 |
2013-07-25 | Lyman-alpha Heating of Inhomogeneous High-redshift Intergalactic Medium | The intergalactic medium (IGM) prior to the epoch of reionization consists
mostly of neutral hydrogen gas. Ly-alpha photons produced by early stars
resonantly scatter off hydrogen atoms, causing energy exchange between the
radiation field and the gas. This interaction results in moderate heating of
the gas due to the r... | 1307.6859v2 |
2013-08-17 | Thickness and power dependence of the spin-pumping effect in Y3Fe5O12/Pt heterostructures measured by the inverse spin Hall effect | The dependence of the spin-pumping effect on the yttrium iron garnet
(Y3Fe5O12, YIG) thickness detected by the inverse spin Hall effect (ISHE) has
been investigated quantitatively. Due to the spin-pumping effect driven by the
magnetization precession in the ferrimagnetic insulator YIG film a
spin-polarized electron cur... | 1308.3787v1 |
2013-09-13 | Analytical and experimental stability investigation of a hardware-in-the-loop satellite docking simulator | The European Proximity Operation Simulator (EPOS) of the DLR-German Aerospace
Center is a robotics-based simulator that aims at validating and verifying a
satellite docking phase. The generic concept features a robotics tracking
system working in closed loop with a force/torque feedback signal. Inherent
delays in the t... | 1309.3512v1 |
2013-11-12 | Investigation into electron cloud effects in the International Linear Collider positron damping ring | We report modeling results for electron cloud buildup and instability in the
International Linear Collider positron damping ring. Updated optics, wiggler
magnets, and vacuum chamber designs have recently been developed for the 5 GeV,
3.2-km racetrack layout. An analysis of the synchrotron radiation profile
around the r... | 1311.2890v4 |
2013-12-18 | The behavior of transverse waves in nonuniform solar flux tubes. II. Implications for coronal loop seismology | Seismology of coronal loops using observations of damped transverse
oscillations in combination with results from theoretical models is a tool to
indirectly infer physical parameters in the solar atmospheric plasma. Existing
seismology schemes based on approximations to the period and damping time of
kink oscillations ... | 1312.5079v1 |
2014-01-02 | Quasi-Normal Modes for Subtracted Rotating and Magnetised Geometries | We obtain explicit separable solutions of the wave equation of massless
minimally coupled scalar fields in the subtracted geometry of four-dimensional
rotating and Melvin (magnetised) four-charge black holes of the STU model, a
consistent truncation of maximally supersymmetric supergravity with four types
of electromag... | 1401.0544v3 |
2014-03-12 | Enhancing robustness of multiparty quantum correlations using weak measurement | Multipartite quantum correlations are important resources for the development
of quantum information and computation protocols. However, the resourcefulness
of multipartite quantum correlations in practical settings is limited by its
fragility under decoherence due to environmental interactions. Though there
exist prot... | 1403.2939v1 |
2014-04-11 | Functional Regression for Quasar Spectra | The Lyman-alpha forest is a portion of the observed light spectrum of distant
galactic nuclei which allows us to probe remote regions of the Universe that
are otherwise inaccessible. The observed Lyman-alpha forest of a quasar light
spectrum can be modeled as a noisy realization of a smooth curve that is
affected by a ... | 1404.3168v1 |
2014-06-04 | Constraints on the gas masses of low-z damped Lyman-$α$ systems | We report a deep search for redshifted HI 21 cm emission from three damped
and sub-damped Lyman-$\alpha$ absorbers (DLAs) at $z \approx 0.1$ with the
Green Bank Telescope (GBT). No evidence for a redshifted HI 21 cm emission
signal was obtained in the GBT spectra of two absorbers, with the data on the
third rendered un... | 1406.0991v2 |
2014-06-09 | Evolution of eccentricity and orbital inclination of migrating planets in 2:1 mean motion resonance | We determine, analytically and numerically, the conditions needed for a
system of two migrating planets trapped in a 2:1 mean motion resonance to enter
an inclination-type resonance. We provide an expression for the asymptotic
equilibrium value that the eccentricity $e_{\rm i}$ of the inner planet reaches
under the com... | 1406.2189v1 |
2014-06-13 | Magnetic-Field Amplification in the Thin X-ray Rims of SN1006 | Several young supernova remnants (SNRs), including SN1006, emit synchrotron
X-rays in narrow filaments, hereafter thin rims, along their periphery. The
widths of these rims imply 50 to 100 $\mu$G fields in the region immediately
behind the shock, far larger than expected for the interstellar medium
compressed by unmodi... | 1406.3630v2 |
2014-07-02 | Spin Waves in Ferromagnetic Insulators Coupled via a Normal Metal | Herein, we study the spin-wave dispersion and dissipation in a ferromagnetic
insulator--normal metal--ferromagnetic insulator system. Long-range dynamic
coupling because of spin pumping and spin transfer lead to collective magnetic
excitations in the two thin-film ferromagnets. In addition, the dynamic dipolar
field co... | 1407.0635v1 |
2014-07-15 | C$ν$B damping of primordial gravitational waves and the fine-tuning of the C$γ$B temperature anisotropy | Damping of primordial gravitational waves due to the anisotropic stress
contribution owing to the cosmological neutrino background (C$\nu$B) is
investigated in the context of a radiation-to-matter dominated Universe.
Besides its inherent effects on the gravitational wave propagation, the
inclusion of the C$\nu$B anisot... | 1407.4058v1 |
2014-08-08 | Stable Magnetic Droplet Solitons in Spin Transfer Nanocontacts | Magnetic thin films with perpendicular magnetic anisotropy (PMA) have
localized excitations that correspond to reversed dynamically precessing
magnetic moments, known as magnetic droplet solitons. Fundamentally, these
excitations are associated with an attractive interaction between elementary
spin-excitations (i.e., m... | 1408.1902v1 |
2014-08-19 | Probing Electron Interactions in a Two-Dimensional System by Quantum Magneto-Oscillations | We have experimentally studied the renormalized effective mass m* and Dingle
temperature T_D in two spin subbands with essentially different electron
populations. Firstly, we found that the product (m*T_D) that determines damping
of quantum oscillations, to the first approximation, is the same in the
majority and minor... | 1408.4393v1 |
2014-09-30 | Collective modes in two- and three-dimensional electron systems with Rashba spin-orbit coupling | In addition to charge plasmons, a 2D electron system with Rashba-type
spin-orbit coupling (SOC) also supports three collective modes in the spin
sector: the chiral-spin modes. We study the dispersions of the charge and spin
modes and their coupling to each other within a generalized Random Phase
Approximation for arbit... | 1409.8666v1 |
2014-11-15 | Spin-transfer-torque through antiferromagnetic IrMn | Spin-transfer-torque, a transfer of angular momentum between the electron
spin and the local magnetic moments, is a promising and key mechanism to
control ferromagnetic materials in modern spintronic devices . However, much
less attention has been paid to the same effect in antiferromagnets. For the
sake of investigati... | 1411.4100v4 |
2014-11-28 | On damped second-order gradient systems | Using small deformations of the total energy, as introduced in [31], we
establish that damped second order gradient systems
$$u^{\prime\prime}(t)+\gamma u^\prime(t)+\nabla G(u(t))=0,$$may be viewed as
quasi-gradient systems. In order to study the asymptotic behavior of these
systems, we prove that any (nontrivial) desi... | 1411.8005v5 |
2014-12-08 | Variable frequency characterization of interaction at nanoscale in linear dynamic AFM: an FFM primer | Using electrostatic coupling between an AFM tip and a metallic surface as a
test interaction, we here present the measurement of the force between the tip
and the surface, together with the measurement of the interaction stiffness and
the associated dissipation. These three quantities constitute a full
characterization... | 1412.2640v1 |
2015-01-12 | Standing Slow MHD Waves in Radiatively Cooling Coronal Loops | The standing slow magneto-acoustic oscillations in cooling coronal loops are
investigated. There are two damping mechanisms which are considered to generate
the standing acoustic modes in coronal magnetic loops namely thermal conduction
and radiation. The background temperature is assumed to change temporally due
to op... | 1501.02689v1 |
2015-01-12 | Beta decay of 252Cf on the way to scission from the exit point | Upon increasing significantly the nuclear elongation, the beta-decay energy
grows. This paper investigates within a simple yet partly microscopic approach,
the transition rate of the beta decay of the 252Cf nucleus on the way to
scission from the exit point for a spontaneous fission process. A rather crude
classical ap... | 1501.02701v1 |
2015-01-13 | Fundamental oscillation modes of neutron stars: validity of universal relations | We study the $f$-mode frequencies and damping times of nonrotating neutron
stars (NS) in general relativity (GR) by solving the linearized perturbation
equations, with the aim to establish "universal" relations that depend only
weakly on the equations of state (EOS). Using a more comprehensive set of EOSs,
we re-examin... | 1501.02970v2 |
2015-02-13 | Magnetohydrodynamic kink waves in nonuniform solar flux tubes: phase mixing and energy cascade to small scales | Magnetohydrodynamic (MHD) kink waves are ubiquitously observed in the solar
atmosphere. The propagation and damping of these waves may play relevant roles
for the transport and dissipation of energy in the solar atmospheric medium.
However, in the atmospheric plasma dissipation of transverse MHD wave energy by
viscosit... | 1502.03949v1 |
2015-03-25 | Wave Propagation at Oblique Shocks: How Did Tycho Get Its Stripes? | We describe a new model for the "stripes" of synchrotron radiation seen in
the remnant of Tycho's supernova. In our picture, cosmic rays streaming ahead
of the forward shock generate parallel (with respect to the local magnetic
field direction) circularly polarized Alfven waves that are almost free of
dissipation, and ... | 1503.07497v1 |
2015-03-30 | Superradiance and instability of small rotating charged AdS black holes in all dimensions | Rotating small AdS black holes exhibit the superradiant instability to
low-frequency scalar perturbations, which is amenable to a complete analytic
description in four dimensions. In this paper, we extend this description to
all higher dimensions, focusing on slowly rotating charged AdS black holes with
a single angula... | 1503.08607v2 |
2015-04-12 | Evolution of Kinetic and Magnetic Energy in Intra Cluster Media | Intra Cluster Media (ICMs) located at galaxy clusters is in the state of hot,
tenuous, magnetized, and highly ionized X-ray emitting plasmas. This overall
collisionless, viscous, and conductive magnetohydrodynamic (MHD) turbulence in
ICM is simulated using hyper and physical magnetic diffusivity. The results
show that ... | 1504.02940v3 |
2015-04-17 | Effective Action for Cosmological Scalar Fields at Finite Temperature | Scalar fields appear in many theories beyond the Standard Model of particle
physics. In the early universe, they are exposed to extreme conditions,
including high temperature and rapid cosmic expansion. Understanding their
behavior in this environment is crucial to understand the implications for
cosmology. We calculat... | 1504.04444v2 |
2015-05-19 | The elusive HI-> H2 transition in high-z damped Lyman-alpha systems | We study the H2 molecular content in high redshift damped Lyman-alpha systems
(DLAs) as a function of the HI column density. We find a significant increase
of the H2 molecular content around log N(HI) (cm^-2)~21.5-22, a regime unprobed
until now in intervening DLAs, beyond which the majority of systems have log
N(H2) >... | 1505.04997v1 |
2015-06-11 | Dynamics near the subcritical transition of the 3D Couette flow I: Below threshold case | We study small disturbances to the periodic, plane Couette flow in the 3D
incompressible Navier-Stokes equations at high Reynolds number $\textbf{Re}$.
We prove that for sufficiently regular initial data of size $\epsilon \leq
c_0\textbf{Re}^{-1}$ for some universal $c_0 > 0$, the solution is global,
remains within $O(... | 1506.03720v1 |
2015-06-12 | Casimir Friction Between Polarizable Particle and Half-Space with Radiation Damping and Image Damping at Zero Temperature | Casimir friction between a polarizable particle and a semi-infinite space is
a delicate physical phenomenon, as it concerns the interaction between a
microscopic quantum particle and a semi-infinite reservoir. Not unexpectedly,
results obtained in the past about the friction force obtained via different
routes are some... | 1506.03937v2 |
2015-07-08 | Periods and damping rates of fast sausage oscillations in multi-shelled coronal loops | Standing sausage modes are important in interpreting quasi-periodic
pulsations in the lightcurves of solar flares. Their periods and damping times
play an important role in seismologically diagnosing key parameters like the
magnetic field strength in regions where flare energy is released. Usually such
applications are... | 1507.02169v1 |
2015-07-23 | Asteroseismology of rapidly rotating neutron stars - an alternative approach | In the present paper we examine gravitational wave asteroseismology relations
for f-modes of rapidly rotating neutron stars. An approach different to the
previous studies is employed - first, the moment of inertia is used instead of
the stellar radius, and second, the normalization of the oscillation
frequencies and da... | 1507.06606v1 |
2015-07-31 | Eccentricity Evolution Through Accretion of Protoplanets | Most of super-Earths detected by the radial velocity (RV) method have
significantly smaller eccentricities than the eccentricities corresponding to
velocity dispersion equal to their surface escape velocity ("escape
eccentricities"). If orbital instability followed by giant impacts among
protoplanets that have migrated... | 1507.08809v1 |
2015-08-25 | Effects of inertia on the steady-shear rheology of disordered solids | We study the finite-shear-rate rheology of disordered solids by means of
molecular dynamics simulations in two dimensions. By systematically varying the
damping magnitude $\zeta$ in the low-temperature limit, we identify two well
defined flow regimes, separated by a thin (temperature-dependent) crossover
region. In the... | 1508.06067v3 |
2015-09-01 | Persistence of a Non-Equilibrium State: Observation of a Boltzmannian Special Case | Well before the atomistic nature of matter was experimentally established,
Ludwig Boltzmann's audacious effort to explain the macroscopic world of human
experience in terms of the workings of an unseen microscopic world met with
vigorous opposition. A contentious point was the problem of irreversibility:
the microscopi... | 1509.00366v1 |
2015-09-14 | Nonlinear Energetic Particle Transport in the Presence of Multiple Alfvenic Waves in ITER | This work presents the results of a multi mode ITER study on Toroidal Alfven
Eigenmodes, using the nonlinear hybrid HAGIS-LIGKA model. It is found that main
conclusions from earlier studies of ASDEX Upgrade discharges can be transferred
to the ITER scenario: global, nonlinear effects are crucial for the evolution
of th... | 1509.04010v1 |
2015-09-30 | Dynamic Quantum Tomography Model for Phase-Damping Channels | In this article we propose a dynamic quantum tomography model for open
quantum systems with evolution given by phase-damping channels. Mathematically,
these channels correspond to completely positive trace-preserving maps defined
by the Hadamard product of the initial density matrix with a time-dependent
matrix which c... | 1509.09318v3 |
2015-10-24 | Propagation of GeV neutrinos through Earth | We have studied the Earth matter effect on the oscillation of upward going
GeV neutrinos by taking into account the three active neutrino flavors. For
neutrino energy in the range 3 to 12 GeV we observed three distinct resonant
peaks for the oscillation process $\nu_e\leftrightarrow \nu_{\mu,\tau}$ in
three \textit{dis... | 1510.07103v2 |
2015-11-18 | Surface waves propagation on a turbulent flow forced electromagnetically | We study the propagation of monochromatic surface waves on a turbulent flow.
The flow is generated in a layer of liquid metal by an electromagnetic forcing.
This forcing creates a quasi two-dimensional (2D) turbulence with strong
vertical vorticity. The turbulent flow contains much more energy than the
surface waves. I... | 1511.05900v1 |
2015-12-15 | Correlations between compositions and orbits established by the giant impact era of planet formation | The giant impact phase of terrestrial planet formation establishes
connections between super-Earths' orbital properties (semimajor axis spacings,
eccentricities, mutual inclinations) and interior compositions (the presence or
absence of gaseous envelopes). Using N-body simulations and analytic arguments,
we show that s... | 1512.04951v2 |
2015-12-18 | Seismic waves damping with arrays of inertial resonators | We investigate the elastic stop band properties of a theoretical cubic array
of iron spheres connected to a bulk of concrete via iron or rubber ligaments.
Each sphere can move freely within a surrounding air cavity, but ligaments
couple it to the bulk and further facilitate bending and rotational motions.
Associated lo... | 1512.06078v2 |
2016-01-08 | Kinetic Simulation of Slow Magnetosonic Waves and Quasi-periodic Upflows in the Solar Corona | Quasi-periodic disturbances of emission-line parameters are frequently
observed in the corona. These disturbances propagate upward along the magnetic
field with speeds $\sim100~\rm{km~s}^{-1}$. This phenomenon has been
interpreted as evidence of the propagation of slow magnetosonic waves or argued
to be signature of th... | 1601.01823v1 |
2016-01-25 | Comprehensive evaluation of the linear stability of Alfvén eigenmodes driven by alpha particles in an ITER baseline scenario | The linear stability of Alfv\'en eigenmodes in the presence of fusion-born
alpha particles is thoroughly assessed for two variants of an ITER baseline
scenario, which differ significantly in their core and pedestal temperatures. A
systematic approach is used that considers all possible eigenmodes for a given
magnetic e... | 1601.06621v1 |
2016-01-27 | Flash ionisation signature in coherent cyclotron emission from Brown Dwarfs | Brown dwarfs form mineral clouds in their atmospheres, where charged
particles can produce large-scale discharges in form of lightning resulting in
a substantial sudden increase of local ionisation. Brown dwarfs are observed to
emit cyclotron radio emission. We show that signatures of strong transient
atmospheric ionis... | 1601.07474v1 |
2016-02-02 | Sudden-quench dynamics of Bardeen-Cooper-Schrieffer states in deep optical lattices | We determine the exact dynamics of an initial Bardeen-Cooper-Schrieffer (BCS)
state of ultra-cold atoms in a deep hexagonal optical lattice. The dynamical
evolution is triggered by a quench of the lattice potential, such that the
interaction strength $U_f$ is much larger than the hopping amplitude $J_f$. The
quench ini... | 1602.00979v2 |
2016-03-09 | Conclusive Identification of Quantum Channels via Monogamy of Quantum Correlations | We investigate the action of local and global noise on monogamy of quantum
correlations, when monogamy scores are considered as observables, and
three-qubit systems are subjected to global noise and various local noisy
channels, namely, amplitude-damping, phase-damping, and depolarizing channels.
We show that the dynam... | 1603.02801v3 |
2016-05-05 | Electromagnetic fields in the exterior of an oscillating relativistic star -- II. Electromagnetic damping | An important issue in the asteroseismology of compact and magnetized stars is
the determination of the dissipation mechanism which is most efficient in
damping the oscillations when these are produced. In a linear regime and for
low-multipolarity modes these mechanisms are confined to either
gravitational-wave or elect... | 1605.01709v1 |
2016-05-22 | Low Gilbert damping in Co2FeSi and Fe2CoSi films | Thin highly textured Fe$_{\mathrm{1+x}}$Co$_{\mathrm{2-x}}$Si ($0 \leq$ x
$\leq 1$) films were prepared on MgO (001) substrates by magnetron
co-sputtering. The magneto-optic Kerr effect (MOKE) and ferromagnetic resonance
(FMR) measurements were used to investigate the composition dependence of the
magnetization, the ma... | 1605.06797v1 |
2016-06-14 | Landau damping to partially locked states in the Kuramoto model | In the Kuramoto model of globally coupled oscillators, partially locked
states (PLS) are stationary solutions that incorporate the emergence of partial
synchrony when the interaction strength increases. While PLS have long been
considered, existing results on their stability are limited to neutral
stability of the line... | 1606.04470v1 |
2016-07-20 | Electromagnon in the Z-type hexaferrite $({\rm Ba}_{x}{\rm Sr}_{1-x})_3\rm Co_2Fe_{24}O_{41}$ | We studied experimentally the high-temperature magnetoelectric $({\rm
Ba}_{x}{\rm Sr}_{1-x})_3\rm Co_2Fe_{24}O_{41}$ prepared as ceramics (x = 0,
0.2) and a single crystal (x = 0.5) using inelastic neutron scattering, THz
time-domain, Raman and far-infrared spectroscopies. The spectra, measured with
varying temperature... | 1607.05878v1 |
2016-07-28 | Damping of the Milky Way bar by manifold-driven spirals | We describe a new phenomenon of `bar damping' that may have played an
important role in shaping the Milky Way bar and bulge as well as its spiral
structure. We use a collisionless N-body simulation of a Milky Way-like galaxy
initially composed of a dark matter halo and an exponential disk with Toomre
parameter slightly... | 1607.08339v2 |
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