174,823 research outputs found
Stochastic electron heating in the laser and quasi-static electric and magnetic fields
The dynamics of relativistic electrons in the intense laser radiation and
quasi-static electromagnetic fields both along and across to the laser
propagating direction are studied in the 3/2 dimensional Hamiltonian framework.
It is shown that the unperturbed oscillations of the relativistic electron in
these electric fields could exhibit a long tail of harmonics which makes an
onset of stochastic electron motion be a primary candidate for electron
heating. The Poincar\'e mappings describing the electron motions in the laser
and electric fields only are derived from which the criterions for instability
are obtained. It follows that for both transverse and longitudinal electric
fields, there exist upper limits of the stochastic electron energy depending on
the laser intensity and electric field strength. Specifically, these maximum
stochastic energies are enhanced by a strong laser intensity but weak electric
field. Such stochastic heating would be reduced by the superluminal phase
velocity in both cases. The impacts of the magnetic fields on the electron
dynamics are different for these two cases and discussed qualitatively. These
analytic results are confirmed by the numerical simulations of solving the 3/2D
Hamiltonian equations directly
RKKY Interaction in Graphene from Lattice Green's Function
We study the exchange interaction between two magnetic impurities in
graphene (the RKKY interaction) by directly computing the lattice Green's
function for the tight-binding band structure for the honeycomb lattice. The
method allows us to compute numerically for much larger distances than can
be handled by finite-lattice calculations as well as for small distances. %
avoids the use of a cutoff function often invoked in the literature to curtail
the diverging contributions from the linear bands and yields results that are
valid for all distances. In addition, we rederive the analytical long-distance
behavior of for linearly dispersive bands and find corrections to the
oscillatory factor that were previously missed in the literature. The main
features of the RKKY interaction in graphene are that unlike the behavior of an ordinary 2D metal in the
long-distance limit, in graphene falls off as , shows the -type oscillations with additional phase factors depending on the
direction, and exhibits a ferromagnetic interaction for moments on the same
sublattice and an antiferromagnetic interaction for moments on the opposite
sublattices as required by particle-hole symmetry. The computed with the
full band structure agrees with our analytical results in the long-distance
limit including the oscillatory factors with the additional phases.Comment: 8 pages, 11 figure
The Picard group of the loop space of the Riemann sphere
The loop space of the Riemann sphere consisting of all C^k or Sobolev W^{k,p}
maps from the circle S^1 to the sphere is an infinite dimensional complex
manifold. We compute the Picard group of holomorphic line bundles on this loop
space as an infinite dimensional complex Lie group with Lie algebra the first
Dolbeault group. The group of Mobius transformations G and its loop group LG
act on this loop space. We prove that an element of the Picard group is
LG-fixed if it is G-fixed; thus completely answer the question by Millson and
Zombro about G-equivariant projective embedding of the loop space of the
Riemann sphere.Comment: International Journal of Mathematic
Linkages between Shanghai and Hong Kong stock indices
This paper examines the dynamics of the linkages between Shang- hai and Hong Kong stock indices. While the volatility linkage is anal- ysed by a multivariate GARCH framework, the linkage of returns is examined using a copula approach. Eight different copula functions are applied in this study including two time-varying copulas which capture the time varying process of the linkage. The results show sig- nificant tail dependence of the returns in the two markets.
On the Impact of Entity Linking in Microblog Real-Time Filtering
Microblogging is a model of content sharing in which the temporal locality of
posts with respect to important events, either of foreseeable or unforeseeable
nature, makes applica- tions of real-time filtering of great practical
interest. We propose the use of Entity Linking (EL) in order to improve the
retrieval effectiveness, by enriching the representation of microblog posts and
filtering queries. EL is the process of recognizing in an unstructured text the
mention of relevant entities described in a knowledge base. EL of short pieces
of text is a difficult task, but it is also a scenario in which the information
EL adds to the text can have a substantial impact on the retrieval process. We
implement a start-of-the-art filtering method, based on the best systems from
the TREC Microblog track realtime adhoc retrieval and filtering tasks , and
extend it with a Wikipedia-based EL method. Results show that the use of EL
significantly improves over non-EL based versions of the filtering methods.Comment: 6 pages, 1 figure, 1 table. SAC 2015, Salamanca, Spain - April 13 -
17, 201
Analytic continuation of single-particle resonance energy and wave function in relativistic mean field theory
Single-particle resonant states in spherical nuclei are studied by an
analytic continuation in the coupling constant (ACCC) method within the
framework of the self-consistent relativistic mean field (RMF) theory. Taking
the neutron resonant state in Ca as an example, we
examine the analyticity of the eigenvalue and eigenfunction for the Dirac
equation with respect to the coupling constant by means of a \pade
approximant of the second kind. The RMF-ACCC approach is then applied to
Zr and, for the first time, this approach is employed to investigate
both the energies, widths and wave functions for resonant states close
to the continuum threshold. Predictions are also compared with corresponding
results obtained from the scattering phase shift method.Comment: 19 pages, 9 figure
Study of Proton Magic Even-Even Isotopes and Giant Halos of Ca Isotopes with Relativistic Continuum Hartree-Bogoliubov Theory
We study the proton magic O, Ca, Ni, Zr, Sn, and Pb isotope chains from the
proton drip line to the neutron drip line with the relativistic continuum
Hartree-Bogoliubov (RCHB) theory. Particulary, we study in detail the
properties of even-even Ca isotopes due to the appearance of giant halos in
neutron rich Ca nuclei near the neutron drip line. The RCHB theory is able to
reproduce the experimental binding energies and two neutron separation
energies very well. The predicted neutron drip line nuclei are
O, Ca, Ni, Zr, Sn, and Pb,
respectively. Halo and giant halo properties predicted in Ca isotopes with
are investigated in detail from the analysis of two neutron separation
energies, nucleon density distributions, single particle energy levels, the
occupation probabilities of energy levels including continuum states. The
spin-orbit splitting and the diffuseness of nuclear potential in these Ca
isotopes are studied also. Furthermore, we study the neighboring lighter
isotopes in the drip line Ca region and find some possibility of giant halo
nuclei in the Ne-Na-Mg drip line nuclei.Comment: 45 pages, 20 figure
Distributed Deep Learning for Question Answering
This paper is an empirical study of the distributed deep learning for
question answering subtasks: answer selection and question classification.
Comparison studies of SGD, MSGD, ADADELTA, ADAGRAD, ADAM/ADAMAX, RMSPROP,
DOWNPOUR and EASGD/EAMSGD algorithms have been presented. Experimental results
show that the distributed framework based on the message passing interface can
accelerate the convergence speed at a sublinear scale. This paper demonstrates
the importance of distributed training. For example, with 48 workers, a 24x
speedup is achievable for the answer selection task and running time is
decreased from 138.2 hours to 5.81 hours, which will increase the productivity
significantly.Comment: This paper will appear in the Proceeding of The 25th ACM
International Conference on Information and Knowledge Management (CIKM 2016),
Indianapolis, US
- …