353,184 research outputs found
Rotating Superconductors and the Frame-independent London Equation
A frame-independent, thermodynamically exact London equation is presented,
which is especially valid for rotating superconductors. A direct result is the
unexpectedly high accuracy () for the usual expression of the
London moment.Comment: 4 pages, 0 figure
Mass estimate of the Swift J 164449.3+573451 supermassive black hole based on the 3:2 QPO resonance hypothesis
A dormant Swift source J 164449.3+573451 (Sw 164449+57)recently experienced a
powerful outburst, caused most probably by a tidal disruption of a star by the
super-massive black hole at the center of the source. During the outburst, a
quasi periodic oscillation (QPO) was detected in the observed X-ray flux from
Sw 164449+57. We show that if the observed QPO belongs to a "3:2 twin peak QPO"
(with the second frequency not observed), the mass of the black hole in Sw
164449+57 is rather low, M ~ 10^5 M_sun, and the source belongs to a class of
intermediate mass black holes. The low mass of the source has been pointed out
previously by several authors.Comment: Accepted by Astronomy and Astrophysic
Particle Entanglement in Rotating Gases
In this paper, we investigate the particle entanglement in 2D
weakly-interacting rotating Bose and Fermi gases. We find that both particle
localization and vortex localization can be indicated by particle entanglement.
We also use particle entanglement to show the occurrence of edge reconstruction
of rotating fermions. The different properties of condensate phase and vortex
liquid phase of bosons can be reflected by particle entanglement and in vortex
liquid phase we construct a trial wave function in the viewpoint of
entanglement to relate the ground state with quantum Hall state. Finally, the
relation between particle entanglement and interaction strength is studied.Comment: 7 pages, 9 figure
The Dynamics of the Bounds of Squared Concurrence
We study the dynamics of upper and lower bounds of squared concurrence.Our
results are similar to that of Konard et al. and can help the estimation of
high-dimension bipartite entanglement in experiments.Comment: 5 pages, 2 figures accepted by PR
The Decay of Multiqudit Entanglement
We investigate the decay of entanglement of a generalized N-qudit GHZ state,
with each qudit passing through independently in a quantum noisy channel. By
studying the time at which the entanglement completely vanishes and the time at
which the entanglement becomes arbitrarily small, we try to find how the
robustness of entanglement is influenced by dimension d and the number of
particles N.Comment: 4 pages, 3 figure
Virtual Compton Scattering from the Proton and the Properties of Nucleon Excited States
We calculate the contributions to the generalized polarizabilities of
the proton in virtual Compton scattering. The following nucleon excitations are
included: , , , , ,
and . The relationship between nucleon
structure parameters, properties and the generalized polarizabilities of
the proton is illustrated.Comment: 13 pages of text (Latex) plus 4 figures (as uuencoded Z-compressed
.tar file created by csh script uufiles
Mass in anti-de Sitter spaces
The boundary stress tensor approach has proven extremely useful in defining
mass and angular momentum in asymptotically anti-de Sitter spaces with CFT
duals. An integral part of this method is the use of boundary counterterms to
regulate the gravitational action and stress tensor. In addition to the
standard gravitational counterterms, in the presence of matter we advocate the
use of a finite counterterm proportional to phi^2 (in five dimensions). We
demonstrate that this finite shift is necessary to properly reproduce the
expected mass/charge relation for R-charged black holes in AdS_5.Comment: 15 pages, late
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Development of stochastic models of window state changes in educational buildings
How people would like to interact with surrounding environment will subsequently influence indoor thermal conditions and further impact building energy performance. In order to understand occupants' adaptive behaviours in terms of environmental control utilization from the point of view of quantification, an investigation on windows operation was carried out in non-air-conditioned educational buildings in the UK during summer time considering the effects of occupant type (active and passive) and the time of a day. Outdoor air temperature was a better predictor or window operation than indoor air temperature. Window operation was found to be time-evolving event. The purpose or criteria of adjusting window states were different at different occupancy stages. Active occupants were more willing to change windows states in response to outdoor air temperature variations. Sub-models predicting transition probabilities of window state for different occupant type and occupancy stages were developed. The results derived from this field study are helpful with improving building simulation accuracy by integrating sub-models into simulation software and further providing guideline on building energy reduction without sacrificing indoor thermal comfort
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