3,598 research outputs found
The longlived charged massive scalar field in the higher-dimensional Reissner--Nordstr\"{o}m spacetime
The quasinormal resonance frequency of the higher-dimensional
Reissner--Nordstr\"{o}m (RN) black hole due to charged massive scalar field
perturbation is deduced analytically in the eikonal regime. The characteristic
decay timescale of the charged massive scalar perturbation in the background of
the higher-dimensional RN spacetime is then obtained. The result reveals that
longlived charged massive scalar field can exist in higher-dimensional RN
spacetime under a certain condition.Comment: 6 pages, 1 figur
Cosmological constraints from Radial Baryon Acoustic Oscillation measurements and Observational Hubble data
We use the Radial Baryon Acoustic Oscillation (RBAO) measurements, distant
type Ia supernovae (SNe Ia), the observational data (OHD) and the Cosmic
Microwave Background (CMB) shift parameter data to constrain cosmological
parameters of CDM and XCDM cosmologies and further examine the role of
OHD and SNe Ia data in cosmological constraints. We marginalize the likelihood
function over by integrating the probability density to obtain the best fitting results and the confidence regions
in the plane.With the combination analysis for
both of the {\rm }CDM and XCDM models, we find that the confidence
regions of 68.3%, 95.4% and 99.7% levels using OHD+RBAO+CMB data are in good
agreement with that of SNe Ia+RBAO+CMB data which is consistent with the result
of Lin et al's work. With more data of OHD, we can probably constrain the
cosmological parameters using OHD data instead of SNe Ia data in the future.Comment: 8 pages, 6 figures, 2 tables, accepted for publication in Physics
Letters
Effect of Earth's rotation on the trajectories of free-fall bodies in Equivalence Principle Experiment
Owing to Earth's rotation a free-fall body would move in an elliptical orbit
rather than along a straight line forward to the center of the Earth. In this
paper on the basis of the theory for spin-spin coupling between macroscopic
rotating bodies we study violation of the equivalence principle from
long-distance free-fall experiments by means of a rotating ball and a
non-rotating sell. For the free-fall time of 40 seconds, the difference between
the orbits of the two free-fall bodies is of the order of 10^{-9}cm which could
be detected by a SQUID magnetometer owing to such a magnetometer can be used to
measure displacements as small as 10^{-13} centimeters.Comment: 6 pages, 4 figure
Strong cosmic censorship for the massless Dirac field in the Reissner-Nordstrom-de Sitter spacetime
We present the Fermi story of strong cosmic censorship in the near-extremal
Reissner-Nordstrom-de Sitter black hole. To this end, we first derive from
scratch the criterion for the quasi-normal modes of Dirac field to violate
strong cosmic censorship in such a background, which turns out to be exactly
the same as those for Bose fields, although the involved energy momentum tensor
is qualitatively different from that for Bose fields. Then to extract the
low-lying quasi-normal modes by Prony method, we apply Crank-Nicolson method to
evolve our Dirac field in the double null coordinates. As a result, it shows
that for a fixed near-extremal black hole, strong cosmic censorship can be
recovered by the black hole family mode once the charge of our
Dirac field is greater than some critical value, which is increased as one
approaches the extremal black hole.Comment: JHEP published versio
Cosmological constraints on holographic dark energy models under the energy conditions
We study the holographic and agegraphic dark energy models without
interaction using the latest observational Hubble parameter data (OHD), the
Union2.1 compilation of type Ia supernovae (SNIa), and the energy conditions.
Scenarios of dark energy are distinguished by the cut-off of cosmic age,
conformal time, and event horizon. The best-fit value of matter density for the
three scenarios almost steadily located at by the joint
constraint. For the agegraphic models, they can be recovered to the standard
cosmological model when the constant which presents the fraction of dark
energy approaches to infinity. Absence of upper limit of by the joint
constraint demonstrates the recovery possibility. Using the fitted result, we
also reconstruct the current equation of state of dark energy at different
scenarios, respectively. Employing the model criteria
, we find that conformal time model is the worst,
but they can not be distinguished clearly. Comparing with the observational
constraints, we find that SEC is fulfilled at redshift with confidence level. We also find that NEC gives a meaningful
constraint for the event horizon cut-off model, especially compared with OHD
only. We note that the energy condition maybe could play an important role in
the interacting models because of different degeneracy between and
constant .Comment: 8 pages, 4 figures, accepted for publication in PR
Entropic destruction of heavy quarkonium from a deformed model
In this paper, we study the destruction of heavy quarkonium due to the
entropic force in a deformed model. The effects of the deformation
parameter on the inter-distance and the entropic force are investigated. The
influence of the deformation parameter on the quarkonium dissociation is
analyzed. It is shown that the inter-distance increases in the presence of the
deformation parameter. In addition, the deformation parameter has the effect of
decreasing the entropic force. This results imply that the quarkonium
dissociates harder in a deformed AdS background than that in an usual AdS
background, in agreement with earlier findings.Comment: 6 pages, 2 figures. Accepted by Advances in High Energy Physic
- …