2,895 research outputs found
Fermions Tunneling from Apparent Horizon of FRW Universe
In the paper [arXiv:0809.1554], the scalar particles' Hawking radiation from
the apparent horizon of Friedmann-Robertson-Walker(FRW) universe was
investigated by using the tunneling formalism. They obtained the Hawking
temperature associated with the apparent horizon, which was extensively applied
in investigating the relationship between the first law of thermodynamics and
Friedmann equations. In this paper, we calculate Fermions' Hawking radiation
from the apparent horizon of FRW universe via tunneling formalism. Applying WKB
approximation to the general covariant Dirac equation in FRW spacetime
background, the radiation spectrum and Hawking temperature of apparent horizon
are correctly recovered, which supports the arguments presented in the paper
[arXiv:0809.1554].Comment: 8 pages, no figure
Aripiprazole for the treatment of tic disorders in children: a systematic review and meta-analysis
Dynamical perturbations and critical phenomena in Gauss-Bonnet-AdS black holes
We investigate the perturbations of charged scalar field in -dimensional
Gauss-Bonnet AdS black hole backgrounds. From the perturbation behaviors we
obtain the objective picture on how the high curvature influence the spacetime
perturbation and the condensation of the scalar hair. The high curvature
effects can also be read from the linear response function such as the
susceptibility and the correlation length, when the system approaches the
critical point. We find that the Gauss-Bonnet term does not affect the critical
exponents of the system and they still take the mean-field values.Comment: 13 pages, 5 figures, to appear in Phys. Lett.
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