5,646 research outputs found
Black hole entropy arising from massless scalar field with Lorentz violation induced by the coupling to Einstein tensor
We have investigated quantum entropy of a static black hole arising from the
massless scalar field with Lorentz violation induced by the coupling to
Einstein tensor. Our results show that the coupled massless scalar field
contributes to the classical Bekenstein-Hawking term in the black hole entropy.
The corrected classical Bekenstein-Hawking entropy is not one quarter of the
event horizon area of the original background black hole, but of a
corresponding effective metric related to the coupling. It means that the
classical Bekenstein-Hawking entropy depends not only on the black hole
parameter, but also on the coupling which reduces Lorentz violation.Comment: 5 pages, no figure. Accepted by PLB for publicatio
Absorption cross section and Hawking radiation of the electromagnetic field with Weyl corrections
We have investigated the absorption cross section and the Hawking radiation
of electromagnetic field with Weyl correction in the background of a
four-dimensional Schwarzschild black hole spacetime. Our results show that the
properties of the absorption cross section and the Hawking radiation depend not
only on the Weyl correction parameter, but also on the parity of the
electromagnetic field, which is quite different from those of the usual
electromagnetic field without Weyl correction in the four-dimensional
spacetime. With increase of Weyl correction parameter, the absorption
probability, the absorption cross section, the power emission spectra and the
luminosity of Hawking radiation decreases with Weyl correction parameter for
the odd-parity electromagnetic field and increases with the event-parity
electromagnetic field.Comment: 10 pages, 8 figures. Accepted for publication in Physics Letters
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