Bounding the Greybody Factors for Non-rotating Black Holes

Abstract

Semiclassical black holes emit radiation called Hawking radiation. Such radiation, as seen by an asymptotic observer far outside the black hole, differs from original radiation near the horizon of the black hole by a redshift factor and the so-called "greybody factor". In this paper, we concentrate on the greybody factor-various bounds for the greybody factors of non-rotating black holes are obtained, concentrating on charged Reissner-Nordstrom and Reissner-Nordstrom-de Sitter black holes. These bounds can be derived by using a 2x2 transfer matrix formalism. It is found that the charges of black holes act as efficient barriers. Furthermore, adding extra dimensions to spacetime can shield Hawking radiation. Finally, the cosmological constant can increase the emission rate of Hawking radiation.

21 pages, 11 figures

References in corpus (5)

• Bounding the greybody factors for Schwarzschild black holes
• Hawking emission from quantum gravity black holes
• Greybody factors at large imaginary frequencies
• Absorption cross section of RN black hole
• Extension of non-minimal derivative coupling theory and Hawking radiation in black-hole spacetime

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