BOUNDING THE GREYBODY FACTORS FOR NON-ROTATING BLACK HOLES

作者：Ngampitipan Tritos; Boonserm Petarpa^*

来源：International Journal of Modern Physics D, 2013, 22(9): 1350058.

DOI：10.1142/S0218271813500582

• Hawking radiation
• greybody factor
• bounding
• Reissner-Nordstrom black holes
• charged dilatonic black holes

Semiclassical black holes emit radiation called Hawking radiation. Such radiation, as seen by an asymptotic observer far outside the black hole, differs from the original radiation near the horizon of the black hole by a redshift factor and the so-called %26quot;greybody factor.%26quot; In this paper, we concentrate on the greybody factor; various bounds for the greybody factors of non-rotaging black holes are obtained, concentrating primarily on charged Reissner-Nordstrom (RN) and RN-de Sitter black holes. These bounds can be derived using a 2 x 2 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, it is also found that the cosmological constant can increase the emission rate of Hawking radiation.

• 出版日期2013-7