Black hole physics and the universalities of superradiance and of grey-body radiation
- Instituto de matematica, Campinas (Brazil)
In this essay the authors compare the response of a black hole to incoming radiation to that of a system consisting of a hot source hidden behind a semi-transparent mirror, and the two happen to agree. Then, they display a thermodynamical proof showing that this agreement is not incidental: it is a universal feature of an ideal grey body. As a by-product of this argument the universality of superradiance emerges: absorptive media in rotation, instead of damping incoming radiation, are responsible for its amplification for all superradiant modes. The main conclusion here is that the black hole response to incoming radiation and superandiance are not features that arise because black holes are {open_quotes}exceptional{close_quotes} systems but, on the contrary, because they are very {open_quotes}ordinary{close_quotes} in the sense that they fall into the category of ideal grey bodies.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 54554
- Journal Information:
- General Relativity and Gravitation, Vol. 27, Issue 1; Other Information: PBD: Jan 1995
- Country of Publication:
- United States
- Language:
- English
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