Tapas K Das 2004 Class. Quantum Grav. 21 5253 doi:10.1088/0264-9381/21/22/016
Tapas K Das
Show affiliationsWe show that spherical accretion onto astrophysical black holes can be considered as a natural example of an analogue system. We provide, for the first time, an exact analytical scheme for calculating the analogue Hawking temperature and surface gravity for general relativistic accretion onto astrophysical black holes. Our calculation may bridge the gap between the theory of transonic astrophysical accretion and the theory of analogue Hawking radiation. We show that the domination of the analogue Hawking temperature over the actual Hawking temperature may be a real astrophysical phenomenon, though observational tests of this fact will at best be difficult and at worst might prove to be impossible. We also discuss the possibilities of the emergence of analogue white holes around astrophysical black holes. Our calculation is general enough to accommodate accreting black holes with any mass.
Issue 22 (21 November 2004)
Received 27 April 2004, in final form 4 October 2004
Published 29 October 2004
Tapas K Das 2004 Class. Quantum Grav. 21 5253
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