Radiation from a dust dynamical LTB black hole

Details Radiation from a dust dynamical LTB black hole Radiation from a dust dynamical LTB black hole

2011-04-04

arxiv.org/abs/1104.0530v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages, revised version, accepted in Europhysics Letter

Scientific paper

Does a dynamical black hole embedded in a cosmological FRW background emit Hawking radiation where a globally defined event horizon does not exist? What are the differences to the Schwarzschild black hole? What about the first law of black hole mechanics? We face these questions using the LTB cosmological black hole model recently published. Using the Hamilton-Jacobi and radial null geodesic-methods suitable for dynamical cases, we show that it is the apparent horizon which contributes to the Hawking radiation and not the event horizon. The Hawking temperature is calculated using the two different methods giving the same result. The first law of LTB black hole dynamics and the thermal character of the radiation is also dealt with.

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