Black-hole radiation, the fundamental area unit, and the spectrum of particle species

Details Black-hole radiation, the fundamental area unit, and the spectrum of particle species Black-hole radiation, the fundamental area unit, and the spectrum of particle species

2000-07-10

arxiv.org/abs/gr-qc/0007013v1

Phys.Rev. D61 (2000) 124016

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages

Scientific paper

10.1103/PhysRevD.61.124016

Bekenstein and Mukhanov have put forward the idea that, in a quantum theory of gravity a black hole should have a discrete mass spectrum with a concomitant {\it discrete} line emission. We note that a direct consequence of this intriguing prediction is that, compared with blackbody radiation, black-hole radiance is {\it less} entropic. We calculate the ratio of entropy emission rate from a quantum black hole to the rate of black-hole entropy decrease, a quantity which, according to the generalized second law (GSL) of thermodynamics, should be larger than unity. Implications of our results for the GSL, for the value of the fundamental area unit in quantum gravity, and for the spectrum of massless particles in nature are discussed.

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