Building blocks of a black hole

Details Building blocks of a black hole Building blocks of a black hole

2002-02-11

arxiv.org/abs/gr-qc/0202034v2

Phys.Rev. D66 (2002) 024005

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

PhysRevTeX, 14 pages

Scientific paper

10.1103/PhysRevD.66.024005

What is the nature of the energy spectrum of a black hole ? The algebraic approach to black hole quantization requires the horizon area eigenvalues to be equally spaced. As stressed long ago by by Mukhanov, such eigenvalues must be exponentially degenerate with respect to the area quantum number if one is to understand black hole entropy as reflecting degeneracy of the observable states. Here we construct the black hole states by means of a pair of "creation operators" subject to a particular simple algebra, a slight generalization of that for the harmonic oscillator. We then prove rigorously that the n-th area eigenvalue is exactly 2 raised to the n-fold degenerate. Thus black hole entropy qua logarithm of the number of states for fixed horizon area comes out proportional to that area.

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