Black hole evaporation without information loss
Abstract
An approach to black hole quantization is proposed wherein it is assumed that quantum coherence is preserved. A consequence of this is that the Penrose diagram describing gravitational collapse will show the same topological structure as flat Minkowski space. After giving our motivations for such a quantization procedure we formulate the background field approximation, in which particles are divided into "hard" particles and "soft" particles. The background spacetime metric depends both on the instates and on the outstates. We present some model calculations and extensive discussions. In particular, we show, in the context of a toy model, that the $S$matrix describing soft particles in the hard particle background of a collapsing star is unitary, nevertheless, the spectrum of particles is shown to be approximately thermal. We also conclude that there is an important topological constraint on functional integrals.
 Publication:

Classical and Quantum Gravity
 Pub Date:
 March 1994
 DOI:
 10.1088/02649381/11/3/014
 arXiv:
 arXiv:grqc/9310006
 Bibcode:
 1994CQGra..11..621S
 Keywords:

 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory
 EPrint:
 35 pages (including Figures)