On the Origin of Black Hole Evaporation Radiation
Abstract
The physical basis underlying the black hole evaporation process is clarified by a calculation of the expectation value of the energymomentum tensor for a massless scalar field in a completely general two dimensional collapse scenario. It is found that radiation is produced inside the collapsing matter which propagates both inwards and outwards. The ingoing component eventually emerges from the star after travelling through the centre. The outgoing energy flux appears at infinity as the evaporation radiation discovered by Hawking. At late times, outside the star, the former component fades out exponentially, and the latter component approaches a value which is independent of the details of the collapse process. In the special case of a collapsing hollow, thin shell of matter, all the radiation is produced at the shell. These results are independent of regularization ambiguities, which enter only the static vacuum polarization terms in the energymomentum tensor. The significance of an earlier remark about black hole explosions is discussed in the light of these results.
 Publication:

Proceedings of the Royal Society of London Series A
 Pub Date:
 October 1976
 DOI:
 10.1098/rspa.1976.0133
 Bibcode:
 1976RSPSA.351..129D
 Keywords:

 Black Holes (Astronomy);
 Evaporation;
 Gravitational Collapse;
 Stellar Evolution;
 Astronomical Models;
 Energy Dissipation;
 Metric Space;
 Stellar Models;
 Stellar Radiation;
 Tensor Analysis;
 Astrophysics;
 BLACK HOLES (ASTRONOMY);
 EVAPORATION;
 GRAVITATIONAL COLLAPSE;
 STELLAR EVOLUTION;
 ASTRONOMICAL MODELS;
 ENERGY DISSIPATION;
 METRIC SPACE;
 STELLAR MODELS;
 STELLAR RADIATION;
 TENSOR ANALYSIS