Black hole evaporation without information loss

@article{Stephens1994BlackHE,
  title={Black hole evaporation without information loss},
  author={Christopher R. Stephens and Gerard 't Hooft and Bernard F Whiting},
  journal={Classical and Quantum Gravity},
  year={1994},
  volume={11},
  pages={621-647}
}
An approach to black hole quantization is proposed wherein it is assumed that quantum coherence is preserved. 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 in-states and on the out-states. A consequence of our approach is that four-geometries describing gravitational collapse will show the same… 

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