Quantum Gravity and Non-unitarity in Black Hole Evaporation

Details Quantum Gravity and Non-unitarity in Black Hole Evaporation Quantum Gravity and Non-unitarity in Black Hole Evaporation

1993-08-23

arxiv.org/abs/gr-qc/9308024v1

Mod.Phys.Lett.A9:2661-2670,1994

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

6 pages, Latex, ZU-TH 25/93

Scientific paper

10.1142/S0217732394002501

We discuss the relevance of quantum gravitational corrections to the functional Schr\"odinger equation for the information loss paradox in black hole evaporation. These corrections are found from the Wheeler-DeWitt equation through a semiclassical expansion scheme. The dominant contribution in the final evaporation stage, when the black hole approaches the Planck regime, is a term which explicitly violates unitarity in the non-gravitational sector. While pure states remain pure, there is an increase in the degree of purity for non-pure states in this sector. This result holds irrespective of whether full quantum gravity respects unitarity or not.

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