Realistic clocks, universal decoherence and the black hole information paradox

Details Realistic clocks, universal decoherence and the black hole information paradox Realistic clocks, universal decoherence and the black hole information paradox

2004-06-28

arxiv.org/abs/hep-th/0406260v1

Phys.Rev.Lett. 93 (2004) 240401

Physics

High Energy Physics

High Energy Physics - Theory

3 Pages, RevTex, no figures

Scientific paper

10.1103/PhysRevLett.93.240401

Ordinary quantum mechanics is formulated on the basis of the existence of an ideal classical clock external to the system under study. This is clearly an idealization. As emphasized originally by Salecker and Wigner and more recently by other authors, there exist limits in nature to how ``classical'' even the best possible clock can be. When one introduces realistic clocks, quantum mechanics ceases to be unitary and a fundamental mechanism of decoherence of quantum states arises. We estimate the rate of universal loss of unitarity using optimal realistic clocks. In particular we observe that the rate is rapid enough to eliminate the black hole information puzzle: all information is lost through the fundamental decoherence before the black hole can evaporate. This improves on a previous calculation we presented with a sub-optimal clock in which only part of the information was lost by the time of evaporation.

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