http://arxiv.org/abs/gr-qc/0507051(adsbygoogle = window.adsbygoogle || []).push({});

Authors: H. D. Zeh

Comments: 10 pages, 1 figure, Latex - Invited paper for a special Einstein issue of Physics Letters A

The existence of spacetime singularities is irrelevant for the irreversible appearance of black holes. However, confirmation of the latter's unitary dynamics would require the preparation of a coherent superposition of a tremendous number of appropriate ``Everett worlds''.

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# Where has all the information gone

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