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Unitarity and fuzzball complementarity: “Alice fuzzes but may not even know it!”

Steven G. Avery,Borun D. Chowdhury,Andrea Puhm

Published 2013 in Journal of High Energy Physics

ABSTRACT

We investigate the recent black hole firewall argument. For a black hole in a typical state we argue that unitarity requires every quantum of radiation leaving the black hole to carry information about the initial state. An information-free horizon is thus inconsistent with unitary at every step of the evaporation process. The required horizon-scale structure is manifest in the fuzzball proposal which provides a mechanism for holding up the structure. In this context we want to address the experience of an infalling observer and discuss the recent fuzzball complementarity proposal. Unlike black hole complementarity and observer complementarity which postulate asymptotic observers experience a hot membrane while infalling ones pass freely through the horizon, fuzzball complementarity postulates that fine-grained operators experience the details of the fuzzball microstate and coarse-grained operators experience the black hole. In particular, this implies that an in-falling detector tuned to energy E ~ TH, where TH is the asymptotic Hawking temperature, does not experience free infall while one tuned to E ≫ TH does.

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