Nonviolent nonlocality

If quantum mechanics governs nature, black holes must evolve unitarily, providing a powerful constraint on the dynamics of quantum gravity. Such evolution apparently must in particular be nonlocal, when described from the usual semiclassical geometric picture, in order to transfer quantum information into the outgoing state. While such transfer from a disintegrating black hole has the dangerous potential to be violent to generic infalling observers, this paper proposes the existence of a more innocuous form of information transfer, to relatively soft modes in the black hole atmosphere. Simplified models for such nonlocal transfer are described and parameterized, within a possibly more basic framework of networked Hilbert spaces. Sufficiently sensitive measurements by infalling observers may detect departures from Hawking’s predictions, and in generic models black holes decay more rapidly. Constraints of consistency—internally and with known and expected features of physics—restrict the form of information transfer, and should provide important guides to discovery of the principles and mechanisms of the more fundamental nonlocal mechanics.

Note:

15 pages of text w/ 3 figures. v2: improved references, short comment re parametric dependence v3: minor changes/corrections, matching version to appear in PRD

04.70.Dy
03.67.Bg
03.67.-a
04.60.-m
black hole: model
black hole: decay
nonlocal
mechanics
unitarity
black hole: information theory

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