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Black hole radiation from non-vacuum initial states

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If you have a question about this talk, please contact Xi Tong .

Hawking derived the black hole thermal radiation state by comparing the vacuum state at the future null infinity I+ with that at the past null infinity I-. We revisit Hawking’s computation, considering a non-vacuum initial state at the past of the black hole geometry. We show in which cases the black hole radiation arising from the initial matter state differs from the well-known thermal state. We moreover classify what initial states are distinguishable from one another through measurements on the black hole radiation in this framework. Finally we provide a physical interpretation of the classification, using Algebraic Quantum Field Theory localisation.

This talk is part of the DAMTP Friday GR Seminar series.

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