Kavli Affiliate: Yasunori Nomura
| First 5 Authors: Chitraang Murdia, Yasunori Nomura, Kyle Ritchie, ,
| Summary:
We describe two different, but equivalent semiclassical views of black hole
physics in which the equivalence principle and unitarity are both accommodated.
In one, unitarity is built-in, while the black hole interior emerges only
effectively as a collective phenomenon involving horizon (and possibly other)
degrees of freedom. In the other, more widely studied approach, the existence
of the interior is manifest, while the unitarity of the underlying dynamics can
be captured only indirectly by incorporating certain nonperturbative effects of
gravity. These two pictures correspond to a distant description and the
description based on entanglement islands/replica wormholes, respectively. We
also present a holographic description of de Sitter spacetime based on the
former approach, in which the holographic theory is located on the stretched
horizon of a static patch. We argue that the existence of these two approaches
is rooted in the two formulations of quantum mechanics: the canonical and path
integral formalisms.
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