Microscopic Origin of the Entropy of Astrophysical Black Holes

We construct an infinite family of microstates for black holes in Minkowski spacetime which have effective semiclassical descriptions in terms of collapsing dust shells in the black hole interior. Quantum mechanical wormholes cause these states to have exponentially small, but universal, overlaps. We show that these overlaps imply that the microstates span a Hilbert space of log dimension equal to the event horizon area divided by four times the Newton constant, explaining the statistical origin of the Bekenstein-Hawking entropy.

Note:

9 pages, 4 figures. v3: minor edits, discussion section added

black hole: entropy
space-time: Minkowski
gravitation: fundamental constant
overlap
microstate
collapse
family
Hilbert space
wormhole
horizon

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