Kavli Affiliate: Yasunori Nomura
| First 5 Authors: Yasunori Nomura, , , ,
| Summary:
We portray the structure of quantum gravity emerging from recent progress in
understanding the quantum mechanics of an evaporating black hole. Quantum
gravity admits two different descriptions, based on Euclidean gravitational
path integral and a unitarily evolving holographic quantum system, which appear
to present vastly different pictures under the existence of a black hole.
Nevertheless, these two descriptions are physically equivalent. Various issues
of black hole physics—including the existence of the interior, unitarity of
the evolution, the puzzle of too large interior volume, and the ensemble nature
seen in certain calculations—are addressed very differently in the two
descriptions, still leading to the same physical conclusions. The perspective
of quantum gravity developed here is expected to have broader implications
beyond black hole physics, especially for the cosmology of the eternally
inflating multiverse.
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