Emergent classical spacetime from microstates of an incipient black hole
Journal Article
·
· Journal of High Energy Physics (Online)
- Univ. of Pennsylvania, Philadelphia, PA (United States); Vrije Univ. Brussel (VUB) (Belgium); University of California, Santa Barbara
- Univ. of California, Santa Barbara, CA (United States)
- Stanford Univ., CA (United States)
- Wellesley College, MA (United States)
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Univ. of Pennsylvania, Philadelphia, PA (United States); Vrije Univ. Brussel (VUB) (Belgium)
Black holes have an enormous underlying space of microstates, but universal macroscopic physics characterized by mass, charge and angular momentum as well as a causally disconnected interior. This leads two related puzzles: (1) How does the effective factorization of interior and exterior degrees of freedom emerge in gravity?, and (2) How does the underlying degeneracy of states wind up having a geometric realization in the horizon area and in properties of the singularity? We explore these puzzles in the context of an incipient black hole in the AdS/CFT correspondence, the microstates of which are dual to half-BPS states of the $$\mathcal{N}$$ = 4 super-Yang-Mills theory. First, we construct a code subspace for this black hole and show how to organize it as a tensor product of a universal macroscopic piece (describing the exterior), and a factor corresponding to the microscopic degrees of freedom (describing the interior). We then study the classical phase space and symplectic form for low-energy excitations around the black hole. On the AdS side, we find that the symplectic form has a new physical degree of freedom at the stretched horizon of the black hole, reminiscent of soft hair, which is absent in the microstates. We explicitly show how such a soft mode emerges from the microscopic phase space in the dual CFT via a canonical transformation and how it encodes partial information about the microscopic degrees of freedom of the black hole.
- Research Organization:
- Univ. of California, Santa Barbara, CA (United States)
- Sponsoring Organization:
- Simons Foundation; USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
- Grant/Contract Number:
- FG02-05ER41367; SC0011702
- OSTI ID:
- 1602251
- Journal Information:
- Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 1 Vol. 2019; ISSN 1029-8479
- Publisher:
- Springer BerlinCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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