Alpha states demystified — towards microscopic models of AdS2 holography

A bstract We continue our study of factorizing theories of dilaton gravity, characterized by a universal bilocal interaction. All such factorizing theories can be shown to have discrete spectra, distinguished only by their local dilaton potentials. We show how such theories can be used to construct...

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Bibliographic Details
Published in:	The journal of high energy physics 2022-08, Vol.2022 (8), p.71-52, Article 71
Main Authors:	Blommaert, Andreas, Iliesiu, Luca V., Kruthoff, Jorrit
Format:	Article
Language:	eng
Subjects:	2D Gravity AdS-CFT Correspondence Black holes Classical and Quantum Gravitation Dilatons Elementary Particles Equivalence High energy physics Hilbert space Holography Mechanical systems Physics Physics and Astronomy Quantum Field Theories Quantum Field Theory Quantum gravity Quantum mechanics Quantum Physics Regular Article - Theoretical Physics Relativity Theory Spectra String Theory
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Summary:	A bstract We continue our study of factorizing theories of dilaton gravity, characterized by a universal bilocal interaction. All such factorizing theories can be shown to have discrete spectra, distinguished only by their local dilaton potentials. We show how such theories can be used to construct all alpha-states in the Hilbert space of baby universes of ordinary JT gravity. Large classes of these theories with different local potentials are found to be non-perturbatively equivalent and have identical discrete spectra. This is a concrete example of how different bulk descriptions can give rise to the same boundary theory. Such equivalences manifest themselves as null states, which have to be quotiented out in order to construct a proper baby universe Hilbert space. Our results also allow us to revisit the mechanism discussed by Coleman, Giddings and Strominger and concretely link ensemble averaging to the appearance or disappearance of spacetime wormholes. We then investigate JT gravity deformed only by the universal bilocal interaction. In this theory, the only terms that do not cancel in a topological expansion are disks, which capture perturbative fluctuations around a two-dimensional black hole saddle. We find that this theory of black holes has an evenly spaced spectrum, instead of a quantum chaotic one. We present a dual quantum mechanical system with exactly the same discrete spectrum, and propose that this is an example of a new holographic duality between a two-dimensional theory of quantum gravity and a conventional quantum mechanics.
ISSN:	1029-8479 1029-8479