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Semiclassical gravity from averaged boundaries in two-dimensional boundary conformal field theories

Kusuki, Yuya (2022) Semiclassical gravity from averaged boundaries in two-dimensional boundary conformal field theories. Physical Review D, 106 (6). Art. No. 066020. ISSN 2470-0010. doi:10.1103/physrevd.106.066020.

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The interpretation of semiclassical gravity as an ensemble-average of CFTs has provided much progress in understanding the factorization problem and the information paradox. In this article, we consider an averaging over boundary conditions in two-dimensional boundary conformal field theories (BCFTs). We show that the boundary averaging plays an important role not only in producing wormhole contributions but also in resolving the following problem. In general setups in AdS/BCFT, one can find unphysical solutions where branes have (self-)intersections. We show that the averaging nicely resolves this intersection problem. This provides another piece of evidence that averaging plays an important role in reproducing Einstein gravity. We also propose that the averaging provides a BCFT dual of the island model.

Item Type:Article
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URLURL TypeDescription
Kusuki, Yuya0000-0002-9784-0975
Additional Information:We are grateful to Nathan Benjamin, Cyuan-Han Chang, Scott Collier, Diptarka Das, Masamichi Miyaji, Takato Mori, Sridip Pal, David Simmons-Duffin, and Zixia Wei for useful discussions and comments. Y. K. is supported by Burke Fellowship (Brinson Postdoctoral Fellowship).
Group:Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Walter Burke Institute for Theoretical Physics, CaltechUNSPECIFIED
Brinson FoundationUNSPECIFIED
Issue or Number:6
Record Number:CaltechAUTHORS:20221121-712406200.9
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117944
Deposited By: Research Services Depository
Deposited On:01 Dec 2022 18:22
Last Modified:01 Dec 2022 18:22

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