Semiclassical Gravity from Averaged Boundaries in two-dimensional BCFTs

Abstract

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.

6 pages, 4 figures, for publication

References in corpus (9)

• Universal Spectrum of 2d Conformal Field Theory in the Large c Limit
• Gravity/Ensemble Duality
• Entanglement entropy in holographic moving mirror and Page curve
• Analytic Bootstrap in 2D Boundary Conformal Field Theory: Towards Braneworld Holography
• Black holes from CFT: Universality of correlators at large c
• Page Curve from Defect Extremal Surface and Island in Higher Dimensions
• Holographic moving mirrors
• Product of Random States and Spatial (Half-)Wormholes
• Holographic Local Operator Quenches in BCFTs

Cited by in corpus (7)

• AdS/BCFT with Brane-Localized Scalar Field
• Holographic BCFT with a Defect on the End-of-the-World Brane
• AdS/BCFT from Conformal Bootstrap: Construction of Gravity with Branes and Particles
• Wormholes with Ends of the World
• Deriving the non-perturbative gravitational dual of quantum Liouville theory from BCFT operator algebra
• Encoded information of mixed correlations: the views from one dimension higher
• Holographic BCFT Spectra from Brane Mergers