AdS${}_3$ gravity and the complex SYK models

Abstract

We provide a non conformal generalization of the Compère-Song-Strominger (CSS) boundary conditions for AdS${}_3$ gravity that breaks the $\hat{u}(1)$ Kac-Moody-Virasoro symmetry to two $u(1)$s. The holographic dual specified by the new boundary conditions can be understood as an irrelevant deformation of a warped conformal field theory (WCFT). Upon consistent reduction to two dimensions, AdS${}_3$ gravity results in a deformed Jackiw-Teitelboim dilaton gravity model coupled to a Maxwell field. We show that near extremality the boundary conditions inherited from generalized CSS boundary conditions in three dimensions give rise to an effective action exhibiting the same symmetry breaking pattern as the complex Sachdev-Ye-Kitaev models. Besides the Schwarzian term reflecting the breaking of conformal symmetry, the effective action contains an additional term that captures the breaking of the $\hat{u}(1)$ Kac-Moody symmetry.

arXiv comment49 pages, 1 figure; v2 minor corrections and additions. Version to appear in JHEP

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