Central charges, elliptic genera, and Bekenstein-Hawking entropy in $\mathcal{N}=(2,2)$ AdS$_3$/CFT$_2$

TL;DR

This paper explores the AdS3/CFT2 duality with $ =(2,2)$ supersymmetry, proposing orbifold D1-D5 systems that match bulk supergravity predictions and explain black hole entropy microscopically.

Contribution

It introduces orbifold D1-D5 systems for $ =(2,2)$ dualities, connecting boundary CFTs to bulk quantum corrections and black hole entropy calculations.

Findings

Matching subleading central charges with supergravity predictions

Elliptic genus calculations explain Bekenstein-Hawking entropy

Logarithmic corrections to black brane entropy derived

Abstract

We consider $\mathcal{N}=(2,2)$ AdS$_3$/CFT$_2$ dualities proposed in the large central charge limit ($c\to\infty$) by Eberhardt. Here we propose the associated D1-D5 systems to be orbifolds of the standard $\mathcal{N}=(4,4)$ systems, thereby elevating the dualities to the finite-$c$ level on the boundary and to the quantum level in the bulk. In particular, we show that our brane systems yield low-energy sigma models whose subleading central charges match earlier predictions from bulk one-loop supergravity computations. In the case involving the Enriques surface, the finite-$c$ sigma model has a non-trivial elliptic genus which we use to microscopically explain both the Bekenstein-Hawking entropy and the subleading logarithmic correction to it for the associated macroscopic black brane.