On string theory on (deformed) $AdS_3\times \mathbb{T}^3$

TL;DR

This paper studies fermionic string theory on deformed $AdS_3\times \mathbb{T}^3$, exploring its duality with $T\bar T$-deformed SCFTs and analyzing worldsheet operators to understand boundary theory properties.

Contribution

It provides a detailed analysis of the $k=1$ fermionic string on deformed $AdS_3\times \mathbb{T}^3$ and links worldsheet operators to boundary $T\bar T$-deformed theories.

Findings

Identification of delta-function normalizable worldsheet operators.

Reproduction of boundary theory properties from string theory.

Connection between string operators and $T\bar T$-deformed spacetime theories.

Abstract

We revisit the fermionic string theory on $AdS_3\times \mathcal{N}$ with $k=1$, and its single-trace $T\bar T$ deformation, with a focus on the $(2,2)$ superstring on (deformed) $AdS_3\times \mathbb{T}^3$. In a certain limit, it is dual to the symmetric product of the ($T\bar T$-deformed) SCFT$_2$ on $\mathbb{R}\times \mathbb{T}^3$. We present the winding-one delta-function normalizable worldsheet operators which, in the $k=1$ decoupling limit, correspond to those of $\mathbb{R}\times \mathbb{T}^3$ in spacetime. We then demonstrate how their properties in string theory reproduce those of $\mathbb{R}\times\mathbb{T}^3$, or more generally, of a ($T\bar{T}$-deformed) $\mathbb{R}\times\mathcal{N}$ seed of the boundary theory.