$T\bar{T}/J\bar{T}$-deformed WZW models from Chern-Simons AdS$_3$ gravity with mixed boundary conditions

TL;DR

This paper derives $Tar{T}$ and $Jar{T}$-deformed WZW models from AdS$_3$ gravity with mixed boundary conditions using Chern-Simons formalism, establishing a holographic correspondence with deformed boundary CFTs.

Contribution

It constructs the $Tar{T}$ and $Jar{T}$-deformed WZW models directly from Chern-Simons gravity with mixed boundary conditions, linking boundary deformations to bulk gravity.

Findings

Derived $Tar{T}$-deformed Alekseev-Shatashvili action from gravity.

Constructed $Jar T$-deformed WZW model from gravity with a $U(1)$ gauge field.

Confirmed the correspondence between boundary deformations and bulk gravity modifications.

Abstract

In this work we consider AdS$_3$ gravitational theory with certain mixed boundary conditions at spatial infinity. Using the Chern-Simons formalism of AdS$_3$ gravity, we find that these boundary conditions lead to non-trivial boundary terms, which, in turn, produce exactly the spectrum of the $T\bar{T}/J\bar{T}$-deformed CFTs. We then follow the procedure for constructing asymptotic boundary dynamics of AdS$_3$ to derive the constrained $T\bar{T}$-deformed WZW model from Chern-Simons gravity. The resulting theory turns out to be the $T\bar{T}$-deformed Alekseev-Shatashvili action after disentangling the constraints. Furthermore, by adding a $U(1)$ gauge field associated to the current $J$, we obtain one type of the $J\bar T$-deformed WZW model, and show that its action can be constructed from the gravity side. These results provide a check on the correspondence between the $T\bar{T}/J\bar{T}$-deformed CFTs and the deformations of boundary conditions of AdS$_3$, the latter of which may be regarded as coordinate transformations.