$T\bar T$ and LST

Understand

It was recently shown that the theory obtained by deforming a general two dimensional conformal theory by the irrelevant operator $T\bar T$ is solvable.

• In the context of holography, a large class of such theories can be obtained by studying string theory on $AdS_3$.
• We show that a certain $T\bar T$ deformation of the boundary $CFT_2$ gives rise in the bulk to string theory in a background that interpolates between $AdS_3$ in the IR and a linear dilaton spacetime in the UV, i.e.
• to a two dimensional vacuum of Little String Theory.