$T\bar{T}$ deformations and the pp wave correspondence

Abstract

In this paper we consider $T\bar{T}$ deformations in the context of pp waves obtained from gravity duals. We propose a deformation of $Ad{S}_5\times S^5$ similar to the deformation of the single trace $T\bar{T}$ deformation of $Ad{S}_3\times S^3\times T^4$ with NS-NS flux, and study it through the Penrose limit, concluding that it must correspond to some dipole theory, probably noncommutative. We $T\bar{T}$ deform the worldsheet string for the $Ad{S}_5\times S^5$ pp wave, and find a corresponding spin chain Hamiltonian. Finally, directly $T\bar{T}$ deforming the spin chain Hamiltonian obtained from the pp wave, we find that it corresponds to an equivalent BMN sector of the $\mathcal{N}=4$ SYM.

35 pages, no figures; references and explanations on their relation to our work added; signs changed: sections 3 and 4.3 redone in Euclidean signature for consistency; a few clarifications added

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