Perturbing the symmetric orbifold from the worldsheet

: The symmetric orbifold of T 4 is the analogue of free SYM in four dimensions, and its dual is described by a tensionless string propagating in AdS 3 × S 3 × T 4 . In this paper we study the deformation of this exact AdS/CFT duality away from the free point. On the symmetric orbifold side this amounts to perturbing the theory by the exactly marginal operator from the 2-cycle twisted sector. We identify the corresponding perturbation in the dual worldsheet description, and show that the anomalous conformal dimensions of a number of symmetric orbifold currents are correctly reproduced from this worldsheet perspective.

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