Superstrings near the conformal boundary of AdS₃

We study worldsheet sphere amplitudes, in the RNS formalism, in superstring theory on AdS₃× X with pure NS-NS flux using the near-boundary approximation. By computing a number of amplitudes at low-lying spectral flow, we deduce a candidate for a dual CFT for generic X. Specialising to X= S³× T⁴ and with minimal NS-NS flux, i.e., to the tensionless limit, we explore the effect of the interaction term which we ignore in the near-boundary consideration. We show that amplitudes in the tensionless superstring theory on AdS₃× S³⁴ do not receive perturbative contributions from such an interaction term.