A bstract We study the first curvature correction to the string amplitude of four Kaluza-Klein (KK) modes on AdS 3 × S 3 × M 4, with M 4 = K 3 or T 4, in type IIB string theory, which is holographically dual to the four-point correlator O₁O₂O₃O₄ O p 1 O p 2 O p 3 O p 4 of certain half-BPS operators in the boundary D1–D5 CFT. The result takes the form of an integral over the Riemann sphere, analogous to the flat-space Virasoro-Shapiro amplitude, but with insertions of single-valued multiple polylogarithms of weight three. Our results are obtained in two steps. First, we derive the AdS 3 × S 3 Virasoro-Shapiro amplitude in the special case OₚOₚO₁O₁ O p O p O 1 O 1, by matching the CFT block expansion with an ansatz based on single-valued multiple polylogarithms. We then employ the AdS × S Mellin formalism to generalize the result to the general case of four arbitrary KK modes O₁O₂O₃O₄ O p 1 O p 2 O p 3 O p 4. Our analysis yields an infinite set of results for operator anomalous dimensions and OPE data in D1–D5 CFT at strong coupling. In particular, the resulting scaling dimensions of certain operators are shown to be consistent with classical string theory computations.
Jiang et al. (Thu,) studied this question.