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Working in the context of the proposed duality between 3D higher spin gravityand 2D W_N minimal model CFTs, we compute a class of four-point functions inthe bulk and on the boundary, and demonstrate precise agreement between them.This is the first computation of a correlator in 3D higher spin gravity whosefunctional form is not fixed by conformal invariance. In the bulk we make useof elegant methods to solve the scalar field equation using only matrixmanipulations, while on the CFT side we employ the Coulomb gas representation.Comparison is made in the semiclassical limit, in which the central charge istaken to infinity at fixed N. Along the way, we establish the rules forcomputing correlation functions of multi-trace operators in higher spingravity. The method involves solving the scalar master field equation in ageneral representation of the bulk gauge algebra. Although most of our work iscarried out for the bulk theory based on sl(N) x sl(N), we also discuss how ourmethods can be adapted to the hs[\lambda] x hs[\lambda] theory, which isrelevant in the 't Hooft limit.

Matching four-point functions in higher spin AdS_3/CFT_2