Abstract
The four-point correlation function of two 1/2 BPS primaries of conformal weight Δ = 2 and two 1/2-BPS primaries of conformal weight Δ = n is calculated in the large λ, large N limit. These operators are dual to Kaluza-Klein supergravity fields sk with masses m2 = −4 and m2 = n(n−4). Given that the existing formalism for evaluating sums of products of SO(6) tensors that determine the effective couplings is only suitable for primaries with small conformal dimensions, we make us of an alternative formalism based on harmonic polynomials introduced by Dolan and Osborn. We then show that the supergravity lagrangian relevant to the computation is of σ-model type (i.e., the four-derivative couplings vanish) and that the final result for the connected amplitude splits into a free and an interacting part, as expected on general grounds.
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