On one loop corrections in higher spin gravity

A bstract We propose an approach to compute one-loop corrections to the four-point amplitude in the higher spin gravities that are holographically dual to free O ( N ), U( N ) and USp( N ) vector models. We compute the double-particle cut of one-loop diagrams by expressing them in terms of tree level four-point amplitudes. We then discuss how the remaining contributions to the complete one-loop diagram can be computed. With certain assumptions we find nontrivial evidence for the shift in the identification of the bulk coupling constant and 1/ N in accordance with the previously established result for the vacuum energy.