Nonrenormalization of next-to-extremal correlators inN=4super Yang-Mills theory and the AdS/CFT correspondence

We show that next-to-extremal correlators of chiral primary operators in $\mathcal{N}=4\mathrm{}$ SYM theory do not receive quantum corrections to first order in perturbation theory. Furthermore, we consider next-to-extremal correlators within AdS supergravity. Here the exchange diagrams contributing to these correlators yield results of the same free-field form as obtained within field theory. This suggests that quantum corrections vanish at strong coupling as well.