Amplitudes and Ultraviolet Behavior of N=8 Supergravity
  In this contribution we describe computational tools that permit the evaluation of multi-loop scattering amplitudes in N=8 supergravity, in terms of amplitudes in N=4 super-Yang-Mills theory. We also discuss the remarkable ultraviolet behavior of N=8 supergravity, which follows from these amplitudes, and is as good as that of N=4 super-Yang-Mills theory through at least four loops. 
Zvi Bern, John Joseph Carrasco, Lance Dixon, Henrik Johansson, Radu   Roiban
hep-th