Singularity structure of maximally supersymmetric scattering amplitudes

Phys Rev Lett. 2014 Dec 31;113(26):261603. doi: 10.1103/PhysRevLett.113.261603. Epub 2014 Dec 29.

Abstract

We present evidence that loop amplitudes in maximally supersymmetric (N=4) Yang-Mills theory (SYM) beyond the planar limit share some of the remarkable structures of the planar theory. In particular, we show that through two loops, the four-particle amplitude in full N=4 SYM has only logarithmic singularities and is free of any poles at infinity--properties closely related to uniform transcendentality and the UV finiteness of the theory. We also briefly comment on implications for maximal (N=8) supergravity theory (SUGRA).