$ \mathcal{N} \geqslant {4} $ supergravity amplitudes from gauge theory at two loops
$ \mathcal{N} \geqslant {4} $ supergravity amplitudes from gauge theory at two loops
We present the full two-loop four-graviton amplitudes in N=4,5,6 supergravity. These results were obtained using the double-copy structure of gravity, which follows from the recently conjectured color-kinematics duality in gauge theory. The two-loop four-gluon scattering amplitudes in N=0,1,2 supersymmetric gauge theory are a second essential ingredient. The gravity amplitudes have …