We argue that recent results in string perturbation theory indicate that the four-graviton amplitude of four-dimensional N=8 supergravity might be ultraviolet finite up to eight loops. We similarly argue that the h-loop M-graviton amplitude might be finite for h<7+M/2.
View Article and Find Full Text PDFPhys Rev D Part Fields
May 1994
Phys Rev D Part Fields
May 1993