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  • Ultraviolet behavior of N =...
    Bern, Z; Carrasco, J J M; Dixon, L J; Johansson, H; Roiban, R

    Physical review letters, 08/2009, Letnik: 103, Številka: 8
    Journal Article

    We describe the construction of the complete four-loop four-particle amplitude of N=8 supergravity. The amplitude is ultraviolet finite, not only in four dimensions, but in five dimensions as well. The observed extra cancellations provide additional nontrivial evidence that N=8 supergravity in four dimensions may be ultraviolet finite to all orders of perturbation theory.