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Multi-Leg One-Loop Gravity Amplitudes from Gauge Theory

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arxiv hep-th/9811140 v2 pith:H4VSON6O submitted 1998-11-15 hep-th gr-qchep-ph

Z. Bern , L. Dixon , M. Perelstein , J.S. Rozowsky This is my paper
classification hep-thgr-qchep-ph
keywords amplitudesgravitytheoryall-plusgaugerelationscutsdetermine
verification ladder T0 review T1 audit T2 compute T3 formal
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By exploiting relations between gravity and gauge theories, we present two infinite sequences of one-loop n-graviton scattering amplitudes: the `maximally helicity-violating' amplitudes in N=8 supergravity, and the `all-plus' helicity amplitudes in gravity with any minimally coupled massless matter content. The all-plus amplitudes correspond to self-dual field configurations and vanish in supersymmetric theories. We make use of the tree-level Kawai-Lewellen-Tye (KLT) relations between open and closed string theory amplitudes, which in the low-energy limit imply relations between gravity and gauge theory tree amplitudes. For n < 7, we determine the all-plus amplitudes explicitly from their unitarity cuts. The KLT relations, applied to the cuts, allow us to extend to gravity a previously found `dimension-shifting' relation between (the cuts of) the all-plus amplitudes in gauge theory and the maximally helicity-violating amplitudes in N=4 super-Yang-Mills theory. The gravitational version of the relation lets us determine the n < 7 N=8 supergravity amplitudes from the all-plus gravity amplitudes. We infer the two series of amplitudes for all n from their soft and collinear properties, which can also be derived from gauge theory using the KLT relations.

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