Inherited Twistor-Space Structure of Gravity Loop Amplitudes

Details Inherited Twistor-Space Structure of Gravity Loop Amplitudes Inherited Twistor-Space Structure of Gravity Loop Amplitudes

2005-01-18

arxiv.org/abs/hep-th/0501137v2

JHEP 0505 (2005) 056

Physics

High Energy Physics

High Energy Physics - Theory

32 pages, minor typos corrected

Scientific paper

10.1088/1126-6708/2005/05/056

At tree-level, gravity amplitudes are obtainable directly from gauge theory amplitudes via the Kawai, Lewellen and Tye closed-open string relations. We explain how the unitarity method allows us to use these relations to obtain coefficients of box integrals appearing in one-loop N=8 supergravity amplitudes from the recent computation of the coefficients for N=4 super-Yang-Mills non-maximally-helicity-violating amplitudes. We argue from factorisation that these box coefficients determine the one-loop N=8 supergravity amplitudes, although this remains to be proven. We also show that twistor-space properties of the N=8 supergravity amplitudes are inherited from the corresponding properties of N=4 super-Yang-Mills theory. We give a number of examples illustrating these ideas.

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