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We extend the argument presented by Benincasa, Boucher-Veronneau, and Cachazo to show that graviton tree amplitudes are well behaved under large complex deformations of the momenta of a pair of like-helicity gravitons.
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N. E. J. Bjerrum-Bohr, D. C. Dunbar and H. Ita, “Six-point one-loop N = 8 supergravity NMHV amplitudes and their IR behaviour,” Phys. Lett. B 621
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P. Benincasa, C. Boucher-Veronneau and F. Cachazo, “Taming tree amplitudes in general relativity,” arXiv:hep-th/0702032
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