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Abstract: Two new formulas which express n-graviton MHV tree amplitudes in terms ofsums of squares of n-gluon amplitudes are discussed. The first formula isderived from recursion relations. The second formula, simpler because itinvolves fewer permutations, is obtained from the variant of the Berends,Giele, Kuijf formula given in Arxiv:0707.1035.



Autor: Henriette Elvang, Daniel Z. Freedman

Fuente: https://arxiv.org/







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