Note on graviton MHV amplitudes

@article{Elvang2007NoteOG,
  title={Note on graviton MHV amplitudes},
  author={Henriette Elvang and Daniel Z. Freedman},
  journal={Journal of High Energy Physics},
  year={2007},
  volume={2008},
  pages={096-096}
}
Two new formulas which express n-graviton MHV tree amplitudes in terms of sums of squares of n-gluon amplitudes are discussed. The first formula is derived from recursion relations. The second formula, simpler because it involves fewer permutations, is obtained from the variant of the Berends, Giele, Kuijf formula given in Arxiv:0707.1035. 
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