Publication : t08/018

Explicit Cancellation of Triangles in One-loop Gravity Amplitudes

Bjerrum-Bohr N.E.J. (Institute for Advanced Study (IAS), Einstein Drive, Princeton, New Jersey 08540, USA)
Vanhove P. (CEA, IPhT (Institut de Physique Théorique), F-91191 Gif-sur-Yvette, France)
We analyse one-loop graviton amplitudes in the field theory limit of a genus-one string theory computation. The considered amplitudes can be dimensionally reduced to lower dimensions preserving maximal supersymmetry. The particular case of the one-loop five-graviton amplitude is worked out in detail and explicitly features no triangle contributions. Based on a recursive form of the one-loop amplitude we investigate the contributions that will occur at n-point order in relation to the ``no-triangle'' hypothesis of N=8 supergravity. We argue that the origin of unexpected cancellations observed in gravity scattering amplitudes is linked to general coordinate invariance of the gravitational action and the summation over all orderings of external legs. Such cancellations are instrumental in the extraordinary good ultra-violet behaviour of N=8 supergravity amplitudes and will play a central role in improving the high-energy behaviour of gravity amplitudes at more than one loop.
Année de publication : 2008
Revue : JHEP 0804 065 (2008)
DOI : 10.1088/1126-6708/2008/04/065
Preprint : arXiv:0802.0868
Langue : Anglais

Fichier(s) à télécharger :
  • 1126-6708_2008_04_065.pdf
  • publi.pdf


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