Unexpected Cancellations in Gravity Theories

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Recent computations of scattering amplitudes show that N = 8 supergravity is surprisingly well behaved in the ultraviolet and may even be ultraviolet finite in perturbation theory. The novel cancellations necessary for ultraviolet finiteness first appear at one loop in the guise of the ''no-triangle hypothesis''. We study one-loop amplitudes in pure Einstein gravity and point out the existence of cancellations similar to those found previously in N = 8 supergravity. These cancellations go beyond those found in the one-loop effective action. Using unitarity, this suggests that generic theories of quantum gravity based on the Einstein-Hilbert action may be better ... continued below

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40 pages

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Bern, Z.; Carrasco, J.J.; /UCLA; Forde, D.; /SLAC, /UCLA; Ita, H. et al. July 13, 2007.

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Recent computations of scattering amplitudes show that N = 8 supergravity is surprisingly well behaved in the ultraviolet and may even be ultraviolet finite in perturbation theory. The novel cancellations necessary for ultraviolet finiteness first appear at one loop in the guise of the ''no-triangle hypothesis''. We study one-loop amplitudes in pure Einstein gravity and point out the existence of cancellations similar to those found previously in N = 8 supergravity. These cancellations go beyond those found in the one-loop effective action. Using unitarity, this suggests that generic theories of quantum gravity based on the Einstein-Hilbert action may be better behaved in the ultraviolet at higher loops than suggested by naive power counting, though without additional (supersymmetric) cancellations they diverge. We comment on future studies that should be performed to support this proposal.

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40 pages

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  • Journal Name: Phys.Rev.D77:025010,2008; Journal Volume: 77

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  • Report No.: SLAC-PUB-12609
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 922609
  • Archival Resource Key: ark:/67531/metadc893606

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  • July 13, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 2, 2016, 4:44 p.m.

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Bern, Z.; Carrasco, J.J.; /UCLA; Forde, D.; /SLAC, /UCLA; Ita, H. et al. Unexpected Cancellations in Gravity Theories, article, July 13, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc893606/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.