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- W2155609148 abstract "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." @default.
- W2155609148 created "2016-06-24" @default.
- W2155609148 creator A5016161528 @default.
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- W2155609148 date "2008-01-11" @default.
- W2155609148 modified "2023-10-13" @default.
- W2155609148 title "Unexpected cancellations in gravity theories" @default.
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- W2155609148 doi "https://doi.org/10.1103/physrevd.77.025010" @default.