Ultraviolet behavior of N = 8 supergravity at four loops.
Phys Rev Lett
; 103(8): 081301, 2009 Aug 21.
Article
em En
| MEDLINE
| ID: mdl-19792710
ABSTRACT
We describe the construction of the complete four-loop four-particle amplitude of N=8 supergravity. The amplitude is ultraviolet finite, not only in four dimensions, but in five dimensions as well. The observed extra cancellations provide additional nontrivial evidence that N=8 supergravity in four dimensions may be ultraviolet finite to all orders of perturbation theory.
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Ano de publicação:
2009
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Article