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One-loop four-graviton amplitudes in N=4 supergravity models

Abstract : We evaluate with great details one-loop four-graviton field theory amplitudes in pure N=4 D=4 supergravity. The expressions are obtained by taking the field theory limit of (4,0) and (2,2) string theory models. For each model we extract the contributions of the spin 1 and spin 2 N=4 supermultiplets running in the loop. We show that all the string based constructions with (4,0) symmetry lead to the same answer as the one derived by unitarity and double-copy method in field theory. But the limit of the string theory (2,2) models leads to a different answer, that we attribute to the different nature of the vector multiplet couplings.
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Preprints, Working Papers, ...
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https://hal.archives-ouvertes.fr/hal-00723205
Contributor : Vanhove Pierre Connect in order to contact the contributor
Submitted on : Wednesday, August 8, 2012 - 10:47:57 AM
Last modification on : Monday, December 13, 2021 - 9:16:02 AM

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  • HAL Id : hal-00723205, version 1
  • ARXIV : 1208.1255

Citation

Piotr Tourkine, P. Vanhove. One-loop four-graviton amplitudes in N=4 supergravity models. 2012. ⟨hal-00723205⟩

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