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2019

The two-loop five-particle amplitude in $\mathcal{N}=8$ supergravity

Chicherin, D., Gehrmann, T., Henn, J. M. et al.

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We compute for the first time the two-loop five-particle amplitude in $\mathcal{N}=8$ supergravity.

Starting from the known integrand, we perform an integration-by-parts reduction and express the answer in terms of uniform weight master integrals.
The latter are known to evaluate to non-planar pentagon functions, described by a 31-letter symbol alphabet.
We express the final result for the amplitude in terms of uniform weight four symbols, multiplied by a small set of rational factors.

The two-loop five-particle amplitude in $\mathcal{N}=8$ supergravity · Around

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