Two-loop n-point anomalous amplitudes in N=4 supergravity
High Energy Physics - Theory
2020-04-07 v1
Abstract
We compute the anomalous two-loop four-point amplitudes in N=4 pure supergravity, using unitarity and the double-copy construction. We also present all terms determined by four-dimensional cuts in two all-multiplicity two-loop anomalous superamplitudes. This result provides the first two-loop n-point gravity amplitude, up to a class of undetermined rational terms, which are absent at four points. We show that a recently proposed finite counterterm cancels these amplitudes to this order. We argue that the counterterm does not spoil the three-loop finiteness of anomalous amplitudes in the N=4 theory.
Cite
@article{arxiv.1905.05151,
title = {Two-loop n-point anomalous amplitudes in N=4 supergravity},
author = {Zvi Bern and David Kosower and Julio Parra-Martinez},
journal= {arXiv preprint arXiv:1905.05151},
year = {2020}
}
Comments
4 pages + references, 3 figures