Are Soft Theorems Renormalized?
High Energy Physics - Theory
2014-07-02 v2
Abstract
We show that the distributional nature of soft theorems requires the soft limit expansion to take priority over the regulator expansion of Feynman loop integrals. We start the study of soft graviton theorems at loop level from this perspective by considering a five-particle one-loop amplitude in supergravity. Surprisingly, we find that a soft theorem recently introduced by one of the authors and Strominger is not renormalized in this case. Computations are done in dimensions and for terms of order , and .
Keywords
Cite
@article{arxiv.1405.3413,
title = {Are Soft Theorems Renormalized?},
author = {Freddy Cachazo and Ellis Ye Yuan},
journal= {arXiv preprint arXiv:1405.3413},
year = {2014}
}
Comments
New section on soft theorems vs soft expansions included, citations added and typos fixed in v2