English

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 N=8{\cal N}=8 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 42ϵ4-2\epsilon dimensions and for terms of order ϵ2\epsilon^{-2}, ϵ1\epsilon^{-1} and ϵ0\epsilon^{0}.

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

R2 v1 2026-06-22T04:13:44.275Z