New insights into soft gluons and gravitons

TL;DR

This paper reviews recent advances in understanding soft gluon and graviton emissions in QCD and gravity, highlighting new mathematical structures and techniques that improve the comprehension of infrared singularities and all-order properties.

Contribution

It introduces novel insights into the relationship between soft gluons in QCD and gravitons in gravity, emphasizing recent mathematical developments.

Findings

Enhanced understanding of infrared singularities

New techniques for summing large logarithms

Deeper connection between QCD and gravity

Abstract

The study of gluon radiation in QCD, in the limit of small ("soft") momentum, remains an active research area, with a variety of phenomenological and theoretical applications. Soft gluon emission leads to large logarithms in perturbation theory which have to be summed up to all orders in the coupling, and also governs the structure of infrared singularities. Recently, new techniques and mathematical structures have been discovered, which enhance our understanding of these all-order properties. This contribution will review a number of key topics, including the relationship between QCD and gravity.