Scattering amplitudes: the most perfect microscopic structures in the universe

TL;DR

This review summarizes recent advances in understanding the structure of relativistic scattering amplitudes across gauge theories and gravity, highlighting new tools and insights into their color and kinematic properties.

Contribution

It provides a comprehensive overview and pedagogical introduction to recent developments and tools in the study of scattering amplitudes in gauge theories and gravity.

Findings

New organizational tools for color and kinematic structures

Insights into the universality of scattering amplitudes

Connections between gauge theories and gravity

Abstract

This article gives an overview of many of the recent developments in understanding the structure of relativistic scattering amplitudes in gauge theories ranging from QCD to N=4 super-Yang-Mills theory, as well as (super)gravity. I also provide a pedagogical introduction to some of the basic tools used to organize and illuminate the color and kinematic structure of amplitudes. This article is an invited review introducing a special issue of Journal of Physics A devoted to "Scattering Amplitudes in Gauge Theories".