This review describes the duality between color and kinematics and its applications, with the
aim of gaining a deeper understanding of the perturbative structure of gauge and gravity …

Advances in scattering amplitudes have exposed previously-hidden color-kinematics and
double-copy structures in theories ranging from gauge and gravity theories to effective field …

The double copy is, in essence, a map between scattering amplitudes in a broad variety of
familiar field and string theories. In addition to the mathematically rich intrinsic structure, it …

The duality between color and kinematics was originally observed for purely adjoint
massless gauge theories, and later found to hold even after introducing massive fermionic …

We study the double-copy relation between classical solutions in gauge theory and gravity,
focusing on four-dimensional vacuum metrics of algebraic type D, a class that includes …

A bstract In the standard derivation of the Kerr-Schild double copy, the geodicity of the Kerr-
Schild vector and the stationarity of the spacetime are presented as assumptions that are …

Celestial amplitudes which use conformal primary wave functions rather than plane waves
as external states offer a novel opportunity to study properties of amplitudes with manifest …

A bstract The classical double copy relates solutions to the equations of motion in gauge
theory and in gravity. In this paper, we present two double-copy formalisms for relating the …

Given a solution to 4D Einstein gravity with an isometry direction, it is known that the
equations of motion are identical to those of a 3D σ model with target space geometry SU (1 …

A bstract Recent work has shown how on-shell three-point amplitudes in gauge theory and
gravity, representing the coupling to massive particles, correspond in the classical limit to the …