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 …

A bstract The tree-level S-matrix of Einstein's theory is known to have a representation as an
integral over the moduli space of punctured spheres localized to the solutions of the …

A bstract We study celestial chiral algebras appearing in celestial holography, using the light-
cone gauge formulation of self-dual Yang-Mills theory and self-dual gravity, and explore also …

We explain how twistor theory represents the self-dual sector of four dimensional gravity in
terms of the loop group of Poisson diffeomorphisms of the plane via Penrose's non-linear …

A bstract Recently, a perturbative duality between gauge and gravity theories (the double
copy) has been discovered, that is believed to hold to all loop orders. In this paper, we …

We briefly review the manifold incarnations and facets of the notion that gravity, in certain
regards, can be re-conceived as the product of two gauge theories. We begin with a short …

We review aspects of twistor theory, its aims and achievements spanning the last five
decades. In the twistor approach, space–time is secondary with events being derived …

The classical double copy relates exact solutions of gauge, gravity, and other theories.
Although widely studied, its origins and domain of applicability have remained mysterious. In …

We show that double-copy maps for amplitudes in effective field theory are severely
constrained at four points by self-consistency and locality at six points. The resulting double …

A bstract Carrollian holography aims to express gravity in four-dimensional asymptotically
flat spacetime in terms of a dual three-dimensional Carrollian CFT living at null infinity …