As of today, there exist consistent, gauge-invariant string field theories describing all string
theories: bosonic open and closed strings, open superstrings, heterotic strings, and type II …

Scattering amplitudes have their origin in quantum field theory, but have wide-ranging
applications extending to classical physics. We review a formalism to connect certain …

A bstract We introduce a novel bootstrap method for heavy-mass effective field theory
classical Compton scattering amplitudes involving two massless particles and two arbitrary …

A bstract The Weyl double copy is a procedure for relating exact solutions in biadjoint scalar,
gauge and gravity theories, and relates fields in spacetime directly. Where this procedure …

A bstract Many gauge theories possess a hidden duality between color and kinematics in
their on-shell scattering amplitudes. An open problem is to formulate an off-shell realization …

We analyze theories with color-kinematics duality from an algebraic perspective and find
that any such theory has an underlying BV▪-algebra, extending the ideas of Reiterer [A …

A bstract It was recently proposed that the kinematic algebra featuring in the colour-
kinematics duality for scattering amplitudes in heavy-mass effective field theory (HEFT) and …

We show that the double copy of gauge theory amplitudes to N= 0 supergravity amplitudes
extends from tree level to loop level. We first explain that color-kinematics duality is a …

This essay's title is justified by discussing a class of Yang–Mills-type theories of which
standard Yang–Mills theories are special cases but which is broad enough to include gravity …

A bstract We formulate a new program to generalize the double-copy of tree amplitudes. The
approach exploits the link between the identity element of the “KLT algebra” and the KLT …