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 …

This white paper summarizes recent progress in the cosmological bootstrap, an approach to
the study of the statistics of primordial fluctuations from consistency with unitarity, locality and …

A bstract Scattering amplitudes at weak coupling are highly constrained by Lorentz
invariance, locality and unitarity, and depend on model details only through coupling …

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 A key insight of the bootstrap approach to cosmological correlations is the fact that
all correlators of slow-roll inflation can be reduced to a unique building block—the four-point …

We extend the cosmological bootstrap to correlators involving massless particles with spin.
In de Sitter space, these correlators are constrained both by symmetries and by locality. In …

A bstract We propose a Mellin space approach to the evaluation of late-time momentum-
space correlation functions of quantum fields in (d+ 1)-dimensional de Sitter space. The …

A bstract We compute the tree-level late-time graviton four-point correlation function, and the
related quartic wavefunction coefficient, for Einstein gravity in de Sitter spacetime. We derive …

A bstract Speed matters. How the masses and spins of new particles active during inflation
can be read off from the statistical properties of primordial density fluctuations is well …

A bstract The wavefunction in quantum field theory is an invaluable tool for tackling a variety
of problems, including probing the interior of Minkowski spacetime and modelling boundary …