The soft limits of scattering amplitudes have been extensively studied due to their essential
role in the computation of physical observables in collider physics. The universal …

Celestial holography proposes a duality between the gravitational $\mathcal {S} $-matrix
and correlators in a conformal field theory living on the celestial sphere. In this white paper …

We study exponentiated soft exchange in (d+ 2)-dimensional gauge and gravitational
theories using the celestial conformal field theory formalism. These models exhibit …

These notes are a transcript of lectures given by the author in the XVIII Modave summer
school in mathematical physics. The introduction is devoted to a detailed review of the …

We derive the soft effective action in (d+ 2)-dimensional Abelian gauge theories from the on-
shell action obeying Neumann boundary conditions at timelike and null infinity and Dirichlet …

A bstract We investigate asymptotic symmetries in flat backgrounds of dimension higher than
or equal to four. For spin two we provide the counterpart of the extended BMS …

A bstract We give an explicit realization of the 4d local operator/2d conformal block
correspondence of Costello and Paquette in the case of gauge theories. This is …

In the sigma model, soft insertions of moduli scalars enact parallel transport of S-matrix
elements about the finite-dimensional moduli space of vacua, and the antisymmetric double …

A bstract In this paper, we provide a self-contained investigation of the Weyl double copy in
the Newman-Penrose formalism. We examine the Weyl double copy constraints for the …

A bstract We perform a careful study of the infrared sector of massless non-abelian gauge
theories in four-dimensional Minkowski spacetime using the covariant phase space …