We review the role that infinite-dimensional symmetries arising at the boundary of
asymptotically flat spacetimes play in the context of the celestial holography program. Once …

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 …

Gravity in 4 d asymptotically flat spacetime constitutes the archetypal example of a
gravitational system with leaky boundary conditions. Pursuing our previous analysis of …

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 …

A bstract Carrollian conformal field theories (carrollian CFTs) are natural field theories on
null infinity of an asymptotically flat spacetime or, more generally, geometries with conformal …

A bstract We explore the celestial holography proposal for non-trivial asymptotically flat
backgrounds including the Coulomb field of a static and spinning point charge, their …

We evaluate the vacuum entanglement entropy across a cut of future null infinity for free
Maxwell theory in four-dimensional Minkowski spacetime. The Weyl invariance of 4D …

A bstract Previous work on black hole partition functions and entanglement entropy suggests
the existence of “edge” degrees of freedom living on the (stretched) horizon. We identify a …

A bstract We present a discrete basis of solutions of the massless Klein-Gordon equation in
3+ 1 Minkowski space which transform as 𝔰𝔩 (2, ℂ) Lorentz/conformal primaries and …

A bstract We identify an eikonal regime in celestial CFT 2 in which massless 2-2 scattering is
dominated by t-channel exchange. We derive a formula for the celestial amplitude that …