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 …

We show that a 3D sourced conformal Carrollian field theory has the right kinematic
properties to holographically describe gravity in 4D asymptotically flat spacetime. The …

By virtue of the Noether theorems, the vast gauge redundancy of general relativity provides
us with a rich algebra of boundary charges that generate physical symmetries. These …

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

A bstract We propose an extension of the BMS group, which we refer to as Weyl BMS or
BMSW for short, that includes super-translations, local Weyl rescalings and arbitrary …

A bstract We develop the covariant phase space formalism allowing for non-vanishing flux,
anomalies, and field dependence in the vector field generators. We construct a charge …

Asymptotically flat spacetimes have been studied in five separate regions: future/past
timelike infinity $ i^\pm $, future/past null infinity $\mathcal {I}^\pm $, and spatial infinity i 0 …

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 …

A bstract We demonstrate that the one-loop exact subleading soft graviton theorem
automatically follows from conservation of the BMS charges, provided that the hard and soft …

A bstract We provide a unified treatment of conformally soft Goldstone modes which arise
when spin-one or spin-two conformal primary wavefunctions become pure gauge for certain …