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 …

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We propose a consistent set of boundary conditions for gravity in asymptotically flat
spacetime at spacelike infinity, which yields an enhancement of the Bondi-Metzner-Sachs …

A bstract We study the renormalized action and the renormalized presymplectic potential for
Maxwell fields on Anti de Sitter backgrounds of any dimensions. We then use these results …

A bstract In this paper we systematically develop the flat/CFT holographic dictionary,
building on AdS/CFT holography. After analysing the behaviour of scalar field modes on …

A bstract Superrotations are local extensions of the Lorentz group at null infinity that have
been argued to be symmetries of gravitational scattering. In their smooth version, they can …

Asymptotic symmetries are known to constrain the infrared behaviour of scattering
processes in asymptotically flat spacetimes. By the same token, one expects symmetries of …

Charges associated with gauge symmetries are defined on boundaries of spacetimes. But
these constructions typically involve divergent quantities when considering asymptotic …

We study the infrared on-shell action of Einstein gravity in asymptotically flat spacetimes,
obtaining an effective, gauge-invariant boundary action for memory and shockwave …

We consider soft electrons in massless QED at tree level. The emission amplitude at leading
order in the soft electron energy factorizes in a way similar to the soft photon case. We recast …