Speaker
Emil Have
(Niels Bohr Institute)
Description
I will discuss the construction of boundary energy-momentum tensors for asymptotically flat spacetimes, which relies on considering the most general allowed conformal Carrollian geometry on future null infinity. I will describe holographic renormalisation of Einstein gravity in such spacetimes, and demonstrate how the variation of the on-shell renormalised Einstein-Hilbert action gives rise to an energy-momentum-news complex in four bulk spacetime dimensions. This complex satisfies a number of Ward identities: the diffeomorphism Ward identity gives rise to covariant Bondi loss equations, while Carroll boosts are anomalous.
