Speaker
Maël Chantreau
(Institut Denis Poisson)
Description
In this poster, we will provide a definition for a notion of extended boundary at time-like infinity which, following Figueroa-O'Farril--Have--Prohazka--Salzer, we refer to as Ti. This definition applies to asymptotically flat spacetime in the sense of Ashtekar--Romano and is constructed solely from the asymptotic data of the metric. The group of automorphisms of this extended boundary is the SPI group, which can be restricted under some conditions to the more commonly studied BMS group. Furthermore, scattering data for massive fields are realised as functions on Ti, where they form a representation of the BMS group. One can in turn reconstruct the massive field in the bulk through an analogue of the Kirschoff-d'Adhémar formula.
Primary authors
Jack Borthwick
(LMBA)
Maël Chantreau
(Institut Denis Poisson)
Yannick Herfray
(Institut Denis Poisson (Université de Tours))
