Jose Senovilla: Characterizing the existence of gravitational radiation at null infinity in asymptotically de Sitter (and flat) spacetimes
Tid: Ti 2019-10-15 kl 10.00 - 11.00
Föreläsare: Jose Senovilla, University of the Basque Country
Plats: Seminar Hall Kuskvillan, Institut Mittag-Leffler
I will present ongoing work that permits to determine the existence of gravitational radiation at null infinity (scri) in asymptotically de Sitter spacetimes. To that aim, I will first present a novel characterization of the existence of radiation at scri in asymptotically flat spacetimes whose main virtue is that it can perform equally well in the presence of a positive cosmological constant. Then, I will show the subtleties arising in the presence of a positive Lambda and how to deal with them. The existence of “News” tensors in this case will also be discussed. (In collaboration with F. Fernández-Álvarez).