Jose Senovilla: Characterizing the existence of gravitational radiation at null infinity in asymptotically de Sitter (and flat) spacetimes

Time: Tue 2019-10-15 10.00 - 11.00

Lecturer: Jose Senovilla, University of the Basque Country

Location: Seminar Hall Kuskvillan, Institut Mittag-Leffler

Abstract

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).

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Last changed: Oct 10, 2019