I will begin with a review of de Sitter spacetimes and their asymptotics, stressing the physical relevance of such solutions and thus the importance of developing a framework to describe radiating solutions in the regime of full nonlinear general relativity. In order to attempt to describe such gravitational waves, I will use the tools of the covariant phase space formalism (together with suitable analytic continuation of results in anti-de Sitter spacetime due to Papadimitriou & Skenderis) to derive expressions for conserved quantities. I will illuminate these technical steps via the example of a perturbation to the inflationary patch of dS_4, before ending with some discussion regarding future directions for this programme of work. This talk is based on ongoing work in collaboration with Kostas Skenderis and Marika Taylor.
Tuesday, January 19, 2021 - 12:00
Online (Microsoft Teams)
Charges in asymptotically locally de Sitter spacetime