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Presented By: Leinweber Center for Theoretical Physics

HET Seminar | On Causality Conditions in de Sitter Spacetime

Rachel Rosen (Carnegie Mellon)

Causality conditions provide powerful constraints on low energy theories. In this talk, I will discuss how standard causality conditions of AdS and flat spacetimes can be extended to de Sitter spacetime. In particular, I will consider the Shapiro time delay experienced by a particle in a black hole or shockwave background and discuss how "fastest null geodesics" can be defined using spatial shifts on the boundary of de Sitter and the relevance of the "stretching" of the de Sitter Penrose diagram. I will discuss a few illustrative examples.

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