HET-Discovery seminar by Martin Sloth – University of Copenhagen

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HET-Discovery seminar by Martin Sloth

Title: Asymptotic Symmetries in de Sitter and Inflationary Spacetimes

Soft gravitons produced by the expansion of de Sitter can be viewed as
the Nambu-Goldstone bosons of spontaneously broken asymptotic symmetries of the
de Sitter spacetime. We explicitly construct the associated charges, and show
that acting with the charges on the vacuum creates a new state equivalent to a
change in the local coordinates induced by the soft graviton. We then
discuss how infrared effects in de Sitter and inflationary spacetimes and be
reformulated in terms of this new state. We also make comparisons with a
related discussion of black hole evaporation.