Asymptotic symmetries in de Sitter and inflationary spacetimes

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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. While the effect remains unobservable within the domain of a single observer where the symmetry is unbroken, this change is physical when comparing different asymptotic observers, or between a transformed and un-transformed initial state, consistent with the scale-dependent statistical anisotropies previously derived using semiclassical relations. We then compute the overlap, (0| 0′), between the unperturbed de Sitter vacuum |0), and the state

Article number033
JournalJournal of Cosmology and Astroparticle Physics
Issue number4
Number of pages35
Publication statusPublished - 2017

    Research areas

  • gravity, ination, physics of the early universe

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