Asymptotic symmetries in de Sitter and inflationary spacetimes

Ricardo J. Z. Ferreira, McCullen Sandora, Martin S. Sloth

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    Abstract

    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

    Original languageEnglish
    Article number033
    JournalJournal of Cosmology and Astroparticle Physics
    Volume2017
    Issue number4
    Number of pages35
    ISSN1475-7516
    DOIs
    Publication statusPublished - 2017

    Keywords

    • gravity
    • ination
    • physics of the early universe

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