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 language | English |
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Article number | 033 |
Journal | Journal of Cosmology and Astroparticle Physics |
Volume | 2017 |
Issue number | 4 |
Number of pages | 35 |
ISSN | 1475-7516 |
DOIs | |
Publication status | Published - 2017 |
Keywords
- gravity
- ination
- physics of the early universe