Cosmological correlators in gravitationally-constrained de Sitter states | ICTS

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Seminar
Speaker
Suvrat Raju (ICTS-TIFR, Bengaluru)
Date & Time
Wed, 23 April 2025, 15:30 to 17:30
Venue
Emmy Noether Seminar Room
Resources
Abstract

We study perturbative cosmological correlators in wavefunctionals which solve the Wheeler-DeWitt equation in asymptotically de Sitter spacetimesand were constructed in arxiv:2303.16315. Even in the G_N \rightarrow 0 limit, it is necessary to impose the gravitational Gauss law, which forces states to be de Sitter invariant. We set up Feynman rules for computing cosmological correlators in such states. We enumerate some necessary (but not sufficient) conditions that must be imposed on states and observables to avoid group-volume divergences. We provide sample computations to show that such cosmological correlators can be nontrivial even when the Hartle-Hawking wavefunction is Gaussian. We show that, in the presence of a heavy background state, it is possible to construct a class of state-dependent relational observables that approximate correlators in the Hartle-Hawking state.

Zoom link: https://icts-res-in.zoom.us/j/88092766911?pwd=R3ZrVk9yeW96ZmQ4ZG9KRzVhenRKZz09
Meeting ID: 880 9276 6911
Passcode: 232322