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research article

De Sitter Bra-Ket wormholes

Fumagalli, Alessandro  
•
Gorbenko, Victor  
•
Kames-King, Joshua
May 8, 2025
Journal of High Energy Physics

We study a model for the initial state of the universe based on a gravitational path integral that includes connected geometries which simultaneously produce bra and ket of the wave function. We argue that a natural object to describe this state is the Wigner distribution, which is a function on a classical phase space obtained by a certain integral transform of the density matrix. We work with Lorentzian de Sitter Jackiw-Teitelboim gravity in which we find semiclassical saddle-points for pure gravity, as well as when we include matter components such as a CFT and a classical inflaton field. We also discuss different choices of fixing time reparametrizations. In the regime of large universes our connected geometry dominates over the Hartle-Hawking saddle and gives a distribution that has a meaningful probabilistic interpretation for local observables. It does not, however, give a normalizable probability measure on the entire phase space of the theory.

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10.1007_jhep05(2025)074.pdf

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Published version

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openaccess

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CC BY

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a972657bb00c9273cfd7a7a696d849ae

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