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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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Type
research article
DOI
10.1007/jhep05(2025)074
Author(s)
Fumagalli, Alessandro  

École Polytechnique Fédérale de Lausanne

Gorbenko, Victor  

École Polytechnique Fédérale de Lausanne

Kames-King, Joshua

École Polytechnique Fédérale de Lausanne

Date Issued

2025-05-08

Publisher

Springer

Published in
Journal of High Energy Physics
Volume

2025

Issue

5

Article Number

74

Subjects

2D Gravity

•

Cosmological models

•

de Sitter space

•

Models of Quantum Gravity

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LTFP  
Available on Infoscience
May 13, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/250079
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