Bra-Ket Wormholes and the Wigner Distribution

Add to your list(s) Download to your calendar using vCal

• Joshua Kames-King, EPFL
• Thursday 01 May 2025, 13:00-14:00
• Potter Room (B1.19).

If you have a question about this talk, please contact md989.

Based on 2408.08351 and some work in progress. 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.

This talk is part of the Quantum Fields and Strings Seminars series.

This talk is included in these lists:

• All CMS events
• CMS Events
• DAMTP info aggregator
• HEP web page aggregator
• Interested Talks
• Potter Room (B1.19)
• Quantum Fields and Strings Seminars
• bld31
• few29

Note that ex-directory lists are not shown.