High Energy Physics Seminar next Thursday - Alessandro Fumagalli

[HECAP - Margherita Di Giovannantonio]

*_HIGH ENERGY PHYSICS SEMINARS_**__*

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*Thursday, 19 March *2026, at *16:00* - _*L. Stasi Seminar 
Room*_**-*https://indico.ictp.it/event/11287/*


<https://indico.ictp.it/event/11240/>

Alessandro Fumagalli (Amsterdam University)


*“Cosmological Bra-Ket Wormholes"*
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_Abstract_

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. 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. I will discuss a toy two-dimensional 
model (de Sitter JT gravity) where we find semiclassical saddle-points 
of this type, where the connected geometry dominates over the 
Hartle-Hawking saddle and gives a distribution that has a meaningful 
probabilistic interpretation for local observables. Moreover, I will 
report some preliminary results on these type of solutions in four 
space-time dimensions.



To attend via _*Zoom*_, please *_register_* here:
<https://zoom.us/meeting/register/8ICZuERWQWqc-5M-K1fdAQ>https://zoom.us/meeting/register/r8lhQBmsSjeO9xunnvluvw