Théorie

Euclidean Wormholes and Holography

Wormholes are exotic solutions of General Relativity that still challenge our physical intuition. In this talk I will first review and distinguish various types of wormholes along with their expected physical properties. I will then focus on asymptotically AdS wormhole solutions in the context of holography. I will explain how to compute correlation functions of local operators as well as non local observables such as correlation functions of Wilson loops on the distinct boundaries and discuss their behavior.

Stochastic formalism of cosmic inflation, with applications to the physics of primordial black holes. La soutenance HDR Vincent Vennin

Dear friends and colleagues,

It is my pleasure to invite you to my habilitation defense, which will take place on the 30th of June at 3pm. 

I will present my work on the stochastic formalism of cosmic inflation, with applications to the physics of primordial black holes (a short description follows below).

Due to the current covid-19 restrictions, unfortunately, only members of the jury will be allowed to be physically present. The defense will however be broadcasted online, via the BlackBoard Collaborate platform:

Vainshtein screening for slowly rotating stars 

We study the Vainshtein mechanism in the context of slowly rotating stars in scalar-tensor theories.
While the Vainshtein screening is well established for spherically symmetric spacetimes, we introduce a slow rotation of the source and examine its validity in the axi-symmetric case.
We solve for the frame-dragging function accounting for the slow rotation and show that the deviations from the general relativity (GR) solution are screened in the weak-field approximation, meaning the solution for the frame-dragging function is the same as GR to leading order.

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