Abstract: Causal Dynamical Triangulations (CDT) is a nonperturbative approach to quantum gravity. The triangulation in the name refers to Regge’s method to discuss gravity, and Feynman’s path integral method allows one to study the quantum behavior of this model. With the help of numerical simulations, we create Universes, where the dynamics are governed by the discretized Einstein-Hilbert action, and each different triangulation counts as a different path in the path integral. Even though nothing is placed in by hand, the model has a very rich phase diagram, where each phase represents a significantly different structure of spacetime. One of these phases is the so-called deSItter phase, where the (EMERGENT) Universe has semiclassical properties and the effective action agrees with the Hartle-Hawking minisupersapce model. In the past years, the properties of the empty CDT universes were thoroughly analyzed, and recently we managed to add classical and quantum scalar fields to the model. In my presentation, I will introduce the audience to the field of CDT and talk about the state of the art.
Abstract e slide disponibili su: https://agenda.infn.it/event/29840/
Il seminario si terrà in presenza nella Sala Galilei (stanza 131) e via Zoom al seguente indirizzo:
https://infn-it.zoom.us/j/84261721878?pwd=MDZNaGdBUlcvUUJXa2phSHZVZk5sdz09
ID riunione: 842 6172 1878
Passcode: 611379