AVVISO DI SEMINARIO
Lunedì 8 Aprile 2019 - ore 15:00
Dipartimento di Fisica - Largo B.Pontecorvo, 3
Aula 131 - piano terra - Ed. C
(Radboud University, Nijmegen)
Terrà un seminario dal titolo:
“Quantum Gravity from Causal Dynamical Triangulations”
Abstract: Causal Dynamical Triangulations (CDT) is a candidate theory for quantum gravity, formulated nonperturbatively as the scaling limit of a lattice theory in terms of triangulated spacetimes. An important feature of this approach is its elegant resolution of the problem of diffeomorphism symmetry in the full, background-free quantum theory. This has enabled the concrete computation of geometric observables in a highly nonperturbative, Planckian regime, an important step in putting quantum gravity on a quantitative footing. — I will briefly describe the set-up of CDT quantum gravity and some of its unique results, including the presence of second-order phase transitions, the dynamical emergence of semi-classical de Sitter behaviour, and the implementation of renormalization group methods in absence of a fixed background. The theoretical challenge is to enlarge the arsenal of suitable observables, both to characterize "quantum geometry" and to extrapolate to the semi-classical and cosmological regimes. I explain where we are in this search, highlighting the recently introduced notion of quantum Ricci curvature.