Centre de Physique Théorique


Vendredi 27 octobre 2017

14h00 – 15h00, Amphi 5 du CPT

Finite quantum gravity and spacetime singularities

Leonardo Modesto

I present a class of weakly nonlocal gravitational theories finite and unitarity at quantum level. Moreover, such class of theories is actually a range of anomaly-free conformally invariant quantum theories in the spontaneously broken phase of the Weyl symmetry. At classical level I show how conformal invariance is likely able to tame the spacetime singularities that plague not only Einstein gravity, but also local and weakly non-local higher derivative theories. This latter statement is rigorously proved by a simple singularity theorem that applies to a large class of weakly non-local theories. Following the seminal paper by Narlikar and Kembhavi, I provide examples of exact solutions for singularity-free black holes.