It has been realized that nonlocality might be a key ingredient for the formulation of a quantum renormalizable theory of gravitation. In facts, nonlocal gravitational models are earning growing interest in the scientific community, since they are super-renormalizable or even finite at quantum level. In this seminar I will introduce nonlocal field theories and discuss their general features....
Gravitational-wave astronomy can give us access to structure of black holes, potentially probing microscopic corrections at the horizon scale. Some quantum-gravity models of exotic compact objects replace the event horizon by a reflective surface. Spinning horizonless compact objects with these properties may be unstable against an ergoregion instability.
In this talk we investigate a model...
Effective field theory methods suggest that some rather-general extensions of General Relativity include higher-order curvature corrections, with small coupling constants. In this talk, we discuss black hole solutions in such a framework. First, we construct spherically symmetric black hole solutions and study gravitational perturbation around them. Despite the higher-order operators of the...
Corpuscular gravity has originated from the observation that a black hole can be viewed as a Bose-Einstein condensate at the critical point, with a large occupation number of (soft off-shell) gravitons and no central singularity. This innovative approach moves away from the semi-classical picture of quantum field theory on curved backgrounds and considers self-gravitating systems as truly...
Despite the good agreement between theoretical predictions and observational results, the cosmological constant is not a satisfactory explanation for the accelerated expansion of the universe. Hence an intense theoretical effort has been devoted to the study of models beyond General Relativity plus a cosmological constant.
In this talk, I will present ongoing work on the study of the...
