Abstract
General Relativity has been one of the most successful theories in the whole of physics, but it predicts its own demise at spacetime singularities. The regular black hole program provides potential escape routes from the classical singularity theorems, requiring the removal of all curvature singularities, but this comes at the price of problematic non-trivial causal structures. My research aims at evading all these issues by rethinking the meaning of quantum black hole. Inspired by some simple arguments from quantum mechanics, the coherent state approach to quantum gravity provides a natural regularisation for black hole interiors. Quantum-corrected geometries within this approach have the classical singularity replaced by an integrable singularity, at which all physical observables remain finite. The result is a black hole geometry with a macroscopic quantum core. Notably, the size of the core, acting as regulator of quantum gravity effects, turns out to be the parameter controlling the deviations (quantum hair) of the geometry from General Relativity affecting the regions outside the event horizon. Due to the macroscopic nature of the core, these deviations can in principle be tested by means of near-horizon astronomical observations. I will generalise this simple idea to the case of rotating black holes, investigate their geometry and thermodynamic properties, and shed some light on the physical nature and features of these emerging quantum cores. Then, having built the entire theoretical framework, I will test this idea against astronomical observations such as: S-star orbits near our galaxy center; quasi-normal modes emissions; black hole shadows. My key objectives are: (i) To develop the full theoretical framework for the coherent state formulation of (quantum) black holes. (ii) To extract testable predictions from the proposed models of quantum black holes.
Dettagli del progetto
Responsabile scientifico: Andrea Giusti
Strutture Unibo coinvolte:
Dipartimento di Fisica e Astronomia "Augusto Righi"
Coordinatore:
ALMA MATER STUDIORUM - Università di Bologna(Italy)
Costo totale di progetto: Euro (EUR) 289.950,00
Contributo totale di progetto: Euro (EUR) 289.950,00
Costo totale Unibo: Euro (EUR) 289.950,00
Contributo totale Unibo: Euro (EUR) 289.950,00
Durata del progetto in mesi: 36
Data di inizio
21/05/2025
Data di fine:
20/05/2028
