May 26 – 31, 2024
Western University
America/Toronto timezone
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(G) Black hole collapse in loop quantum gravity: beyond the marginally trapped case

May 27, 2024, 11:15 AM
15m
SSC Rm 2028 (cap. 135) (Social Science Centre, Western U.)

SSC Rm 2028 (cap. 135)

Social Science Centre, Western U.

Oral not-in-competition (Graduate Student) / Orale non-compétitive (Étudiant(e) du 2e ou 3e cycle) Theoretical Physics / Physique théorique (DTP-DPT) (DTP) M1-2 Quantum Gravity and Cosmology | Gravité quantique et cosmologie (DPT)

Speaker

Francesco Fazzini (University of New Brunswick)

Description

Although black holes have recently been detected through gravitational wave observations and intensively studied through the past decades, we are far away from a complete understanding of their life cycle. In this presentation I'll show a loop quantum gravity-based model of star collapse in which the classical central singularity is replaced by a quantum bounce happening when the star energy density becomes planckian. Immediately after the bounce a shockwave of matter arises carrying all the initial star mass, that then slowly moves outward. The shockwave requires a time proportional to the square of the original star mass to reach the black hole horizon and when this happens, the horizon disappears. This signals the end of the black hole, while the outgoing shockwave becomes visible to external observers. This picture is robust as it holds for a wide range of initial data, in particular including non-marginally trapped configurations.

Keyword-1 shockwaves from black holes
Keyword-2 Loop Quantum Gravity
Keyword-3 star collapse

Author

Francesco Fazzini (University of New Brunswick)

Co-authors

Mr Edward Wilson-Ewing (University of New Brunswick) Mr Lorenzo Cipriani (Università degli studi dell'Aquila)

Presentation materials