[astroseminar at Sapienza] Amaldi Research Center seminar - Prof. Michela Mapelli, thursday 20/05/2021 at 16:00

[raffaella.schneider at roma1.infn.it]

Dear Colleagues,

I am pleased to announce the following seminar of the Amaldi Research Center.

Best regards,

Raffaella Schneider

Prof. Raffaella Schneider
Dipartimento di Fisica "G. Marconi”
Senior Fellow, Scuola Superiore di Studi Avanzati Sapienza
Sapienza, Università di Roma
P.le A. Moro 2, 00185 Roma, Italy
raffaella.schneider at uniroma1.it

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Amaldi Research Center seminar

Thursday May 20 2021, 4 pm

Prof. Michela Mapelli (Università di Padova)

Title: "Binary black holes and intermediate-mass black holes across cosmic time”

Abstract:

The latest results from the LIGO-Virgo-KAGRA collaboration draw a spectacular fresco of binary black hole mergers, ranging from a few to more than hundred solar masses. In this talk, I will discuss the main astrophysical formation channels of binary black holes, highlighting the open questions. On the one hand, models of stellar evolution and pair instability suggest the existence of a gap in the mass spectrum of black holes between ~60 and ~120 solar masses. The boundaries of this gap drastically depend on stellar rotation and on the efficiency of envelope removal. On the other hand, extreme dynamical processes in dense star clusters can fill the mass gap, via multiple stellar collisions, dynamical exchanges and hierarchical mergers. These processes might build up intermediate-mass black holes with mass up to several thousand solar masses, especially in the most metal-poor and massive clusters. The evolution of such dynamical mergers across cosmic time will be one of the most exciting targets of next-generation ground-based detectors.
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