Assembling GW231123 in star clusters through the combination of stellar binary evolution and hierarchical mergers

Lavinia Paiella, Cristiano Ugolini, Mario Spera +2

GW231123 is the most massive binary black hole (BBH) merger detected to date by the LIGO-Virgo-KAGRA collaboration. With at least one black hole (BH) in the upper-mass gap and both…