GW190521 as a merger of Proca stars: a potential new vector boson of $8.7\times 10^{-13}$ eV

Juan Calderón Bustillo, Nicolas Sanchis-Gual, Alejandro Torres-Forné +6

Advanced LIGO-Virgo reported a short gravitational-wave signal (GW190521) interpreted as a quasi-circular merger of black holes, one populating the pair-instability supernova gap,…