GW190521 as a Merger of Proca Stars: A Potential New Vector Boson of 8.7 ×10$^-13$ eV
Juan Calderón Bustillo, Nicolas Sanchis-Gual, Alejandro Torres-Forné, José A. Font, Avi Vajpeyi, Rory Smith, Carlos Herdeiro, Eugen Radu, Samson H.~W. Leong
February, 2021