Systematic Uncertainties in Ultralight Boson Constraints from Superradiance
This review examines constraints on ultralight bosons using black-hole superradiance through electromagnetic and gravitational-wave methods. It details how spin reduction, gravitational wave emission from boson clouds, and binary interactions constrain boson masses. The analysis highlights systematic uncertainties in each method while showing how these complementary probes cover the 10^-13 to 10^-12 eV mass range.