Keegan Cove

Vector Superradiance without Separability: Instability Rates from the Worldline Effective Theory

We use a point-particle effective field theory to study the superradiant instability rates of an ultralight massive vector around a slowly rotating black hole. Earlier effective-theory treatments reported an apparent $O(1)$ discrepancy with the rates obtained by solving the Proca equation on a fixed black-hole backgrou...