Long-lived resonances of massive scalar fields in the Reissner–Nordström black-hole spacetime: Analytic treatment in the large-mass regime

The physical and mathematical properties of the composed Reissner-Nordström-black-hole-massive-scalar-field system are studied analytically in the dimensionless large-mass Mμ ≫ 1 regime [here { M, μ } are respectively the mass of the central black hole and the proper mass of the scalar field]. It is proved that, for a given value Q ¯ ≡ Q / M of the dimensionless charge parameter of the central black hole, the system is characterized by the presence of quasi-resonances, linearized perturbation modes with arbitrarily long lifetimes. In particular, using analytical techniques, we determine the black-hole-field critical mass spectrum { M μ crit ( Q ¯ ) } which characterizes the long-lived resonances of the composed physical system.