Abstract
So far analysis of the quasinormal spectrum of a massive charged scalar field in the black hole background has been limited by the regime of small and , where , are mass and charge of the field (black hole). Here we shall present a comprehensive picture of quasinormal modes, late-time tails and stability of a massive charged scalar field around Kerr-Newman black holes for any physically meaningful values of the parameters. We shall show that despite the presence of the two mechanisms of superradiance (owing to black hole’s rotation and charge) and the massive term creating growing bound states, there is no indication of instability under the quasinormal modes’ boundary conditions. We have shown that for some moderate values of dominant quasinormal modes may have arbitrarily small real oscillation frequencies . An analytic formula for the quasinormal modes has been derived in the regime of large . The larger the field’s charge, the sooner asymptotic tails dominate in a signal, making it difficult to extract quasinormal frequencies from a time-domain profile. Analytic expressions for intermediate and asymptotically late-time tails have been found for the Reissner-Nordström black hole. For the near extremal Kerr-Newman black holes we have obtained a more general picture of the mode branching found recently for massless fields [arXiv:1212.3271] in the Kerr background.
3 More- Received 6 July 2013
DOI:https://doi.org/10.1103/PhysRevD.88.024054
© 2013 American Physical Society