The black hole uniqueness theorems state that general relativistic black holes are characterized by only three parameters: its mass M, its charge Q and its angular momentum J. Recently, however, Herdeiro and Radu have demonstrated, numerically, the existence of black holes with scalar hair and (possibly) astrophysical relevance if some of the hypothesis of these theorems are relaxed. This work was motivated by the linear analysis of Hod concerning the existence of scalar clouds around Kerr black holes, and is related to phenomenon of superradiance. In view of that, we propose a detailed and systematic study of wave scattering by black holes. In particular, the student will analyse the phenomena of superradiance, scalar clouds and quasinormal modes of black holes. A stability analysis of black holes with scalar hair and the calculation of its quasinormal modes are among the objectives of this project.
News published in Agência FAPESP Newsletter about the scholarship: