Kerr black holes (BHs) with scalar hair are solutions of the Einstein–Klein–Gordon field
equations describing regular (on and outside an event horizon), asymptotically flat BHs with …

Generic extensions of the standard model predict the existence of ultralight bosonic degrees
of freedom. Several ongoing experiments are aimed at detecting these particles or …

Light bosonic degrees of freedom have become a serious candidate for dark matter, which
seems to pervade our entire Universe. The evolution of these fields around curved …

We discuss a general method to study linear perturbations of slowly rotating black holes
which is valid for any perturbation field, and particularly advantageous when the field …

Bosonic fields on rotating black hole spacetimes are subject to amplification by
superradiance, which induces exponentially-growing instabilities (the “black hole bomb”) in …

We study the propagation of a massive vector or Proca field on the Schwarzschild
spacetime. The field equations are reduced to a one-dimensional wave equation for the odd …

Physics beyond the standard model is an important candidate for dark matter, and an
interesting testing ground for strong-field gravity: the equivalence principle'forces' all forms of …

Scalar and gravitational perturbations on Kerr–anti–de Sitter (Kerr-AdS) black holes have
been addressed in the literature and have been shown to exhibit a rich phenomenology. In …

Physic in curved spacetime describes a multitude of phenomena, ranging from astrophysics
to high-energy physics (HEP). The last few years have witnessed further progress on several …

Superradiance is a radiation enhancement process that involves dissipative systems. With a
60 year-old history, superradiance has played a prominent role in optics, quantum …