Abstract The Laser Interferometer Space Antenna (LISA) has the potential to reveal wonders
about the fundamental theory of nature at play in the extreme gravity regime, where the …

70 AIM, UMR 7158, CEA/DRF, CNRS, Université Paris Diderot, Irfu/Service d'Astrophysique,
Centre de Saclay, FR-91191 Gif-sur-Yvette, France

Due to superradiant instabilities, clouds of ultralight bosons can spontaneously grow around
rotating black holes, creating so-called" gravitational atoms". In this work, we study their …

We study extreme mass-ratio binary systems in which a stellar mass compact object spirals
into a supermassive black hole surrounded by a scalar cloud. Scalar clouds can form …

Rotating black holes can produce superradiant clouds of ultralight bosons. When the black
hole is part of a binary system, its cloud can undergo resonances and ionization. These …

Light bosonic scalars (eg, axions) may form clouds around black holes via superradiant
instabilities or via accretion if they form some component of the dark matter. It has been …

The motion of S2, one of the stars closest to the Galactic Centre, has been measured
accurately and used to study the compact object at the centre of the Milky Way. It is …

Effective field theory methods suggest that some rather general extensions of general
relativity include, or are mimicked by, certain higher-order curvature corrections, with …

The interaction of binary black hole mergers with their environments can be studied using
numerical relativity simulations. These start only a short finite time before merger, at which …

We use numerical simulations of scalar field dark matter evolving on a moving black hole
background to confirm the regime of validity of (semi) analytic expressions derived from first …