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

We establish a generic, fully relativistic formalism to study gravitational-wave emission by
extreme-mass-ratio systems in spherically symmetric, nonvacuum black hole spacetimes …

Ultralight bosons can affect the dynamics of spinning black holes (BHs) via superradiant
instability, which can lead to a time evolution of the supermassive BH shadow. We study …

Ultralight bosons and axion-like particles appear naturally in different scenarios and could
solve some long-standing puzzles. Their detection is challenging, and all direct methods …

Black holes (BHs) in general relativity (GR) are very simple objects. This property, that goes
under the name of'no-hair', has been refined in the last few decades and admits several …

The tidal Love numbers (TLNs) encode the deformability of a self-gravitating object
immersed in a tidal environment and depend significantly both on the object's internal …

Deep conceptual problems associated with classical black holes can be addressed in string
theory by the “fuzzball” paradigm, which provides a microscopic description of a black hole …

In preparation for future space-borne gravitational-wave (GW) detectors, should the
modelling effort focus on high-precision vacuum templates or on the astrophysical …

Black hole solutions in general relativity are simple. The frequency spectrum of linear
perturbations around these solutions (ie, the quasinormal modes) is also simple, and …