Scalarization is a mechanism that endows strongly self-gravitating bodies, such as neutron
stars and black holes, with a scalar-field configuration. It resembles a phase transition in that …

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

Searching for violations of the no-hair theorem (NHT) is a powerful way to test gravity, and
more generally fundamental physics, particularly with regards to the existence of additional …

Extended scalar-tensor Gauss-Bonnet (ESTGB) gravity has been recently argued to exhibit
spontaneous scalarization of vacuum black holes (BHs). A similar phenomenon can be …

Ultralight bosons can induce superradiant instabilities in spinning black holes, tap** their
rotational energy to trigger the growth of a bosonic condensate. Possible observational …

For dark matter to be detectable with gravitational waves from binary black holes, it must
reach higher than average densities in their vicinity. In the case of light (wavelike) dark …

The process of superradiance can extract angular momentum and energy from astrophysical
black holes (BHs) to populate gravitationally bound states with an exponentially large …

Can a dynamically robust bosonic star (BS) produce an (effective) shadow that mimics that
of a black hole (BH)? We focus on models of spherical BSs with free scalar or vector fields …

Gravitational waves can provide crucial insights about the environments in which black
holes live. In this work, we use numerical relativity simulations to study the behavior of self …

Spontaneous scalarisation of electrically charged, asymptotically flat Reissner–Nordström
black holes (BHs) has been recently demonstrated to occur in Einstein–Maxwell–Scalar …