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

We consider the status of black hole (BH) solutions with nontrivial scalar fields but no gauge
fields, in four-dimensional asymptotically flat spacetimes, reviewing both classical results …

One century after its formulation, Einstein's general relativity (GR) has made remarkable
predictions and turned out to be compatible with all experimental tests. Most of these tests …

Technological advances in controlling and manipulating fluids have enabled the
experimental realization of acoustic analogues of gravitational black holes. A flowing fluid …

Superradiant instabilities of spinning black holes (BHs) can be used to impose strong
constraints on ultralight bosons, thus turning BHs into effective particle detectors. However …

Bekenstein proved that in Einstein's gravity minimally coupled to one (or many) real,
Abelian, Proca field, stationary black holes (BHs) cannot have Proca hair. Dropping …

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 …

We use the continued fraction method to determine the eigenfrequencies associated with a
scalar field around a Kerr-like black hole. The Kerr-like metric considered in this article is a …

The maximal Arnowitt-Deser-Misner (ADM) mass for (mini) boson stars (BSs)—gravitating
solitons of Einstein's gravity minimally coupled to a free, complex, mass μ, Klein-Gordon field …

Recently, spherical and static flat space solitons (balls) and self-gravitating, everywhere
regular, asymptotically flat solitons (stars) were constructed in an Einstein-Proca-Higgs …