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 …

In this paper, which is of programmatic rather than quantitative nature, we aim to further
delineate and sharpen the future potential of the LISA mission in the area of fundamental …

Black hole superradiance is a powerful probe of light, weakly coupled hidden sector
particles. Many candidate particles, such as axions, generically have self-interactions that …

It was recently shown that a scalar field suitably coupled to the Gauss-Bonnet invariant G
can undergo a spin-induced linear tachyonic instability near a Kerr black hole. This …

Black hole (BH) shadows can be used to probe new physics in the form of ultralight particles
via the phenomenon of superradiant instability. By directly affecting the BH mass and spin …

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 …

Massive vector fields feature in several areas of particle physics, eg, as carriers of weak
interactions, dark matter candidates, or an effective description of photons in a plasma. Here …

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 …

We study the growth and saturation of the superradiant instability of a complex, massive
vector (Proca) field as it extracts energy and angular momentum from a spinning black hole …