Abstract The Laser Interferometer Space Antenna (LISA) will be a transformative experiment
for gravitational wave astronomy, and, as such, it will offer unique opportunities to address …

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 …

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

We introduce a family of solutions of Einstein's gravity minimally coupled to an anisotropic
fluid, describing asymptotically flat black holes with “hair” and a regular horizon. These …

Previous works have argued that future gravitational-wave detectors will be able to probe
the properties of astrophysical environments where binaries coalesce, including accretion …

Future gravitational wave interferometers such as the Laser Interferometer Space Antenna,
Taiji, DECi-hertz Interferometer Gravitational wave Observatory and TianQin will enable …

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 …

We develop a numerical approach to find asymptotically flat black hole solutions coupled to
anisotropic fluids, described by generic density profiles. Our model allows for a variety of …

Gravitational-wave observations of extreme mass ratio inspirals (EMRIs) offer the
opportunity to probe the environments of active galactic nuclei (AGN) through the torques …