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 …

We review recent works on the dynamics of circumbinary accretion, including time variability,
angular momentum transfer between the disk and the binary, and the secular evolution of …

The NANOGrav and other pulsar timing arrays (PTAs) have recently announced evidence
for nHz gravitational waves (GWs) that may originate from supermassive black hole (SMBH) …

The astrophysical origin of gravitational wave (GW) events discovered by LIGO/VIRGO
remains an outstanding puzzle. In active galactic nuclei (AGNs), compact-object binaries …

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

Primordial black holes (PBHs) have long been a candidate for the elusive dark matter (DM),
and remain poorly constrained in the∼ 20–100 M⊙ mass range. PBH binaries were …

We propose a space-based interferometer surveying the gravitational wave (GW) sky in the
milli-Hz to μ-Hz frequency range. By the 2040s, the μ-Hz frequency band, bracketed in …

The quest for binary and dual supermassive black holes (SMBHs) at the dawn of the multi-
messenger era is compelling. Detecting dual active galactic nuclei (AGN)–active SMBHs at …

Motivated by the increasing number of detections of merging black holes by LIGO-VIRGO-
KAGRA, black hole (BH) binary mergers in the discs of active galactic nuclei (AGNs) is …

We carry out 2D viscous hydrodynamical simulations of circumbinary accretion using the
moving-mesh code AREPO. We self-consistently compute the accretion flow over a wide …