Galactic nuclei harbouring a central supermassive black hole (SMBH), possibly surrounded
by a dense nuclear cluster (NC), represent extreme environments that house a complex …

Blazars are very broadband cosmic sources with spectra spanning over twenty orders of
magnitude in frequency, down to the 100 MHz regime in the radio range, up to VHE at …

The accretion disks of active galactic nuclei (AGNs) are promising locations for the merger of
compact objects detected by gravitational wave (GW) observatories. Embedded within a …

In this paper, we study how gaseous dynamical friction (DF) affects the motion of fly-by
stellar-mass black holes (sBHs) embedded in active galactic nucleus (AGN) discs. We …

Binaries of relatively massive black holes like GW190521 have been proposed to form in
dense gas environments, such as the disks of active galactic nuclei (AGNs), and they might …

Galactic nuclei are promising sites for stellar origin black hole (BH) mergers, as part of
merger hierarchies in deep potential wells. We show that binary black hole (BBH) merger …

The origin of stellar-mass black hole mergers discovered through gravitational waves is
being widely debated. Mergers in the disks of active galactic nuclei (AGNs) represent a …

The active galactic nucleus (AGN) disc has been proposed as a potential channel for the
merger of binary black holes. The population of massive stars and black holes in AGN discs …

We study the long-term evolution of two or more stellar black holes (BHs) on initially
separated but unstable circular orbits around a supermassive BH (SMBH). Such a close …

Stellar-mass black holes (sBHs) embedded in gaseous disks of active galactic nuclei (AGN)
can be important sources of detectable gravitational radiation for LIGO/Virgo when they form …