Galactic nuclei showing recurrent phases of activity and quiescence have recently been
discovered. Some have recurrence times as short as a few hours to a day and are known as …

A spinning black hole (BH) accreting from a disk of strongly magnetized plasma via a
magnetically arrested disk is known to produce an efficient electromagnetic jet powered by …

In this review, the third one in the series focused on a small two-band UV-photometry
mission, we assess possibilities for a small UV two-band photometry mission in studying …

The angular momentum of gas feeding a black hole (BH) may be misaligned with respect to
the BH spin, resulting in a tilted accretion disk. Rotation of the BH drags the surrounding …

Research on the observational appearance of black holes, both in general relativity and
modified gravity, has been in full swing since the Event Horizon Telescope Collaboration …

Black hole (Bh) X-ray binaries cycle through different spectral states of accretion over the
course of months to years. Although persistent changes in the Bh mass accretion rate are …

The conventional accretion disk lore is that magnetized turbulence is the principal angular
momentum transport process that drives accretion. However, when dynamically important …

Accreting supermassive black holes (SMBHs) produce highly magnetized relativistic jets that
tend to collimate gradually as they propagate outward. However, recent radio interferometric …

It is well established that supermassive black hole (SMBH) feedback is crucial for regulating
the evolution of massive, if not all, galaxies. However, modelling the interplay between …

General relativistic magnetohydrodynamic (GRMHD) simulations of black hole tilted disks—
where the angular momentum of the accretion flow at large distances is misaligned with …