The advent of gravitational waves and black hole imaging has opened a new window into
probing the horizon scale of black holes. An important question is whether string theory …

There is a broad consensus that accretion onto supermassive black holes and consequent
jet formation power the observed emission from active galactic nuclei (AGNs). However …

The design and implementation of a new framework for adaptive mesh refinement
calculations are described. It is intended primarily for applications in astrophysical fluid …

Hot spots, or plasmoids, which form due to magnetic reconnection in current sheets, are
conjectured to power frequent X-ray and near-infrared flares from Sgr A*, the black hole in …

Abstract The LIGO and Virgo Interferometers have so far provided 11 gravitational-wave
(GW) observations of black-hole binaries. Similar detections are bound to become very …

The Event Horizon Telescope (EHT) is a millimeterwavelength, Earth-sized very long
baseline interferometry experiment that has recently imaged the shadow of the black hole …

The production and acceleration mechanisms of ultrahigh-energy cosmic rays (UHECRs) of
energy> 10 20 eV, clearly beyond the GZK cutoff limit, remain unclear, which points to the …

One of the main dissipation processes acting on all scales in relativistic jets is thought to be
governed by magnetic reconnection. Such dissipation processes have been studied in …

Black hole (BH) accretion is one of nature's most efficient energy extraction processes.
When gas falls in, a significant fraction of its gravitational binding energy is either converted …

We model a compact black hole-accretion disk system in the collapsar scenario with full
transport, frequency dependent, general relativistic radiation magnetohydrodynamics. We …