The production of about half of the heavy elements found in nature is assigned to a specific
astrophysical nucleosynthesis process: the rapid neutron-capture process (r process) …

Magnetically arrested accretion flows are thought to fuel some of the supermassive black
holes and to power their relativistic jets. We calculate and study a time sequence of linear …

Context. We explore the formation, energetics, and geometry of relativistic jets along with the
variability of their central engine. We study both fast and slowly rotating black holes and …

The collapse of a massive star with low angular momentum content is commonly thought to
result in the formation of a black hole without an accompanying bright transient. Our goal in …

We study the role of adiabatic index in determining the critical points in the transonic low
angular momentum accretion flow on to a black hole. We present the general relativistic 2D …

Context. Long gamma ray bursts (GRBs) originate from the collapse of massive, rotating
stars. Some of the GRBs exhibit much stronger variability patterns in the prompt GRB …

From low metallicity stars and the presence of radioactive isotopes in deep-sea sediments
we know that the main r-process, producing the heaviest elements, is a rare event. The …

We investigate the accretion-induced spin-up of the black hole via numerical simulations.
Our method is based on general relativistic magnetohydrodynamics of the slowly rotating …

Under the assumption that a gamma-ray burst (GRB) is ultimately produced by a Blandford–
Znajek (BZ) jet from a highly spinning black hole (BH), we put limits on the magnetic field …

Accretion powers relativistic jets in GRBs, similarly to other jet sources. Black holes that are
at heart of long GRBs, are formed as the end product of stellar evolution. At birth, some of the …