A typical galaxy is thought to contain tens of millions of stellar-mass black holes, the
collapsed remnants of once massive stars, and a single nuclear supermassive black hole …

Dark energy equation of state w (z) parametrizations with two parameters and given
monotonicity are generically either convex or concave functions. This makes them suitable …

Steady, spherically symmetric, adiabatic accretion and wind flows around nonrotating black
holes were studied for fully ionized, multicomponent fluids, which are described by a …

Transonic accretion onto astrophysical objects is a unique example of an analogue black
hole realized in nature. In the framework of acoustic geometry, we study axially symmetric …

In this series of papers, we shall present a simplistic approach to the study of particle
dynamics, fluid dynamics and numerical simulations of accretion flows and outflows around …

The secular evolution of the purely general relativistic low angular momentum accretion flow
around a spinning black hole is shown to exhibit hysteresis effects. This confirms that a …

We study the density field around z em> 4 quasars using high-quality medium spectral
resolution Echelle Spectrograph and Imager–Keck spectra (R∼ 4300, signal-to-noise ratio …

For inviscid, rotational accretion flows, both isothermal and polytropic, a simple dynamical
system analysis of the critical points has given a very accurate mathematical scheme to …

The material accreting onto Sgr A* most probably comes from the nearby stars. We analyze
the pattern of this flow at distances of a fraction of a parsec and we argue that the net …

We give the formulation and the general analysis of the rotational accretion problem on D-
dimensional spherical spacetime and investigate sonic points and critical points. First, we …