We present a pseudo-Newtonian potential for accretion disk modeling around the rotating black holes. This potential can describe the general relativistic effects on accretion disk. As the inclusion of rotation in a proper way is very important at an inner edge of disk the potential is derived from the Kerr metric. This potential can reproduce all the essential properties of general relativity w...

We discuss three applications of a gauge theory of gravity to rotating as-trophysical systems. The theory employs gauge fields in a flat Minkowski background spacetime to describe gravitational interactions. The iron fluo-rescence line observed in AGN is discussed, assuming that the line originates from matter in an accretion disk around a Kerr (rotating) black hole. Gauge-theory gravity, expre...

We examine the effect of self-gravity in a rotating thick-disk equilibrium in the presence of a dipolar magnetic field. In the first part, we find a self-similar solution for non-self-gravitating disks. The solution that we have found shows that the pressure and density equilibrium profiles are strongly modified by a self-consistent toroidal magnetic field. We introduce 3 dimensionless variable...

Abstract The accretion disk is formed by particles moving in closed orbits around a compact object, whose physical properties and the electromagnetic radiation characteristics are determined space-time geometry object. In this paper, we study optical appearance of emitted from thin two types black hole solution Einstein-Æther theory. We investigate detail effects æther field on energy flux, tem...

The flow of a liquid film over a rapidly rotating horizontal disk has numerous industrial applications including pharmaceuticals, chemical engineering, bioengineering, etc. The analysis and control of complex fluid flows over a rapidly rotating horizontal disk is an important issue in the experimental fluid mechanics. The spinning disk reactor exploits the benefits of centrifugal force, which p...

A detailed solution of an initial value problem of a vertically localized initial perturbation in rotating magnetized vertically stratified disk is presented. The appropriate linearized MHD equations are solved by employing the WKB approximation and the results are verified numerically. The eigenfrequencies as well as eigenfunctions are explicitly obtained. It is demonstrated that the initial p...

We have obtained high signal-to-noise spectra along the major axes of 28 S0 galaxies in order to search for the presence of disk stars on retrograde orbits. Full line-of-sight velocity distributions were extracted from the data, and the velocity distributions were modelled as arising from the superposition of populations of stars on prograde and retrograde orbits. We find no new cases in which ...

The thermal radiation properties of the accretion disk around a non-rotating black hole with perfect fluid dark matter (PFDM) environment are investigated. A surrounded by together classical geometrically thin but optically thick Novikov–Thorne is selected as system to be analyzed. It observed that strengthens gravitational field, which leads both increase radii event horizon and innermost stab...

Using two-dimensional hydrodynamical simulations, we followed the evolution of a dynamically-collapsing, rotating disk permeated by vertical magnetic eld. As a model of a disk, the similarity solution for isothermal, rotating, and magnetized disks are adopted. The disk deforms into a bar during its contraction. In the early stage, the deformation of the disk grows in proportion to (t 0 t) 0:6 ,...

We present a pseudo-Newtonian potential for accretion disk modeling around rotating black holes. This potential can describe the general relativistic effects in accretion disk properly. As the inclusion of rotation in a proper way is very important at the inner edge of the disk we derived our potential starting from the Kerr metric. This potential can reproduce all the essential properties of g...