Abstract
We investigate the accretion process for different spherically symmetric space-time geometries for a static fluid. We analyse this procedure using the most general black hole metric ansatz. After that, we examine the accretion process for specific spherically symmetric metrics obtaining the velocity of the sound during the process and the critical speed of the flow of the fluid around the black hole. In addition, we study the behaviour of the rate of change of the mass for each chosen metric for a barotropic fluid.
Highlights
Accretion is the process by which a massive astrophysical object such as a black hole or a star can take particles from a fluid from its vicinity which leads to increase in mass of the accreting body [8–11]
Other processes of formation of giant black holes such as merger of several small mass black holes or stellar collapse of several stars in a small domain leading to merger seem very remote possibilities
Since the Universe is dominated by dark energy, it is more pertinent to study the accretion of various forms of dark energy onto black holes
Summary
Accretion is the process by which a massive astrophysical object such as a black hole or a star can take particles from a fluid from its vicinity which leads to increase in mass (and possibly angular momentum) of the accreting body [8–11]. It is one of the most ubiquitous processes in the Universe. Other processes of formation of giant black holes such as merger of several small mass black holes (or compact objects) or stellar collapse of several stars in a small domain leading to merger seem very remote possibilities.
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