3D simulations of the accretion process in Kerr space-time with arbitrary value of the spin parameter

Abstract

We present the results of three-dimensional general relativistic hydrodynamic simulations of adiabatic and spherically symmetric accretion in Kerr space-time. We consider compact objects with spin parameter $|a_{\ast }|\le 1$ (black holes) and with $|a_{\ast }|>1$ (super-spinars). Our full three-dimensional simulations confirm the formation of equatorial outflows for high values of $|a_{\ast }|$, as found in our previous work in 2.5 dimensions. We show that the critical value of $|a_{\ast }|$ determining the onset of powerful outflows depends mainly on the radius of the compact object. The phenomenon of equatorial outflows can hardly occur around a black hole and may thus be used to test the bound $|a_{\ast }|\le 1$ for astrophysical black hole candidates.

13 pages, 9 figures. v2: refereed version

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• Thick disk accretion in Kerr space-time with arbitrary spin parameters
• Linear perturbations of low angular momentum accretion flow in the Kerr metric and the corresponding emergent gravity phenomena
• Acoustic geometry obtained through the perturbation of the Bernoulli's constant
• Relativistic Low Angular Momentum Accretion: Long Time Evolution of Hydrodynamical Inviscid Flows