Time variability of low angular momentum accretion flows around black hole

TL;DR

This paper uses relativistic 2D and 3D GRMHD simulations to study the time variability of low angular momentum accretion flows around Kerr black holes, focusing on shock dynamics and oscillations near the horizon.

Contribution

It provides new insights into the shock behavior and oscillation frequencies in low angular momentum accretion flows using relativistic simulations.

Findings

Shock position varies with time and affects accretion rates.

Oscillation frequencies depend on the adiabatic index.

Flow dynamics near the horizon are characterized for low angular momentum cases.

Abstract

We present the relativistic 2D and 3D GRMHD simulation of axisymmetric, inviscid, hydrodynamic accretion flows in a fixed Kerr black hole gravitational field. The flow is having low angular momentum with respect to Keplerian one. A relativistic fluid where its bulk velocity is comparable to the speed of light, flowing in the accretion disk very close to the horizon should be described by adiabtic index: 4=3 < g < 5=3 .The time dependent evolution of shock position and respective effect on mass accretion rate and oscillation frequency with varying adiabatic index has been studied. Here we present some of the results for adiabatic index = 1.4 in a 2D and 3D model.