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We study the role of adiabatic index in determining the critical points inthe transonic low angular momentum accretion flow onto a black hole. We presentthe general relativistic 2D hydrodynamic simulations of axisymmetric, inviscidaccretion flows in a fixed Kerr black hole gravitational field. A relativisticfluid where its bulk velocity is comparable to the speed of light, flowing inthe accretion disk very close to the horizon can be described by an adiabaticindex of 4/3 < {\gamma} < 5/3. The time dependent evolution of the shockposition and respective effects on mass accretion rate and oscillationfrequency with varying adiabatic index is discussed in the context of theobserved microquasars.

Effects of adiabatic index on the sonic surface and time variability of low angular momentum accretion flows