Viscous Dark Energy Accretion Activities : Sonic Speed, Angular Momentum
  and Mach Number Studies
  In this present article, we study different accretion properties regarding
viscous accretion of dark energy. Modified Chaplygin gas is chosen as the dark
energy candidate. Viscosity is encountered with the help of Shakura-Sunyaev
viscosity parameter. We study sonic speed vs radial distance curves. We compare
between adiabatic and dark energy dominated cases and follow that sonic speed
falls as we go nearer to the central gravitating object. As viscosity is
imposed, a threshold drop in accretion sonic speed is followed. Average rate of
fall in accretion sonic speed is increased with black hole's spin. This is
signifying that this kind of accretion is weakening the overall matter/energy
infall. Specific angular momentum to Keplerian angular momentum ratio is found
to fall as we go far from the black hole. Accretion Mach number turns high as
we go towards the inner region and high wind Mach number is not allowed as we
are going out. Combining, we conclude that the system weakens the feeding
process of accretion.
