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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:2108.10292 (astro-ph)
[Submitted on 17 Aug 2021]

Title:Viscous Dark Energy Accretion Activities : Sonic Speed, Angular Momentum and Mach Number Studies

Authors:Sandip Dutta, Promila Biswas, Ritabrata Biswas
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Abstract: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.
Comments: 19 pages, 18 figures
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
Cite as: arXiv:2108.10292 [astro-ph.CO]
  (or arXiv:2108.10292v1 [astro-ph.CO] for this version)
  https://doi.org/10.48550/arXiv.2108.10292
Journal reference: The European Physical Journal C, 81 348(2021)
Related DOI: https://doi.org/10.1140/epjc/s10052-021-09124-6

Submission history

From: Sandip Dutta [view email]
[v1] Tue, 17 Aug 2021 06:06:33 UTC (242 KB)
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