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Time variability of viscosity parameter in differentially rotating discs
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Inter-University Centre for Astronomy & Astrophysics, India.
2014 (English)In: New astronomy, ISSN 1384-1076, Vol. 30, 38-45 p.Article in journal (Refereed) Published
Abstract [en]

We propose a mechanism to produce fluctuations in the viscosity parameter (a) in differentially rotating discs. We carried out a nonlinear analysis of a general accretion flow, where any perturbation on the background a was treated as a passive/slave variable in the sense of dynamical system theory. We demonstrate a complete physical picture of growth, saturation and final degradation of the perturbation as a result of the nonlinear nature of coupled system of equations. The strong dependence of this fluctuation on the radial location in the accretion disc and the base angular momentum distribution is demonstrated. The growth of fluctuations is shown to have a time scale comparable to the radial drift time and hence the physical significance is discussed. The fluctuation is found to be a power law in time in the growing phase and we briefly discuss its statistical significance.

Place, publisher, year, edition, pages
2014. Vol. 30, 38-45 p.
Keyword [en]
Accretion, Accretion discs, Hydrodynamics, X-rays: binaries
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-103258DOI: 10.1016/j.newast.2014.01.011ISI: 000333493100005OAI: diva2:719371


Available from: 2014-05-23 Created: 2014-05-12 Last updated: 2014-05-23Bibliographically approved

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Nordic Institute for Theoretical Physics (Nordita)
Astronomy, Astrophysics and Cosmology

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