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Time variability of...
Time variability of viscosity parameter in differentially rotating discs
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Rajesh, S. R. (författare)
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- Singh, Nishant K. (författare)
- KTH,Stockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),Inter-University Centre for Astronomy & Astrophysics, India,Nordic Institute for Theoretical Physics NORDITA
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(creator_code:org_t)
- Elsevier BV, 2014
- 2014
- Engelska.
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Ingår i: New astronomy. - : Elsevier BV. - 1384-1076 .- 1384-1092. ; 30, s. 38-45
- Relaterad länk:
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http://arxiv.org/pdf...
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visa fler...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- Accretion
- Accretion discs
- Hydrodynamics
- X-rays: binaries
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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