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Accretion disc viscosity: how big is alpha?

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arxiv astro-ph/0701803 v1 pith:MDZYKSMR submitted 2007-01-29 astro-ph

A. R. King , J. E. Pringle & M. Livio This is my paper · ORCID
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keywords alphaaccretiondiscestimatesobservationalviscosityapparentbest
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abstract

We consider observational and theoretical estimates of the accretion disc viscosity parameter $\alpha$. We find that in thin, fully-ionized discs, the best observational evidence suggests a typical range $\alpha \sim 0.1 - 0.4$, whereas the relevant numerical simulations tend to derive estimates for $\alpha$ which are an order of magnitude smaller. We discuss possible reasons for this apparent discrepancy.

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    Neutrino self-interactions inside neutrino-cooled accretion disks are argued to push flavors toward equipartition, reducing the neutrino-antineutrino annihilation energy deposition around black holes by a factor up to...

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