Theory of Turbulent Accretion Disks

Details Theory of Turbulent Accretion Disks Theory of Turbulent Accretion Disks

2001-07-20

arxiv.org/abs/astro-ph/0107408v1

Astronomy and Astrophysics

Astrophysics

25 pages, LaTex, To appear in the proceedings of the Aussois 2000 summer school ``Formation Stellaire et Physique des Etoiles

Scientific paper

In low-mass disks, turbulent torques are probably the most important way of redistributing angular momentum. Here we present the theory of turbulent accretion disks. We show the molecular viscosity is far too small to account for the evolutionary timescale of disks, and we describe how turbulence may result in enhanced transport of (angular) momentum. We then turn to the magnetorotational instability, which thus far is the only mechanism that has been shown to initiate and sustain turbulence in disks. Finally, we present both the basis and the structure of alpha disk models.

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