Gravito-turbulence and the excitation of small-scale parametric instability in astrophysical discs

A Riols, Henrik Latter & S-J Paardekooper
Young protoplanetary discs and the outer radii of active galactic nuclei may be subject to gravitational instability and, as a consequence, fall into a ‘gravitoturbulent’ state. While in this state, appreciable angular momentum can be transported; alternatively, the gas may collapse into bound clumps, the progenitors of planets or stars. In this paper, we numerically characterize the properties of 3D gravitoturbulence, focusing especially on its dependence on numerical parameters (resolution, domain size) and its excitation...
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