Though we may still doubt the exact driving mechanism of turbulence in each particular case (ISM, MC, circum-BH/-stellar discs, atmospheres...), can I say that in a sphere of dark matter particles no turbulence develops because they are collisionless? And on the contrary, a sphere of self-gravitating fermions inevitably develops turbulence (in this or another way) because the particles experience collisions? (Even in case of magnetic turbulence, the dissipation of the currents is due to collisions).
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