If neutrinos dominate the mass density of the Universe, they play a critical role in the gravitational instability theory of galaxy formation. For neutrinos of mass 30m₃₀ eV, a maximum Jeans mass M_νm≈4×10¹⁵m₃₀^-2M_ is derived. On smaller scales, neutrino fluctuations are damped, and the growth of baryon fluctuations is greatly inhibited. Structures on scales >M_νm may collapse, forming galaxies as in Zel'dovich's "pancake" theory.
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Bond et al. (1980) studied this question.
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