Galaxy formation by dissipationless particles heavier than neutrinos

  title={Galaxy formation by dissipationless particles heavier than neutrinos},
  author={George R. Blumenthal and Heinz R. Pagels and Joel R. Primack},
In a baryon dominated universe, there is no scale length corresponding to the masses of galaxies. If neutrinos with mass <50eV dominate the present mass density of the universe, then their Jeans mass MJv ∼ 1016M\circ&#x0307;, which resembles supercluster rather than galactic masses. Neutral particles that interact much more weakly than neutrinos would decouple much earlier, have a smaller number density today, and consequently could have a mass >50 eV without exceeding the observational mass… Expand
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