= Joel Primack
{c}
<Joel Primack> helped formulate <cold dark matter> as a quantitative framework for <galaxy formation>. The 1984 study with <George R. Blumenthal>, <Sandra Faber> and <Martin Rees> linked a primordial fluctuation spectrum to the formation of <galaxies> and <galaxy clusters> when collisionless particles have sufficiently small early <velocity dispersion>.<Formation of galaxies and large-scale structure with cold dark matter by George R. Blumenthal and others>[Abstract and introductory formulation of cold collisionless matter]{ref}
Here “cold” concerns the particles' early random <velocities>, not whether the later <galaxies> are thermally cold.
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