George R. Blumenthal helped formulate the cold dark matter account of the formation of galaxies and larger cosmic structures. The 1984 paper with Sandra Faber, Joel Primack and Martin Rees considered matter whose early velocity dispersion was sufficiently small that free streaming would not erase fluctuations on galactic scales.
This connects a proposed microscopic property of dark matter to observable cosmic structure: surviving density fluctuations grow through gravity, and their initial spectrum constrains the later distribution of galaxies. The paper evaluated a model with calculable consequences, rather than merely adding unseen mass to individual systems.[ref]
Formation of galaxies and large-scale structure with cold dark matter by George R. Blumenthal and others. Abstract: collisionless cold particles, undamped galactic-scale fluctuations and predictive fluctuation spectrum
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