How Cold Dark Matter Theory Explains Milgrom's Law

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  • 9 August 2001
Abstract
Milgrom noticed the remarkable fact that the gravitational effect of dark matter in galaxies only becomes important where accelerations are less than about 10^{-8} cm s^{-2} sim cH_0. This forms the basis for his Modified Newtonian Dynamics (MOND), an alternative to particle dark matter. We show that in the Cold Dark Matter (CDM) theory of structure formation Milgrom's Law comes about automatically, owing to the scale-free character of the density perturbations, baryonic dissipation and numerical coincidences. With the evidence for CDM mounting, and at the same time problems for MOND becoming more numerous, it appears that Milgrom's Law is an accident rather than an important clue to the dark-matter puzzle.

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