New Light on Dark Matter

Details New Light on Dark Matter New Light on Dark Matter

2003-06-19

arxiv.org/abs/astro-ph/0306402v1

Science 300:1909-1913,2003

Astronomy and Astrophysics

Astrophysics

18 pages, 5 figures

Scientific paper

10.1126/science.1085976

Dark matter, proposed decades ago as a speculative component of the universe, is now known to be the vital ingredient in the cosmos, eight times more abundant than ordinary matter, one quarter of the total energy density and the component which has controlled the growth of structure in the universe. Its nature remains a mystery, but, assuming it is comprised of weakly interacting sub-atomic particles, is consistent with large scale cosmic structure. However, recent analyses of structure on galactic and sub-galactic scales have suggested discrepancies and stimulated numerous alternative proposals. We discuss how studies of the density, demography, history and environment of smaller scale structures may distinguish among these possibilities and shed new light on the nature of dark matter.

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