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Dark Matter: Astronomical Aspects

Published online by Cambridge University Press:  30 March 2016

Virginia Trimble
Virginia Trimble*
Affiliation:
Department of Physics and Astronomy, University of California, Irvine CA 92697USA, and Astronomy Department, University of Maryland, College Park MD 20742USA

Abstract

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The chief evidence for appreciable dark matter in the universe comes from the monotonic increase in mass to light ratios measured for various astronomical systems as one looks on larger and larger length scales. Though the evidence comes from photons, most of the dark matter is non-photonic, and, for that matter, non-baryonic. There remain several questions about the nature and behavior of dark matter to which conventional astronomical observations are (probably) relevant. The most germain to this JD is whether astronomers have seen decay or annihilation products from dark matter particles, to which the current answer seems to be no. We look at a few of the others.

Type
I. Joint Discussions
Information
Highlights of Astronomy , Volume 13 , 2005 , pp. 42 - 44
Copyright
Copyright © Astronomical Society of Pacific 2005

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