Abstract
One of the simplest, yet most profound, questions we can ask about the Universe is, How much stuff is in it, and further what is that stuff composed of? Needless to say, the answer to this question has very important implications for the evolution of the Universe, determining both the ultimate fate and the course of structure formation. Remarkably, at this late date in the history of the Universe we still do not have a definitive answer to this simplest of questions—although we have some very intriguing clues. It is known with certainty that most of the material in the Universe is dark, and we have the strong suspicion that the dominant component of material in the Cosmos is not baryons, but rather is exotic relic elementary particles left over from the earliest, very hot epoch of the Universe. If true, the Dark Matter question is a most fundamental one facing both particle physics and cosmology. The leading particle dark matter candidates are: the axion, the neutralino, and a light neutrino species. All three candidates are accessible to experimental tests, and experiments are now in progress. In addition, there are several dark horse, long shot, candidates, including the superheavy magnetic monopole and soliton stars.
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© 1989 Kluwer Academic Publisher
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Turner, M.S. (1989). Dark Matter Candidates. In: Caffo, M., Fanti, R., Giacomelli, G., Renzini, A. (eds) Astronomy, Cosmology and Fundamental Physics. Astrophysics and Space Science Library, vol 155. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0965-6_18
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DOI: https://doi.org/10.1007/978-94-009-0965-6_18
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