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Cosmology's CenturyAn Inside History of Our Modern Understanding of the Universe$
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P. J. E. Peebles

Print publication date: 2020

Print ISBN-13: 9780691196022

Published to Princeton Scholarship Online: January 2021

DOI: 10.23943/princeton/9780691196022.001.0001

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Nonbaryonic Dark Matter

Nonbaryonic Dark Matter

(p.279) Chapter Seven Nonbaryonic Dark Matter
Cosmology's Century

P. J. E. Peebles

Princeton University Press

This chapter discusses the particle physicists' considerations of nonbaryonic matter. It takes into account the condition that if this nonbaryonic matter were produced in the hot early stages of expansion of the universe, then its remnant mass density must not exceed that allowed by the relativistic big bang cosmological model (again, assuming the relativistic theory). But it is notable that cosmologists took over the notion of nonbaryonic dark matter before the particle physics community had taken much interest in the astronomers' evidence of the presence of subluminal matter. The nonbaryonic dark matter most broadly discussed in the 1980s came in two varieties, cold and hot. The latter would be one of the known class of neutrinos with rest mass of a few tens of electron volts. The initially hot (meaning rapidly streaming) neutrinos in the early universe would have smoothed the mass distribution, and that smoothing would have tended to cause the first generation of structure to be massive systems that must have fragmented to form galaxies.

Keywords:   particle physicists, nonbaryonic dark matter, expanding universe, mass density, big bang cosmological model, relativistic theory, cosmologists, hot dark matter, cold dark matter, neutrinos

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