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Dark Energy and Dark Matter: Observations, Experiments and Theories
E. Pécontal, T. Buchert, Ph. Di Stefano and Y. Copin (eds)
EAS Publications Series, 36 (2009) 193-195
DOI: 10.1051/eas/0936027
Fourth generation neutrinos as dark matter
S. MohantyPhysical Research Laboratory, India
Published online: 30 May 2009
Abstract
A pseudo-Dirac neutrino of mass 50–100 GeV and mass splitting of
5 GeV can be a good candidate for dark matter. The number density
of such dark matter should be close the the baryon density in order
to get a dark matter density
. Production of
heavy neutrinos by electro-weak sphaleron processes can ensure that
the heavy neutrino asymmetry be of the same order as the baryon
asymmetry. A mass splitting of the order.
© EAS, EDP Sciences 2009
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