| Issue |
EAS Publications Series
Volume 36, 2009
Dark Energy and Dark Matter: Observations, Experiments and Theories
|
|
|---|---|---|
| Page(s) | 193 - 195 | |
| DOI | https://doi.org/10.1051/eas/0936027 | |
| Published online | 30 May 2009 | |
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
E. Pécontal, T. Buchert, Ph. Di Stefano and Y. Copin (eds)
EAS Publications Series, 36 (2009) 193-195
Fourth generation neutrinos as dark matter
Physical Research Laboratory, India
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 Ωm ~ 0.25. 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