Sterile neutrino dark matter as a consequence of nu MSM-induced lepton asymmetry

Laine M, Shaposhnikov M (2008)
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS 2008(06).

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Abstract
It has been pointed out by one of the authors ( Shaposhnikov 2008 Preprint 0804.4542) that in the nu MSM ( Standard Model extended with three right-handed neutrinos with masses smaller than the electroweak scale), there is a corner in the parameter space where CP-violating resonant oscillations among the two heaviest right-handed neutrinos continue to operate below the freeze-out temperature of sphaleron transitions, leading to a lepton asymmetry which is considerably larger than the baryon asymmetry. Consequently, the lightest right-handed (`sterile') neutrinos, which may serve as dark matter, are generated through an efficient resonant mechanism proposed by Shi and Fuller ( 1999 Phys. Rev. Lett. 82 2832 [ astro-ph/ 9810076]). We re-compute the dark matter relic density and non-equilibrium momentum distribution function in this situation with quantum field theoretic methods and, confronting the results with existing astrophysical data, derive bounds on the properties of the lightest right-handed neutrinos. Our spectra can be used as an input for structure formation simulations in warm dark matter cosmologies, for a Lyman-alpha analysis of the dark matter distribution on small scales, and for studying the properties of haloes of dwarf spheroidal galaxies.
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Laine M, Shaposhnikov M. Sterile neutrino dark matter as a consequence of nu MSM-induced lepton asymmetry. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS. 2008;2008(06).
Laine, M., & Shaposhnikov, M. (2008). Sterile neutrino dark matter as a consequence of nu MSM-induced lepton asymmetry. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2008(06).
Laine, M., and Shaposhnikov, M. (2008). Sterile neutrino dark matter as a consequence of nu MSM-induced lepton asymmetry. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS 2008.
Laine, M., & Shaposhnikov, M., 2008. Sterile neutrino dark matter as a consequence of nu MSM-induced lepton asymmetry. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2008(06).
M. Laine and M. Shaposhnikov, “Sterile neutrino dark matter as a consequence of nu MSM-induced lepton asymmetry”, JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, vol. 2008, 2008.
Laine, M., Shaposhnikov, M.: Sterile neutrino dark matter as a consequence of nu MSM-induced lepton asymmetry. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS. 2008, (2008).
Laine, Mikko, and Shaposhnikov, Mikhail. “Sterile neutrino dark matter as a consequence of nu MSM-induced lepton asymmetry”. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS 2008.06 (2008).
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