Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-11-22
Phys.Rev.D73:063506,2006
Astronomy and Astrophysics
Astrophysics
v4: matches version in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.73.063506
Sterile neutrinos, fermions with no standard model couplings [SU(2) singlets], are predicted by most extensions of the standard model, and may be the dark matter. I describe the nonthermal production and linear perturbation evolution in the early universe of this dark matter candidate. I calculate production of sterile neutrino dark matter including effects of Friedmann dynamics dictated by the quark-hadron transition and particle population, the alteration of finite temperature effective mass of active neutrinos due to the presence of thermal leptons, and heating of the coupled species due to the disappearance of degrees of freedom in the plasma. These effects leave the sterile neutrinos with a non-trivial momentum distribution. I also calculate the evolution of sterile neutrino density perturbations in the early universe through the linear regime and provide a fitting function form for the transfer function describing the suppression of small scale fluctuations for this warm dark matter candidate. The results presented here differ quantitatively from previous work due to the inclusion here of the relevant physical effects during the production epoch.
No associations
LandOfFree
Production and Evolution of Perturbations of Sterile Neutrino Dark Matter does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Production and Evolution of Perturbations of Sterile Neutrino Dark Matter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Production and Evolution of Perturbations of Sterile Neutrino Dark Matter will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-383559