Abstract
Sterile neutrinos provide active neutrinos with masses and mixing, and hence is one of the well-motivated candidate for dark matter. We discuss the sterile neutrino production mechanisms operating in the early Universe and show that additional scalar coupled to sterile neutrino can significantly change the situation, making moderate sterile-neutrino mixing and small sterile neutrino masses consistent with current cosmological and astrophysical bounds. Further searches for a narrow line in galactic X -rays and even direct searches for keV-scale sterile neutrinos in particle physics experiments can probe the suggested setup.
Highlights
Charged fermion sector of the Standard Model of particle physics (SM) exhibits perfect symmetry between left-handed and right-handed particles
Sterile neutrino mass is of Majorana type, so we introduce only two√degrees of freedom
The reason was that the model parameters, sterile neutrino mass and sterile-active mixing angle, were consistent with predictions of one of the realistic mechanisms of sterile neutrino production in the early Universe due to oscillations in primordial plasma
Summary
Charged fermion sector of the Standard Model of particle physics (SM) exhibits perfect symmetry between left-handed and right-handed particles. The neutrino emerges in a weak processes as a particular flavor state, recasts into the mass eigenstates which propagate for some distance and must be recast back into the flavor eigenstates to describe the neutrino detection by weak interactions. Electron neutrinos of high energies do not oscillate inside the Sun: the weak interactions are sufficiently fast to prevent this processes by collapsing the neutrino wave function back into the flavor basis.
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