Hiding an elephant: heavy sterile neutrino with large mixing angle does not contradict cosmology

We study a model of a keV-scale sterile neutrino with a relatively large mixing with the Standard Model sector. Usual considerations predict active generation of such particles in the early Universe, which leads to constraints from the total Dark Matter density and absence of X-ray signal from steri...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2017-06, Vol.2017 (6), p.51-51
Main Authors: Bezrukov, F., Chudaykin, A., Gorbunov, D.
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COSMOLOGY
DENSITY
KEV RANGE
MASS
MIXING ANGLE
NONLUMINOUS MATTER
OSCILLATIONS
PARTICLE DECAY
PLASMA
STANDARD MODEL
STERILE NEUTRINOS
UNIVERSE
X RADIATION
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Summary:We study a model of a keV-scale sterile neutrino with a relatively large mixing with the Standard Model sector. Usual considerations predict active generation of such particles in the early Universe, which leads to constraints from the total Dark Matter density and absence of X-ray signal from sterile neutrino decay. These bounds together may deem any attempt of creation of the keV scale sterile neutrino in the laboratory unfeasible. We argue that for models with a hidden sector coupled to the sterile neutrino these bounds can be evaded, opening new perspectives for the direct studies at neutrino experiments such as Troitsk ν-mass and KATRIN. We estimate the generation of sterile neutrinos in scenarios with the hidden sector dynamics keeping the sterile neutrinos either massless or superheavy in the early Universe. In both cases the generation by oscillations from active neutrinos in plasma is suppressed.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2017/06/051