Jul 4 – 11, 2018
COEX, SEOUL
Asia/Seoul timezone

Extremely weak and super-efficient production of keV sterile neutrino: phase transition and induced parametric resonance creation.

Jul 7, 2018, 12:15 PM
15m
104 (COEX, Seoul)

104

COEX, Seoul

Parallel Astro-particle Physics and Cosmology Astro-particle Physics and Cosmology

Speaker

Anton Chudaykin (Institute for Nuclear Research)

Description

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. In particular, we firstly explore the hidden sector with the phase transition which makes the sterile neutrinos massless and oscillations inefficient in the early Universe. In the second case, we introduce the feebly interacting scalar field which oscillates at late times and can compose all Dark Matter today avoiding any structure formation constraints.

Primary authors

Anton Chudaykin (Institute for Nuclear Research) Dmitry Gorbunov (Russian Academy of Sciences (RU)) Fedor Bezrukov (University of Manchester (GB))

Presentation materials