GeV-scale hot sterile neutrino oscillations: a numerical solution

Ghiglieri, Jacopo; Laine, Mikko Sakari (2018). GeV-scale hot sterile neutrino oscillations: a numerical solution. Journal of High Energy Physics, 2018(2) Springer 10.1007/JHEP02(2018)078

Preview

Text 10.1007-JHEP02(2018)078.pdf - Published Version Available under License Creative Commons: Attribution (CC-BY). Download (993kB) | Preview

The scenario of baryogenesis through GeV-scale sterile neutrino oscillations is governed by non-linear differential equations for the time evolution of a sterile neutrino density matrix and Standard Model lepton and baryon asymmetries. By employing up-to-date rate coefficients and a non-perturbatively estimated Chern-Simons diffusion rate, we present a numerical solution of this system, incorporating the full momentum and helicity dependences of the density matrix. The density matrix deviates significantly from kinetic equilibrium, with the IR modes equilibrating much faster than the UV modes. For equivalent input parameters, our final results differ moderately (∼50%) from recent benchmarks in the literature. The possibility of producing an observable baryon asymmetry is nevertheless confirmed. We illustrate the dependence of the baryon asymmetry on the sterile neutrino mass splitting and on the CP-violating phase measurable in active neutrino oscillation experiments.

Interest & Impact

Downloads

189 since deposited on 02 Mar 2018
16 in the past 12 months

Citations

5 Citations in Web of Science ®
6 Citations in Scopus

Search

in Google Scholar™

Services

Actions (login required)

Edit item

Actions (login required)

Edit item