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

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Ghiglieri, Jacopo and Laine, Mikko Sakari

Subjects:

500 Science > 530 Physics

ISSN:

1029-8479

Publisher:

Springer

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

02 Mar 2018 12:28

Last Modified:

04 Mar 2018 02:21

Publisher DOI:

10.1007/JHEP02(2018)078

ArXiv ID:

1711.08469

BORIS DOI:

10.7892/boris.111848

URI:

https://boris.unibe.ch/id/eprint/111848

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