A1 Journal article (refereed)
Flavour mixing transport theory and resonant leptogenesis (2021)

Jukkala, H., Kainulainen, K., & Rahkila, P. M. (2021). Flavour mixing transport theory and resonant leptogenesis. Journal of High Energy Physics, 2021(9), Article 119. https://doi.org/10.1007/jhep09(2021)119

JYU authors or editors

Publication details

All authors or editors: Jukkala, Henri; Kainulainen, Kimmo; Rahkila, Pyry M.

Journal or series: Journal of High Energy Physics

ISSN: 1126-6708

eISSN: 1029-8479

Publication year: 2021

Volume: 2021

Issue number: 9

Article number: 119

Publisher: Springer

Publication country: Germany

Publication language: English

DOI: https://doi.org/10.1007/jhep09(2021)119

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/77993

Web address of parallel published publication (pre-print): https://arxiv.org/abs/2104.03998


We derive non-equilibrium quantum transport equations for flavour-mixing fermions. We develop the formalism mostly in the context of resonant leptogenesis with two mixing Majorana fermions and one lepton flavour, but our master equations are valid more generally in homogeneous and isotropic systems. We give a hierarchy of quantum kinetic equations, valid at different approximations, that can accommodate helicity and arbitrary mass differences. In the mass-degenerate limit the equations take the familiar form of density matrix equations. We also derive the semiclassical Boltzmann limit of our equations, including the CP-violating source, whose regulator corresponds to the flavour coherence damping rate. Boltzmann equations are accurate and insensitive to the particular form of the regulator in the weakly resonant case ∆m » Γ, but for ∆m ≲ Γ they are qualitatively correct at best, and their accuracy crucially depends on the form of the CP-violating source.

Keywords: particle physics; cosmology

Free keywords: cosmology of theories beyond the SM; CP violation; thermal field theory

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2021

JUFO rating: 2

Last updated on 2022-14-09 at 11:53