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
Abstract
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
