Ghiglieri, Jacopo; Laine, Mikko Sakari (2017). GeV-scale hot sterile neutrino oscillations: a derivation of evolution equations. Journal of High Energy Physics, 2017(5), p. 132. Springer 10.1007/JHEP05(2017)132
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Starting from operator equations of motion and making arguments based on a separation of time scales, a set of equations is derived which govern the non-equilibrium time evolution of a GeV-scale sterile neutrino density matrix and active lepton number densities at temperatures T ≳ 130GeV. The density matrix possesses generation and helicity indices; we demonstrate how helicity permits for a classification of various sources for leptogenesis. The coefficients parametrizing the equations are determined to leading order in Standard Model couplings, accounting for the LPM resummation of 1 + n ↔ 2 + n scatterings and for all 2 ↔ 2 scatterings. The regime in which sphaleron processes gradually decouple so that baryon plus lepton number becomes a separate non-equilibrium variable is also considered.
Item Type: |
Journal Article (Original Article) |
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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, Laine, Mikko Sakari |
Subjects: |
500 Science > 530 Physics |
ISSN: |
1029-8479 |
Publisher: |
Springer |
Language: |
English |
Submitter: |
Esther Fiechter |
Date Deposited: |
27 Oct 2017 15:36 |
Last Modified: |
05 Dec 2022 15:06 |
Publisher DOI: |
10.1007/JHEP05(2017)132 |
ArXiv ID: |
1703.06087 |
BORIS DOI: |
10.7892/boris.102355 |
URI: |
https://boris.unibe.ch/id/eprint/102355 |
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