GeV-scale hot sterile neutrino oscillations: a derivation of evolution equations

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

[img]
Preview
Text
10.1007-JHEP05(2017)132.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (746kB) | Preview

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)

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:

27 Oct 2017 15:36

Last Modified:

27 Oct 2017 15:36

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

Actions (login required)

Edit item Edit item
Provide Feedback