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Schröder, Dennis: Low-scale leptogenesis and right-handed electrons. 2020
Inhalt
Introduction
Some shortcomings of the Standard Model
Active neutrino masses
Baryon asymmetry of the Universe
Dark matter
Sterile neutrinos
Lagrangian
Motivation
Right-handed electrons
Effective kinetic equations for out-of-equilibrium processes
General setup
Applicability to early Universe dynamics
Derivation of rate coefficients
Correlators in the effective theory
Correlators in the microscopic theory
Charges and chemical potentials
Kinetic equations for sterile neutrinos
Correlation functions
Kinetic equations
Small Majorana masses & low-scale leptogenesis
Kinetic equations for right-handed electrons
Equilibration rate of right-handed electrons
Higgs decay and multiple soft scattering
Higgs decay
Multiple soft gauge boson scattering
2 to 2 processes
Hard momentum transfer
Soft momentum transfer
Complete 2 to 2 rate
Results
Summary & Outlook
Acknowledgments
Smeared occupancies
Perturbative solution of the equations of motion for fluctuations
Cancellation of the rates gamma fff and gamma ffff
Green's functions at finite temperature and chemical potentials
Correlators of SM fields for sterile neutrinos (symmetric phase)
Dissipative contributions
Dispersive contributions
Conversion of LeR to hypercharge gauge fields
Solving the LPM integral equation for LeR equilibration
Integrals appearing in the 2 to 2 contribution to eR equilibration
One-loop renormalization group equations
The coefficient Gamma at temperatures relevant for mu R or tau R
List of Figures
List of Tables
References