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Klaus, Alexander: Sterile neutrino dark matter from the cosmic QCD epoch. 2021
Inhalt
Abstract
Introduction
Beyond the Standard Model
Some dark matter phenomenology
Galactic rotation curves
The Bullet cluster
The cosmic microwave background
Searching for a suitable particle candidate
WIMPs
Axions
Further challenges
Neutrino masses
Baryon asymmetry
General introduction to sterile neutrinos
Different mass scales solve different problems
Seesaw-mechanism
Leptogenesis
Sterile neutrino dark matter today
Phase space constraints
X-ray constraints
Production in the early Universe
Thermal production via mixing
Mass bounds from structure formation
Resonant production
Upper bounds on lepton asymmetry
Uncertainties from QCD
Non-equilibrium evolution equations
Notation and setup
Equations of motion
Active-neutrino self-energy
Real parts
Imaginary parts
Impact of active-neutrino opacities
Non-resonant production
Setup
Results
Resonant production
Setup
Results
Parameter constraints for resonant production
Lower mixing angle bounds from BBN and CMB
Lower mass bounds from the Lyman- forest
Combined constraints
Enhanced production from self-interacting neutrinos
Contribution to active-neutrino self-energy
Parameter constraints
Numerical results
Parameter values for the relic abundance
Resonance effects and opacity impact
Sterile neutrino parameter space
Summary and conclusions
Emergence of resonances with increasing lepton asymmetries
Opacity calculation
List of Figures
List of Tables
References
Acknowledgements