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Leptogenesis from heavy right-handed neutrinos in CPT violating backgrounds
Thomas Bossingham1, Nick E Mavromatos1,2, Sarben Sarkar1
11Theoretical Particle Physics and Cosmology Group, Department of Physics, King's College London, Strand, London, WC2R 2LS UK.
The European Physical Journal. C, Particles and Fields
|July 2, 2019
Summary
This study explores leptogenesis, the generation of lepton asymmetry, in a CPT-violating background. The research found that including thermal momentum modes for heavy neutrinos doubles the lepton asymmetry compared to previous estimates.
Area of Science:
- Particle Physics
- Cosmology
- String Theory
Background:
- Leptogenesis models explain the universe's matter-antimatter asymmetry.
- Previous studies estimated lepton asymmetry with simplified heavy neutrino decay.
- String theory motivates CPT-violating backgrounds in early universe models.
Purpose of the Study:
- To rigorously analyze leptogenesis in a CPT-violating axial time-like background.
- To incorporate thermal momentum modes for heavy neutrinos in Boltzmann equation solutions.
- To refine estimates of lepton asymmetry generation from heavy neutrino decays.
Main Methods:
- Analytical approximation of Boltzmann equations using Padé approximants.
- Modeling heavy right-handed Majorana neutrinos in a CPT-violating background.
- Solving for lepton asymmetry at temperatures above the electroweak phase transition.
Main Results:
- Lepton asymmetry is approximately doubled due to thermal momentum modes.
- The analysis provides a more accurate prediction of lepton asymmetry.
- Results show agreement with preliminary estimates within uncertainty.
Conclusions:
- Thermal momentum modes significantly impact lepton asymmetry generation.
- Padé approximants offer a novel and effective method for solving cosmological Boltzmann equations.
- This work advances our understanding of leptogenesis in non-standard CPT-violating scenarios.
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