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Updated: May 21, 2025
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Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
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Leptogenesis with perturbations in type-II and type-III seesaw models
1Laboratoire de Physique de l'École Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université Paris Cité, 75005 Paris, France.
The European Physical Journal. C, Particles and Fields
|May 19, 2025
Summary
Acoustically driven freeze-out enhances heavy particle yields, boosting baryon asymmetry in type-II and type-III leptogenesis models. This novel effect improves particle yield predictions in early universe cosmology.
Area of Science:
- Particle Physics
- Cosmology
- Astroparticle Physics
Background:
- Standard leptogenesis models explain the matter-antimatter asymmetry.
- Density perturbations can influence particle freeze-out dynamics.
- Previous work identified "acoustically driven freeze-out" enhancing yields in standard leptogenesis.
Purpose of the Study:
- Extend acoustically driven freeze-out calculations to type-I, type-II, and type-III leptogenesis.
- Investigate the impact of washout processes and Sommerfeld-enhanced gauge annihilations.
- Analyze the resulting baryon asymmetry in different leptogenesis scenarios.
Main Methods:
- Theoretical calculations incorporating density perturbations.
- Inclusion of washout in type-I leptogenesis.
- Modeling of Sommerfeld-enhanced gauge annihilations in type-II and type-III leptogenesis.
Main Results:
- Acoustically driven freeze-out enhances heavy particle yields.
- gauge annihilations suppress yields in type-II and type-III leptogenesis.
- Novel enhancements in baryon asymmetry are observed in type-II and type-III leptogenesis, even in the weak washout regime.
Conclusions:
- Acoustically driven freeze-out provides a significant mechanism for generating baryon asymmetry.
- This effect offers a novel route to enhanced baryon asymmetry in type-II and type-III leptogenesis.
- The findings contrast with type-I leptogenesis, highlighting model-dependent impacts of density perturbations.
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