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Single field baryogenesis
K R S Balaji1, Robert H Brandenberger
1Department of Physics, McGill University, Montréal, Quebec, Canada H3A 2T8. balaji@hep.physics.mcgill.ca
Physical Review Letters
|February 9, 2005
Summary
This study introduces a novel Affleck-Dine baryogenesis model where a scalar field generates neutrino mass, creating baryon asymmetry without explicit CP violation through electroweak sphaleron transitions.
Area of Science:
- Particle Physics
- Cosmology
- Baryogenesis
Background:
- The Affleck-Dine mechanism is a leading baryogenesis model.
- Generating baryon asymmetry often requires explicit CP violation.
- Neutrino properties are crucial for understanding the early universe.
Purpose of the Study:
- To propose a new baryogenesis mechanism based on Affleck-Dine.
- To explore baryogenesis without explicit CP violation.
- To investigate the role of neutrinos in generating baryon asymmetry.
Main Methods:
- A modified Affleck-Dine mechanism is proposed.
- A rolling scalar field couples to neutrinos via Yukawa interactions.
- Electroweak sphaleron transitions are utilized to generate baryon number density.
Main Results:
- A Dirac mass term for neutrinos is generated.
- No explicitly CP violating couplings are required in the Lagrangian.
- Scalar field decays produce a non-zero left-handed neutrino density.
- This leads to a net baryon number density.
Conclusions:
- The proposed mechanism offers a viable route to baryogenesis.
- It provides a way to generate baryon asymmetry without explicit CP violation.
- Neutrino interactions play a key role in early universe cosmology.
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