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Wash-In Leptogenesis
Valerie Domcke1,2, Kohei Kamada3, Kyohei Mukaida1,4
1Theoretical Physics Department, CERN, 1211 Geneva 23, Switzerland.
Physical Review Letters
|June 10, 2021
Summary
Wash-in leptogenesis, a new mechanism in the type-I seesaw model, generates baryon asymmetry without CP violation, even with strong wash-out. It operates at lower right-handed neutrino masses, around a few hundred TeV.
Area of Science:
- Particle Physics
- Cosmology
- Astroparticle Physics
Background:
- Leptogenesis is a leading mechanism for explaining the matter-antimatter asymmetry in the universe.
- Standard leptogenesis models often require CP violation in the neutrino sector and operate at high right-handed neutrino masses.
- The type-I seesaw model provides a framework for generating neutrino masses and offers a basis for leptogenesis.
Purpose of the Study:
- To introduce a novel leptogenesis mechanism, termed wash-in leptogenesis, within the standard type-I seesaw model.
- To demonstrate that this mechanism can operate at lower right-handed neutrino masses (few hundred TeV) and does not require CP violation in the neutrino sector.
- To explore its viability even in the presence of strong wash-out conditions.
Main Methods:
- Generalizing standard freeze-out leptogenesis to a nonminimal cosmological background.
- Allowing arbitrary values for chemical potentials of particles not in chemical equilibrium at leptogenesis temperature.
- Investigating the generation of a non-vanishing B-L asymmetry by reprocessing high-temperature chemical potentials.
Main Results:
- Wash-in leptogenesis successfully operates at right-handed neutrino masses as low as a few hundred TeV.
- The mechanism is effective even in the regime of strong wash-out.
- It does not necessitate CP violation within the neutrino sector.
Conclusions:
- Wash-in leptogenesis provides a viable and potentially simpler alternative for generating the observed baryon asymmetry.
- This framework opens avenues for new baryogenesis models by utilizing chemical potentials generated at high temperatures.
- The mechanism is compatible with cosmological scenarios like axion inflation and grand unification theories.
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