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Related Experiment Videos

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
PubMed
Summary
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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.

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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.