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Postsphaleron baryogenesis.

K S Babu1, R N Mohapatra, S Nasri

  • 1Department of Physics, Oklahoma State University, Stillwater, OK 74078, USA.

Physical Review Letters
|October 10, 2006
PubMed
Summary
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This study introduces a novel mechanism for generating the Universe's baryon asymmetry via singlet scalar field decay, bypassing the need for sphalerons. This new model predicts observable phenomena like colored scalars at the Large Hadron Collider.

Area of Science:

  • Cosmology and Particle Physics
  • High Energy Physics
  • Theoretical Physics

Background:

  • The origin of the Universe's baryon asymmetry remains a significant unsolved problem in cosmology.
  • Current popular models often rely on electroweak sphalerons to generate baryon number.
  • A mechanism independent of sphalerons is needed to explain the observed matter-antimatter imbalance.

Purpose of the Study:

  • To propose and analyze a new mechanism for generating baryon asymmetry.
  • To explore baryon number generation through singlet scalar field decay.
  • To investigate the implications for observable phenomena at colliders and future experiments.

Main Methods:

  • Directly generating baryon asymmetry in the decay of a singlet scalar field S(r).

Related Experiment Videos

  • Utilizing a high-dimensional baryon number-violating coupling and weak scale mass for the scalar field.
  • Analyzing CP asymmetry through loop diagrams involving W+/- gauge bosons, suppressed by light quark masses.

    • Main Results:

    • The mechanism becomes effective after the electroweak phase transition.
    • It naturally yields a baryon asymmetry value of eta(B) approximately 10(-10).
    • The simplest model predicts colored scalars detectable at the CERN Large Hadron Collider.

    Conclusions:

    • This novel mechanism offers a viable alternative for generating baryon asymmetry without sphalerons.
    • The predicted colored scalars and potential for neutron-antineutron oscillation provide testable predictions.
    • This research opens new avenues for exploring the early Universe and fundamental particle physics.