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Gravitational baryogenesis.

Hooman Davoudiasl1, Ryuichiro Kitano, Graham D Kribs

  • 1School of Natural Sciences, Institute for Advanced Study, Princeton, New Jersey 08540, USA.

Physical Review Letters
|December 17, 2004
PubMed
Summary
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A novel gravitational interaction dynamically breaks CPT symmetry in an expanding Universe. This, alongside other interactions, explains the observed baryon asymmetry, reconciling cosmology and particle physics.

Area of Science:

  • Cosmology
  • Particle Physics
  • Gravitational Physics

Background:

  • The origin of the Universe's baryon asymmetry remains a key unsolved problem in physics.
  • Understanding the interplay between gravity, matter, and symmetry is crucial for cosmological models.

Purpose of the Study:

  • To investigate a novel mechanism for dynamically breaking CPT symmetry in an expanding Universe.
  • To explore how this symmetry breaking can generate the observed baryon asymmetry.

Main Methods:

  • Analyzing gravitational interactions involving the Ricci scalar curvature and baryon-number current.
  • Incorporating baryon-number-violating interactions within a cosmological framework.

Main Results:

  • Demonstrated that a specific gravitational interaction dynamically breaks CPT symmetry.

Related Experiment Videos

  • Showed this mechanism, combined with other interactions, can lead to an observationally acceptable baryon asymmetry.

    • Conclusions:

    • CPT symmetry breaking via gravitational interactions offers a viable pathway to explain the Universe's matter-antimatter imbalance.
    • This provides a potential link between fundamental symmetries, gravity, and early Universe cosmology.