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Related Experiment Videos

Geometric Baryogenesis from Shift Symmetry.

Andrea De Simone1, Takeshi Kobayashi1, Stefano Liberati1

  • 1SISSA and INFN Sezione di Trieste, Via Bonomea 265, 34136 Trieste, Italy.

Physical Review Letters
|April 15, 2017
PubMed
Summary
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A new theory proposes Nambu-Goldstone (NG) bosons, like the QCD axion, can generate the Universe's baryon asymmetry. This mechanism links early Universe baryogenesis with potential late-Universe dark matter.

Area of Science:

  • Cosmology
  • Particle Physics
  • Theoretical Physics

Background:

  • The origin of the Universe's baryon asymmetry remains a key unsolved problem in cosmology.
  • Existing models often require complex mechanisms or fine-tuning.
  • Nambu-Goldstone (NG) bosons are theoretical particles predicted by spontaneous symmetry breaking.

Purpose of the Study:

  • To propose a novel scenario for generating baryon asymmetry in the Universe.
  • To explore the role of NG bosons in early Universe cosmology.
  • To investigate potential connections between baryogenesis and dark matter candidates.

Main Methods:

  • Developing a theoretical framework where NG bosons couple to spacetime geometry and baryons.
  • Utilizing shift symmetry to naturally control operators within the theory.

Related Experiment Videos

  • Analyzing the cosmological background's effect on NG boson dynamics.

    • Main Results:

    • A new mechanism for baryogenesis induced by NG boson motion is presented.
    • The QCD axion and axionlike fields are identified as viable candidates for this baryon-generating NG boson.
    • The proposed scenario offers a unified explanation for both early Universe baryogenesis and late-Universe dark matter.

    Conclusions:

    • NG bosons provide a compelling and natural mechanism for generating the observed baryon asymmetry.
    • This framework offers a potential link between fundamental particle physics and cosmological observations.
    • The QCD axion and similar fields are promising candidates for further investigation in both baryogenesis and dark matter research.