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Axiogenesis.

Raymond T Co1, Keisuke Harigaya2

  • 1Leinweber Center for Theoretical Physics, University of Michigan, Ann Arbor, Michigan 48109, USA.

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Summary
This summary is machine-generated.

We propose axiogenesis, a novel mechanism generating the universe's baryon asymmetry from rotating QCD axions. This process connects early universe physics with observable phenomena at colliders and dark matter searches.

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Area of Science:

  • Cosmology
  • Particle Physics
  • Astroparticle Physics

Background:

  • The observed dominance of baryons over antibaryons in the universe (baryon asymmetry) is a fundamental cosmological puzzle.
  • The QCD axion is a hypothetical particle proposed to solve the strong CP problem, with potential implications for dark matter.

Purpose of the Study:

  • To propose and explore a novel mechanism, axiogenesis, for generating the baryon asymmetry.
  • To investigate the potential connection between QCD axion dynamics and the generation of matter-antimatter asymmetry.
  • To explore the phenomenological consequences of this mechanism for particle physics and cosmology.

Main Methods:

  • Proposing a mechanism where the rotation of the QCD axion generates baryon asymmetry.
  • Considering explicit breaking of Peccei-Quinn (PQ) symmetry in the early universe, inducing scalar field rotation.
  • Utilizing QCD and electroweak sphaleron transitions to convert PQ charge asymmetry into baryon asymmetry.

Main Results:

  • A mechanism (axiogenesis) is proposed to explain the cosmological baryon asymmetry through QCD axion rotation.
  • The model predicts a small axion decay constant, offering testable predictions.
  • Connections are established with new physics at the Large Hadron Collider (LHC) and future colliders, as well as axion dark matter.

Conclusions:

  • Axiogenesis provides a compelling framework linking early universe symmetry breaking to the observed baryon asymmetry.
  • The proposed model has testable implications for high-energy particle colliders and dark matter detection.
  • This work opens new avenues for exploring the interplay between axions, baryogenesis, and fundamental physics.