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This study introduces a hybrid axion model that resolves the quality problem in invisible axion models. The new model, based on SO(10)×U(1)a gauge symmetry, allows axions to be dark matter and offers testable predictions.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Astroparticle Physics

Background:

  • Invisible axion models address the strong CP problem via the Peccei-Quinn (PQ) mechanism.
  • Quantum gravity effects typically violate global symmetries, causing a 'quality problem' and requiring fine-tuning in these models.

Purpose of the Study:

  • To present a novel solution to the quality problem in invisible axion models.
  • To introduce a unified SO(10)×U(1)a gauge model where PQ symmetry emerges accidentally.

Main Methods:

  • Development of a unified SO(10)×U(1)a gauge model with an anomaly-free axial gauge symmetry.
  • Demonstration of PQ symmetry emerging as an accidental symmetry within this framework.

Main Results:

  • The proposed hybrid axion model resolves the quality problem without fine-tuning.
  • It allows for a high PQ breaking scale (7×10^11 GeV), enabling axions to serve as cosmological dark matter.
  • The model interpolates between KSVZ and DFSZ axion models, offering distinct, testable predictions for axion couplings.

Conclusions:

  • The hybrid axion model provides a realistic and predictive framework for particle physics and cosmology.
  • It avoids the domain wall problem and offers unique experimental signatures for axion detection.