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Related Experiment Video

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Pole Inflation from Broken Noncompact Isometry in Weyl Gravity.

Hyun Min Lee1

  • 1Chung-Ang University, Department of Physics, Seoul 06974, South Korea.

Physical Review Letters
|June 18, 2025
PubMed
Summary

This study reveals the microscopic origin of pole inflation in Weyl gravity, linking scalar fields and symmetries. This model offers compatible inflation predictions and a potential dark matter candidate.

Area of Science:

  • Cosmology
  • Theoretical Physics
  • Quantum Gravity

Background:

  • Inflationary cosmology explains the early universe's homogeneity and flatness.
  • Weyl gravity and scalar fields are key components in theoretical models of cosmic inflation.
  • Understanding the microscopic origins of inflation is crucial for refining cosmological models.

Purpose of the Study:

  • To investigate the microscopic origin of pole inflation within the framework of Weyl gravity.
  • To explore the relationship between noncompact isometry, Weyl symmetry, and scalar field couplings.
  • To apply the developed model to Higgs and Peccei-Quinn (PQ) inflation scenarios.

Main Methods:

  • Utilizing scalar fields with broken noncompact isometry in Weyl gravity.
  • Analyzing the interplay between SO(1,N) isometry and Weyl symmetry in the Jordan frame.

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  • Investigating explicit breaking of SO(1,N) symmetry to achieve pole inflation.

    • Main Results:

    • Pole inflation is realized near the inflaton kinetic term's pole due to broken SO(1,N) symmetry.
    • A one-parameter family of solutions for pole inflation is found for Higgs and PQ models.
    • Predictions are compatible with Planck data, and the Weyl gauge field mass is determined.

    Conclusions:

    • The proposed model provides a viable mechanism for pole inflation consistent with observational data.
    • The Weyl gauge field emerging from reheating is a potential dark matter candidate.
    • Axion isocurvature perturbations can be sufficiently suppressed during Peccei-Quinn pole inflation.