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Natural inflation models face challenges with the inflaton

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Area of Science:

  • Cosmology
  • Particle Physics

Background:

  • Natural inflation uses pseudo-Nambu-Goldstone bosons for cosmic inflation.
  • Standard models require a large symmetry breaking scale (f ≫ M(p)), challenging theoretical validity.

Purpose of the Study:

  • To investigate a novel interaction to resolve the scale problem in natural inflation.
  • To enable natural inflation with a smaller symmetry breaking scale (f ≪ M(p)).

Main Methods:

  • Introducing a coupling between the inflaton's kinetic term and the Einstein tensor.
  • Analyzing the impact on gravitational friction during inflation.

Main Results:

  • The new interaction enhances gravitational friction, allowing for f ≪ M(p).
  • The theory remains perturbative throughout inflation.
  • Tree-level shift invariance is preserved.
  • No new degrees of freedom are introduced.

Conclusions:

  • This modification offers a viable pathway for natural inflation.
  • It resolves the scale validity issue without compromising fundamental properties.