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Strong Backreaction Regime in Axion Inflation.

Daniel G Figueroa1, Joanes Lizarraga2,3, Ander Urio2,3

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This study reveals how axion inflation

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Area of Science:

  • Cosmology
  • Particle Physics

Background:

  • Axion inflation is a leading model for the early universe.
  • Previous studies often assumed spatial homogeneity, neglecting crucial dynamical effects.

Purpose of the Study:

  • To investigate the nonlinear dynamics of axion inflation, including inhomogeneity and strong backreaction.
  • To capture the full dynamical range of axion inflation until its end.

Main Methods:

  • Nonlinear dynamics simulations.
  • Analysis of inhomogeneous effects during axion inflation.

Main Results:

  • Inhomogeneity significantly increases e-foldings with coupling.
  • Oscillations in inflaton velocity are attenuated.
  • Tachyonic helicity spectra are smoothed and blue-shifted.
  • Nontachyonic helicity is excited, creating scale-dependent chiral asymmetry.

Conclusions:

  • Inhomogeneous axion inflation yields distinct results from homogeneous models.
  • These findings impact gravitational wave and primordial black hole predictions.