PT Journal
AU Domcke, V
   Ema, Y
   Sandner, S
TI Perturbatively including inhomogeneities in axion inflation
SO Journal of Cosmology and Astroparticle Physics
JI J. Cosmol. Astropart. Phys.
PY 2024
BP 019
EP 24pp
VL 03
IS 3
DI 10.1088/1475-7516/2024/03/019
LA English
DE axions; inflation; particle physics- cosmology connection
AB Axion inflation, i.e. an axion-like inflaton coupled to an Abelian gauge field through a Chern-Simons interaction, comes with a rich and testable phenomenology. This is particularly true in the strong backreaction regime, where the gauge field production heavily impacts the axion dynamics. Lattice simulations have recently demonstrated the importance of accounting for inhomogeneities of the axion field in this regime. We propose a perturbative scheme to account for these inhomogeneities while maintaining high computational efficiency. Our goal is to accurately capture deviations from the homogeneous axion field approximation within the perturbative regime as well as self -consistently determine the onset of the nonperturbative regime.
ER