Kavli Affiliate: Eiichiro Komatsu
| First 5 Authors: Angelo Caravano, Eiichiro Komatsu, Kaloian D. Lozanov, Jochen Weller,
| Summary:
If gauge fields are coupled to an axion field during inflation, they lead to
unique observational signatures within the reach of next generation
experiments. However, this system often shows strong backreaction effects,
invalidating the standard perturbation theory approach. In this paper, we
present the first nonlinear lattice simulation of inflation driven by an axion
field coupled to an abelian U(1) field. We use it to fully characterize the
statistics of the comoving curvature perturbation $zeta$. We find that
non-Gaussianity of $zeta$ is large in the linear regime, whereas it is
strongly suppressed when the dynamics becomes nonlinear. This relaxes bounds
from overproduction of primordial black holes.
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