Kavli Affiliate: Eiichiro Komatsu
| First 5 Authors: Angelo Caravano, Eiichiro Komatsu, Kaloian D. Lozanov, Jochen Weller,
| Summary:
We present the first nonlinear lattice simulation of an axion field coupled
to a U(1) gauge field during inflation. We use it to fully characterize the
statistics of the primordial curvature perturbation {zeta}. We find high-order
statistics to be essential in describing non-Gaussianity of {zeta} in the
linear regime of the theory. On the contrary, non-Gaussianity is suppressed
when the dynamics becomes nonlinear. This relaxes bounds from overproduction of
primordial black holes, allowing for an observable gravitational waves signal
at pulsar timing array and interferometers scales. Our work establishes lattice
simulations as a crucial tool to study the inflationary epoch and its
predictions.
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