http://arxiv.org/abs/2303.17436
We study the non-linear dynamics of axion inflation, capturing for the first time the inhomogeneity and full dynamical range, till the end of inflation. Accounting for inhomogeneous effects during backreaction leads to a number of new relevant results, compared to spatially homogeneous studies: {\it i)} the number of extra efoldings beyond slow roll inflation increases very rapidly with the coupling, {\it ii)} oscillations of the inflaton velocity are attenuated, {\it iii)} the tachyonic gauge field helicity spectrum is smoothed out (i.e.~the spectral oscillatory features disappear), broadened, and shifted to smaller scales, and {\it iv)} the non-tachyonic helicity is excited, reducing the chiral asymmetry, now scale dependent. Our results are expected to impact strongly on the phenomenology and observability of axion inflation, including gravitational wave generation and primordial black hole production.
D. Figueroa, J. Lizarraga, A. Urio, et. al.
Fri, 31 Mar 23
25/70
Comments: 9 pages including Supplemental Material; 4 figures
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