%0 Journal Article
%A Domcke, Valerie Fiona
%A Guidetti, Veronica
%A Welling, Yvette
%A Westphal, Alexander
%T Resonant backreaction in axion inflation
%J Journal of cosmology and astroparticle physics
%V 2009
%N 09
%@ 1475-7516
%C London
%I IOP
%M PUBDB-2020-03826
%M arXiv:2002.02952
%M DESY-20-017
%P 009 (1-31)
%D 2020
%Z LaTeX, 2+32 pages, 11 figures; appendix C added, version accepted by JCAP
%X Axion inflation entails a coupling of the inflaton field to gauge fields through the Chern-Simons term. This results in a strong gauge field production during inflation, which backreacts on the inflaton equation of motion. Here we show that this strongly non-linear system generically experiences a resonant enhancement of the gauge field production, resulting in oscillatory features in the inflaton velocity as well as in the gauge field spectrum. The gauge fields source a strongly enhanced scalar power spectrum at small scales, exceeding previous estimates. For appropriate parameter choices, the collapse of these over-dense regions can lead to a large population of (light) primordial black fholes with remarkable phenomenological consequences.
%B DESY Virtual Theory Forum
%C 22 Sep 2020 - 25 Sep 2020, Hamburg (Germany)
Y2 22 Sep 2020 - 25 Sep 2020
M2 Hamburg, Germany
%K inflaton: field equations (INSPIRE)
%K inflaton: coupling (INSPIRE)
%K black hole: primordial (INSPIRE)
%K power spectrum: scalar (INSPIRE)
%K resonance: enhancement (INSPIRE)
%K gauge field theory (INSPIRE)
%K inflation (INSPIRE)
%K axion (INSPIRE)
%K Chern-Simons term (INSPIRE)
%K back reaction: nonlinear (INSPIRE)
%K gravitation: collapse (INSPIRE)
%K numerical calculations (INSPIRE)
%K cosmological model (INSPIRE)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000590147500011
%R 10.1088/1475-7516/2020/09/009
%U https://bib-pubdb1.desy.de/record/449501