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@ARTICLE{Domcke:435943,
      author       = {Domcke, Valerie and Guidetti, Veronica and Welling, Yvette
                      and Westphal, Alexander},
      title        = {{R}esonant backreaction in axion inflation},
      reportid     = {PUBDB-2020-00857, arXiv:2002.02952. DESY-20-017},
      year         = {2020},
      note         = {LaTeX, 1+28 pages, 10 figures},
      abstract     = {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
                      holes with remarkable phenomenological consequences.},
      keywords     = {inflaton: field equations (autogen) / inflaton: coupling
                      (autogen) / black hole: primordial (autogen) / power
                      spectrum: scalar (autogen) / resonance: enhancement
                      (autogen) / gauge field theory (autogen) / inflation
                      (autogen) / axion (autogen) / Chern-Simons term (autogen) /
                      back reaction (autogen) / nonlinear (autogen) / collapse
                      (autogen) / velocity (autogen)},
      cin          = {T},
      cid          = {I:(DE-H253)T-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF3-611) /
                      STRINGFLATION - Inflation in String Theory - Connecting
                      Quantum Gravity with Observations (647995)},
      pid          = {G:(DE-HGF)POF3-611 / G:(EU-Grant)647995},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2002.02952},
      howpublished = {arXiv:2002.02952},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2002.02952;\%\%$},
      doi          = {10.3204/PUBDB-2020-00857},
      url          = {https://bib-pubdb1.desy.de/record/435943},
}