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000449501 1001_ $$0P:(DE-H253)PIP1013967$$aDomcke, Valerie Fiona$$b0$$eCorresponding author
000449501 1112_ $$aDESY Virtual Theory Forum$$cHamburg$$d2020-09-22 - 2020-09-25$$wGermany
000449501 245__ $$aResonant backreaction in axion inflation
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000449501 520__ $$aAxion 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.
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000449501 650_7 $$2INSPIRE$$ainflaton: field equations
000449501 650_7 $$2INSPIRE$$ainflaton: coupling
000449501 650_7 $$2INSPIRE$$ablack hole: primordial
000449501 650_7 $$2INSPIRE$$apower spectrum: scalar
000449501 650_7 $$2INSPIRE$$aresonance: enhancement
000449501 650_7 $$2INSPIRE$$agauge field theory
000449501 650_7 $$2INSPIRE$$ainflation
000449501 650_7 $$2INSPIRE$$aaxion
000449501 650_7 $$2INSPIRE$$aChern-Simons term
000449501 650_7 $$2INSPIRE$$aback reaction: nonlinear
000449501 650_7 $$2INSPIRE$$agravitation: collapse
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000449501 7001_ $$0P:(DE-H253)PIP1087239$$aGuidetti, Veronica$$b1
000449501 7001_ $$0P:(DE-H253)PIP1086156$$aWelling, Yvette$$b2$$udesy
000449501 7001_ $$0P:(DE-H253)PIP1013212$$aWestphal, Alexander$$b3$$udesy
000449501 773__ $$0PERI:(DE-600)2104147-7$$a10.1088/1475-7516/2020/09/009$$gVol. 2009, no. 09, p. 009 - 009$$n09$$p009 (1-31)$$tJournal of cosmology and astroparticle physics$$v2009$$x1475-7516$$y2020
000449501 7870_ $$0PUBDB-2020-00857$$aDomcke, Valerie et.al.$$d2020$$iIsParent$$rarXiv:2002.02952 ; DESY-20-017$$tResonant backreaction in axion inflation
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