Preprint

PUBDB-2020-00857

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Resonant backreaction in axion inflation

Domcke, V.DESY* ; Guidetti, V. ; Welling, Y.DESY* ; Westphal, A.DESY*

2020

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Please use a persistent id in citations: doi:10.3204/PUBDB-2020-00857

Report No.: DESY-20-017; arXiv:2002.02952

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.

Keyword(s): inflaton: field equations ; inflaton: coupling ; black hole: primordial ; power spectrum: scalar ; resonance: enhancement ; gauge field theory ; inflation ; axion ; Chern-Simons term ; back reaction ; nonlinear ; collapse ; velocity

Note: LaTeX, 1+28 pages, 10 figures

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF3-611) (POF3-611)
2. STRINGFLATION - Inflation in String Theory - Connecting Quantum Gravity with Observations (647995) (647995)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2020

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Database coverage:
; Published

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Conference Presentation Welling, Y. M. (Corresponding author)DESY* ; Domcke, V. F.Extern* ; Westphal, A.DESY* ; Guidetti, V.
Resonant backreaction in axion inflation
2020DESY Virtual Theory Forum, DESYHamburg, DESY, Germany, 22 Sep 2020 - 25 Sep 20202020-09-222020-09-25 [10.3204/PUBDB-2020-03544]     Files  Fulltext Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article Domcke, V. F. (Corresponding author)DESY* ; Guidetti, V. ; Welling, Y.DESY* ; Westphal, A.DESY*
Resonant backreaction in axion inflation
2020DESY Virtual Theory Forum, HamburgHamburg, Germany, 22 Sep 2020 - 25 Sep 20202020-09-222020-09-25 Journal of cosmology and astroparticle physics 2009(09), 009 (1-31) (2020) [10.1088/1475-7516/2020/09/009]2020     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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