Journal Article

PUBDB-2020-03826

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

Domcke, V. F. (Corresponding author)DESY* ; Guidetti, V. ; Welling, Y.DESY* ; Westphal, A.DESY*

2020
IOP London

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Please use a persistent id in citations: doi:10.1088/1475-7516/2020/09/009  doi:10.3204/PUBDB-2020-03826

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 fholes 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 ; gravitation: collapse ; numerical calculations ; cosmological model

Note: LaTeX, 2+32 pages, 11 figures; appendix C added, version accepted by JCAP

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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:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Domcke, V.DESY* ; Guidetti, V. ; Welling, Y.DESY* ; Westphal, A.DESY*
Resonant backreaction in axion inflation
[10.3204/PUBDB-2020-00857]     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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