High-scale axions without isocurvature from inflationary dynamics

Observable primordial tensor modes in the cosmic microwave background (CMB) would point to a high scale of inflation H sub(I) If the scale of Peccei-Quinn (PQ) breaking [functionof] sub()ais greater than [H sub(I)2[pi]], CMB constraints on isocurvature naively rule out QCD axion dark matter. This as...

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Veröffentlicht in:Physical review. D 2016-05, Vol.93 (9), Article 095026
Hauptverfasser: Kearney, John, Orlofsky, Nicholas, Pierce, Aaron
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Sprache:eng
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Zusammenfassung:Observable primordial tensor modes in the cosmic microwave background (CMB) would point to a high scale of inflation H sub(I) If the scale of Peccei-Quinn (PQ) breaking [functionof] sub()ais greater than [H sub(I)2[pi]], CMB constraints on isocurvature naively rule out QCD axion dark matter. This assumes the potential of the axion is unmodified during inflation. We revisit models where inflationary dynamics modify the axion potential and discuss how isocurvature bounds can be relaxed. We find that models that rely solely on a larger PQ-breaking scale during inflation [functionof] sub()Irequire either late-time dilution of the axion abundance or highly super-Planckian [functionof] sub()Ithat somehow does not dominate the inflationary energy density. Models that have enhanced explicit breaking of the PQ symmetry during inflation may allow [functionof] sub()aclose to the Planck scale. Avoiding disruption of inflationary dynamics provides important limits on the parameter space.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.93.095026