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Ultraviolet Sensitivity of Peccei-Quinn Inflation

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arxiv 2305.18524 v3 pith:6AVUWOLI submitted 2023-05-29 hep-ph astro-ph.COhep-th

Davide Dal Cin , Takeshi Kobayashi This is my paper · ORCID
classification hep-phastro-ph.COhep-th
keywords inflationpeccei--quinnfieldproblemscenariostrongamplificationsargue
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abstract

The radial direction of the Peccei--Quinn field can drive cosmic inflation, given a non-minimal coupling to gravity. This scenario has been considered to simultaneously explain inflation, the strong $CP$ problem, and dark matter. We argue that Peccei--Quinn inflation is extremely sensitive to higher-dimensional operators. Further combining with the discussion on the axion quality required for solving the strong $CP$ problem, we examine the validity of this scenario. We also show that after Peccei--Quinn inflation, resonant amplifications of the field fluctuation is inevitably triggered.

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  1. Inflationary Axion Isocurvature in the CMB across All Ultralight Masses

    astro-ph.CO 2026-08 conditional novelty 6.0 of 10

    Accurate axion-isocurvature evolution across the full ultralight mass range converts Planck and BICEP bounds into inflation-scale limits and reveals a small discovery window near m_a ~ 10^-25 eV.

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