Multi-axion models relax the E/N bound on QCD axion photon coupling and allow subdominant dark matter contribution, but an axion-like particle is typically visible to next-generation experiments.
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Combined CMB datasets moderately tighten the allowed range for the spectral index of axion isocurvature but leave amplitude bounds for fixed indices unchanged.
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How well can the QCD axion hide?
Multi-axion models relax the E/N bound on QCD axion photon coupling and allow subdominant dark matter contribution, but an axion-like particle is typically visible to next-generation experiments.
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CMB Constraints on Pre-Inflationary Axion Dark Matter Isocurvature
Combined CMB datasets moderately tighten the allowed range for the spectral index of axion isocurvature but leave amplitude bounds for fixed indices unchanged.
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