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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Inflationary Axion Isocurvature in the CMB across All Ultralight Masses
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.