Superhorizon CDM isocurvature fluctuations can generate the missing CMB dipole that reconciles the CMB and galaxy-count dipole mismatch, and a slowly rolling axion radial mode can produce the right spectrum while evading CMB isocurvature limits.
Han, QCD axion dark matter and the cosmic dipole problem , Physical Review D 108 (2023) 015026
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Superhorizon fluctuations and the cosmic dipole problem
Superhorizon CDM isocurvature fluctuations can generate the missing CMB dipole that reconciles the CMB and galaxy-count dipole mismatch, and a slowly rolling axion radial mode can produce the right spectrum while evading CMB isocurvature limits.