First UVLF-based constraints on model-agnostic isocurvature power spectra for CDM, baryon, neutrino, and dark radiation modes yield consistent 95% credible envelopes over k ~ 0.5-10 Mpc^{-1}.
Axion isocurvature fluctuations with extremely blue spectrum
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abstract
We construct an axion model for generating isocurvature fluctuations with blue spectrum, n_{iso}=2-4, which is suggested by recent analyses of admixture of adiabatic and isocurvature perturbations with independent spectral indices, n_{ad} \ne n_{iso}. The distinctive feature of the model is that the spectrum is blue at large scales while scale invariant at small scales. This is naturally realized by the dynamics of the Peccei-Quinn scalar field.
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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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New Isocurvature Constraints from JWST UV Luminosity Function
First UVLF-based constraints on model-agnostic isocurvature power spectra for CDM, baryon, neutrino, and dark radiation modes yield consistent 95% credible envelopes over k ~ 0.5-10 Mpc^{-1}.
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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.