Lyman-α limit on axion-like cold dark matter
Abstract
Using low redshift data on astrophysical reionization, we report new Lyman-α limit on axion-like particle (ALP) as cold dark matter in ALP mass range of ma 30-1000 eV. Compared to the Leo T and soft-X ray bound, this limit is so far the most stringent in the ALP mass range of ma 375-425 eV and complementary in the ALP mass range otherwise. Combing these limits, we show new exclusion limits on ma for the ALP DM from either misalignment or freeze-in mechanism.
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