Lyman-$\alpha$ limit on axion-like cold dark matter

Abstract

Using low redshift data on astrophysical reionization, we report new Lyman-$\alpha$ limit on axion-like particle (ALP) as cold dark matter in ALP mass range of $m_a\sim 30-1000$ 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 $m_a\sim 375-425$ eV and complementary in the ALP mass range otherwise. Combing these limits, we show new exclusion limits on $m_a$ for the ALP DM from either misalignment or freeze-in mechanism.

arXiv comment9 pages, 3 figures

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Cited by in corpus (1)

• LHC-friendly freeze-in dark matter via Higgs portal