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arXiv · 2410.15675

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

Zixuan Xu·Sibo Zheng
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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.

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Zixuan Xu, Sibo Zheng. 2024-10-21. Lyman-$\alpha$ limit on axion-like cold dark matter. https://doi.org/10.1103/physrevd.111.063525

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