The 21-cm absorption lines from neutral hydrogen at cosmic dawn are proposed as a probe to simultaneously study dark matter particle mass and cosmic heating history. By applying a statistical approach to simulated data this probe is shown to distinguish the effects of dark matter from those of cosmic heating.
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References
Carilli, C. L., Gnedin, N. Y. & Owen, F. H I 21 centimeter absorption beyond the epoch of reionization. Astrophys. J. 577, 22–30 (2002). This paper proposed that the 21-cm forest can be detected against luminous high-redshift radio-loud quasars.
Furlanetto, S. R. & Loeb, A. The 21 centimeter forest: radio absorption spectra as probes of minihalos before reionization. Astrophys. J. 579, 1–9 (2002). This paper reports that the 21-cm forest could be used to probe minihalos and the evolution of the early radiation background before reionization.
Xu, Y., Ferrara, A. & Chen, X. The earliest galaxies seen in 21 cm line absorption. Mon. Not. R. Astron. Soc. 410, 2025–2042 (2011). This paper models the 21-cm absorption signals from minihalos and dwarf galaxies, and demonstrates the sensitivity of the signals to the thermal history of the early Universe.
Shimabukuro, H., Ichiki, K., Inoue, S. & Yokoyama, S. Probing small-scale cosmological fluctuations with the 21 cm forest: effects of neutrino mass, running spectral index, and warm dark matter. Phys. Rev. D. 90, 083003 (2014). This paper shows that the 21-cm forest can be used to constrain the particle mass of WDM and also identifies the degeneracy of the WDM model with the effects of IGM heating.
Thyagarajan, N. Statistical detection of IGM structures during cosmic reionization using absorption of the redshifted 21 cm line by H I against compact background radio sources. Astrophys. J. 899, 16 (2020). This paper presents a 1D power spectrum analysis of the 21-cm forest, and demonstrates the sensitivity of the statistical technique.
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This is a summary of: Shao, Y. et al. The 21-cm forest as a simultaneous probe of dark matter and cosmic heating history. Nat. Astron. https://doi.org/10.1038/s41550-023-02024-7 (2023).
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The 21-cm forest can be used to probe both dark matter and the first galaxies. Nat Astron 7, 1019–1020 (2023). https://doi.org/10.1038/s41550-023-02025-6
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DOI: https://doi.org/10.1038/s41550-023-02025-6
