Fuzzy Dark Matter and the 21 cm Power Spectrum

被引：32
作者：
Jones, Dana [1 ]
Palatnick, Skyler [1 ]
Chen, Richard [1 ]
Beane, Angus [2 ]
Lidz, Adam [1 ]
机构：
[1] Univ Penn, Dept Phys & Astron, 209 South 33rd St, Philadelphia, PA 19104 USA
[2] Harvard & Smithsonian, Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
来源：
ASTROPHYSICAL JOURNAL | 2021年 / 913卷 / 01期
关键词：
STAR-FORMATION; INTERGALACTIC MEDIUM; HII-REGIONS; REDSHIFT; REIONIZATION; GALAXIES; EPOCH; BAND; CONSTRAINTS; SIGNATURE;
D O I：
10.3847/1538-4357/abf0a9
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We model the 21 cm power spectrum across the Cosmic Dawn and the Epoch of Reionization (EoR) in fuzzy dark matter (FDM) cosmologies. The suppression of low-mass halos in FDM models leads to a delay in the onset redshift of these epochs relative to cold dark matter (CDM) scenarios. This strongly impacts the 21 cm power spectrum and its redshift evolution. The 21 cm power spectrum at a given stage-i.e., compared at fixed average brightness temperature but varying redshift-of the EoR/Cosmic Dawn process is also modified: in general, the amplitude of 21 cm fluctuations is boosted by the enhanced bias factor of galaxy-hosting halos in FDM. We forecast the prospects for discriminating between CDM and FDM with upcoming power spectrum measurements from HERA, accounting for degeneracies between astrophysical parameters and dark matter properties. If FDM constitutes the entirety of the dark matter and the FDM particle mass is 10(-21) eV, HERA can determine the mass to within 20% at 2 sigma confidence.
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页数：15
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