Probing the small-scale matter power spectrum with large-scale 21-cm data
Probing the small-scale matter power spectrum with large-scale 21-cm data
复制标题
用大尺度 21 厘米数据探测小尺度物质功率谱
DOI:
10.1103/physrevd.101.063526
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发表时间:
2020
影响因子:
5
通讯作者:
Cyr-Racine, Francis-Yan
中科院分区:
文献类型:
--
作者:
Muñoz, Julian B.;Dvorkin, Cora;Cyr-Racine, Francis-Yan
The distribution of matter fluctuations in our universe is key for understanding the nature of dark matter and the physics of the early cosmos. Different observables have been able to map this distribution at large scales, corresponding to wave numbers, but smaller scales remain much less constrained. In this work we study the sensitivity of upcoming measurements of the 21-cm line of neutral hydrogen to the small-scale matter power spectrum. The 21-cm line is a promising tracer of early stellar formation, which took place in small haloes (with masses), formed out of matter overdensities with wave numbers as large as. Here we forecast how well both the 21-cm global signal, and its fluctuations, could probe the matter power spectrum during cosmic dawn (). In both cases we find that the long-wavelength modes (with) are highly degenerate with astrophysical parameters, whereas the modes withare more readily observable. This is further illustrated in terms of the principal components of the matter power spectrum, which peak atboth for a typical experiment measuring the 21-cm global signal and its fluctuations. We find that, imposing broad priors on astrophysical parameters, a global-signal experiment can measure the amplitude of the matter power spectrum integrated overwith a precision of tens of percent. A fluctuation experiment, on the other hand, can constrain the power spectrum to a similar accuracy over both theandranges even without astrophysical priors. The constraints outlined in this work would be able to test the behavior of dark matter at the smallest scales yet measured, for instance probing warm-dark matter masses up tofor the global signal and 14 keV for the 21-cm fluctuations. This could shed light on the nature of dark matter beyond the reach of other cosmic probes.
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DOI:
--
发表时间:
2012
期刊:
影响因子:
--
作者:
A. Fialkov;R. Barkana;E. Visbal;Dmitriy Tseliakhovich;C. Hirata
通讯作者:
C. Hirata
DOI:
10.3847/2041-8213/ab1e51
发表时间:
2019
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
A. Schauer;Boyuan Liu;V. Bromm
通讯作者:
V. Bromm
影响因子:
4.8
作者:
B. Greig;A. Mesinger
通讯作者:
B. Greig;A. Mesinger
DOI:
10.1088/0004-637x/736/2/147
发表时间:
2011
期刊:
The Astrophysical Journal
影响因子:
--
作者:
T. Greif;S. White;R. Klessen;V. Springel
通讯作者:
V. Springel
DOI:
10.1073/pnas.1308716112
发表时间:
2013-06
期刊:
Proceedings of the National Academy of Sciences
影响因子:
--
作者:
D. Weinberg;J. Bullock;F. Governato;Rachel Kuzio de Naray;A. Peter
通讯作者:
D. Weinberg;J. Bullock;F. Governato;Rachel Kuzio de Naray;A. Peter