Signatures of clumpy dark matter in the global 21 cm background signal
Signatures of clumpy dark matter in the global 21 cm background signal
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DOI：
10.1103/physrevd.82.103508
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发表时间：
2008-08
影响因子：
5
通讯作者：
D. Cumberbatch;M. Lattanzi;J. Silk
中科院分区：
文献类型：
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作者：
D. Cumberbatch;M. Lattanzi;J. Silk
我们研究了超对称中性伴子暗物质以及轻暗物质的自湮灭在多大程度上影响星际氢和氦的加热、电离和莱曼-{α}泵的速率，以及这在21 cm全球背景信号中表现出来的程度。我们充分考虑了暗物质晕和其中的子结构对湮灭率的增强。我们发现，这种结构的影响可以导致显着的变化，在差分亮度温度，{delta}T{sub B}。由于天体物理信号的存在，红移z<25的变化可能无法检测到;然而，在最有利的情况下，相对于没有自湮灭暗物质时的值，在z=30时，{delta}T{sub B}的偏差可能高达{approx_equal}20 mK。因此，我们得出结论，为了排除这些模型，测量全球21厘米信号的实验，如边缘和核心，将需要减少在50 MHz的系统学低于20 mK。
We examine the extent to which the self-annihilation of supersymmetric neutralino dark matter, as well as light dark matter, influences the rate of heating, ionization, and Lyman-{alpha} pumping of interstellar hydrogen and helium and the extent to which this is manifested in the 21 cm global background signal. We fully consider the enhancements to the annihilation rate from dark matter halos and substructures within them. We find that the influence of such structures can result in significant changes in the differential brightness temperature, {delta}T{sub b}. The changes at redshifts z<25 are likely to be undetectable due to the presence of the astrophysical signal; however, in the most favorable cases, deviations in {delta}T{sub b}, relative to its value in the absence of self-annihilating dark matter, of up to {approx_equal}20 mK at z=30 can occur. Thus we conclude that, in order to exclude these models, experiments measuring the global 21 cm signal, such as EDGES and CORE, will need to reduce the systematics at 50 MHz to below 20 mK.