Leptonic dark matter annihilation in the evolving universe: constraints and implications
Leptonic dark matter annihilation in the evolving universe: constraints and implications
复制标题
演化宇宙中的轻子暗物质湮灭：限制和影响
DOI：
10.1088/1475-7516/2010/10/023
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发表时间：
2009-12
影响因子：
6.4
通讯作者：
Zhang, Xinmin
中科院分区：
文献类型：
--
作者：
Yuan, Qiang;Yue, Bin;Bi, Xiao-Jun;Chen, Xuelei;Zhang, Xinmin
宇宙电子和正电子过剩被解释为可能的暗物质（DM）湮灭产物。在这项工作中，我们调查的可能影响，这样的DM湮灭的情况下，在宇宙的演化历史。我们首先计算了银河系外γ射线背景（EGRB），它是由DM湮没带电轻子的末态辐射和电子/正电子与宇宙微波背景的逆康普顿散射产生的。DM晕轮廓和最小晕质量，这还没有很好地确定从目前的N体模拟，EGRET和费米望远镜的EGRB数据的约束。然后讨论了轻子DM模型对宇宙演化的影响，如星系际介质的再电离和加热、中性氢21 cm信号和结构形成的抑制等。我们表明，对氢21厘米信号的影响可能会显示出有趣的DM湮灭特征，但对星星形成的影响并不显着。未来对21 cm信号的观测可用于对DM的性质进行新的约束。
The cosmic electron and positron excesses have been explained as possible dark matter (DM) annihilation products. In this work we investigate the possible effects of such a DM annihilation scenario during the evolution history of the Universe. We first calculate the extragalactic γ-ray background (EGRB), which is produced through the final state radiation of DM annihilation to charged leptons and the inverse Compton scattering between electrons/positrons and the cosmic microwave background. The DM halo profile and the minimal halo mass, which are not yet well determined from the current N-body simulations, are constrained by the EGRB data from EGRET and Fermi telescopes. Then we discuss the impact of such leptonic DM models on cosmic evolution, such as the reionization and heating of intergalactic medium, neutral Hydrogen 21 cm signal and suppression of structure formation. We show that the impact on the Hydrogen 21 cm signal might show interesting signatures of DM annihilation, but the influence on star formation is not remarkable. Future observations of the 21 cm signals could be used to place new constraints on the properties of DM.
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