Could the 21-cm absorption be explained by the dark matter suggested by 8Be transitions?
Could the 21-cm absorption be explained by the dark matter suggested by 8Be transitions?
复制标题
21 厘米吸收可以用 8Be 跃迁暗示的暗物质来解释吗？
DOI：
10.1140/epjc/s10052-018-6439-z
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发表时间：
2018
影响因子：
4.4
通讯作者：
Liu Chang-Fu
中科院分区：
文献类型：
--
作者：
Jia Lian-Bao;Deng Xian-Jin;Liu Chang-Fu
EDGES 最近观察到强于预期的 21 厘米吸收，Be 跃迁的另一个异常现象将是新相互作用的特征。这两个问题可能彼此相关，例如，赝标量介导的费米子毫荷暗物质 (DM) 和 21 厘米吸收可能是由 MeV 毫荷暗物质 (DM) 和氢之间的光子介导的散射引起的。本文将对此进行探讨。对于质量在 范围内的费米子毫荷 DM，在 DM 冻结期间 p 波湮灭将占主导地位。 s 波湮灭受到 CMB 和 21 厘米吸收的限制。毫电荷 DM 可以逃避直接检测实验的限制。看不见的衰变过程可用于寻找毫电荷DM，未来的高强度源，例如NA62，将完成这项工作。
The stronger than expected 21-cm absorption was observed by EDGES recently, and another anomaly ofBe transitions would be signatures of new interactions. These two issues may be related to each other, e.g., pseudoscalarAmediated fermionic millicharged dark matter (DM) and the 21-cm absorption could be induced by photon mediated scattering between MeV millicharged DM and hydrogen. This will be explored in this paper. For fermionic millicharged DMwith masses in a range of, the p-wave annihilationwould be dominant during DM freeze-out. The s-wave annihilationis tolerant by constraints from CMB and the 21-cm absorption. The millicharged DM can evade constraints from direct detection experiments. The process ofwith the invisible decaycould be employed to search for the millicharged DM, and future high intensitysources, such as NA62, will do the job.