arXiv 1804.010922018-04astro-ph.COastro-ph.IMhep-ph

带电暗物质的21厘米涨落

21-cm Fluctuations from Charged Dark Matter

Julian B. Muñoz, Cora Dvorkin, Abraham Loeb

备注：: 6 pages, 4 figures. Updated to match PRL accepted version
发表信息：: Phys. Rev. Lett. 121, 121301 (2018)
DOI：: 10.1103/PhysRevLett.121.121301

摘要：

第一批恒星形成的时代，被称为宇宙黎明，已经成为寻找暗物质的新舞台。特别是，第一个声称的21厘米探测器表现出比预期更深的全局吸收特征，这可能是由低重子温度引起的，并被解释为重子和暗物质之间电磁相互作用的标志。这个假说有一个惊人的预测：大的温度各向异性来源于重子的速度依赖冷却。然而，为了与宇宙学观测的其余部分保持一致，只允许部分暗物质带电，从而相互作用。在这里，我们计算，为第一次，21厘米的波动所造成的带电的子组件的暗物质，包括前和后的重组演化的所有流体。我们发现，对于可以解释异常21厘米吸收信号的相同参数，任何带电暗物质的π能级部分都将产生具有独特声学频谱的新颖21厘米波动，并且幅度高于任何其他已知效应。这些波动与通常的绝热各向异性无关，并且可以用LOFAR和HERA等干涉仪观察到，从而提供了宇宙黎明时暗物质的新探测。

英文摘要：

The epoch of the formation of the first stars, known as the cosmic dawn, has emerged as a new arena in the search for dark matter. In particular, the first claimed 21-cm detection exhibits a deeper global absorption feature than expected, which could be caused by a low baryonic temperature, and has been interpreted as a sign for electromagnetic interactions between baryons and dark matter. This hypothesis has a striking prediction: large temperature anisotropies sourced by the velocity-dependent cooling of the baryons. However, in order to remain consistent with the rest of cosmological observations, only part of the dark matter is allowed to be charged, and thus interactive. Here we compute, for the first time, the 21-cm fluctuations caused by a charged subcomponent of the dark matter, including both the pre- and post-recombination evolution of all fluids. We find that, for the same parameters that can explain the anomalous 21-cm absorption signal, any percent-level fraction of charged dark matter would source novel 21-cm fluctuations with a unique acoustic spectrum, and with an amplitude above any other known effects. These fluctuations are uncorrelated with the usual adiabatic anisotropies, and would be observable at high significance with interferometers such as LOFAR and HERA, thus providing a novel probe of dark matter at cosmic dawn.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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