arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1609.03592hep-phastro-ph.GA
收藏

作为暗物质的隐藏扇区氢：小尺度结构形成预测和超精细相互作用的重要性

Hidden Sector Hydrogen as Dark Matter: Small-scale Structure Formation Predictions and the Importance of Hyperfine Interactions

Kimberly K. Boddy, Manoj Kaplinghat, Anna Kwa, Annika H. G. Peter

备注：
22 pages, 6 figures, 2 tables; v2: published version
发表信息：
Phys. Rev. D 94, 123017 (2016)
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

我们研究原子物理学和天体物理学的影响模型中的暗物质是类似的氢在一个隐蔽的部门。暗物质粒子之间的自相互作用既包括弹性散射，也包括超精细跃迁引起的非弹性过程。通过数值求解耦合的薛定谔方程计算了该系统的自相互作用截面。我们发现，这些自相互作用表现出正确的速度依赖性，以解释低暗物质密度的核心，在小星系，同时符合所有的限制，从星系团的观测。对于一个可行的解决方案，暗氢的质量必须在10- 100 GeV的范围和暗精细结构常数必须大于0.02。正是在这个范围内的参数，我们表明，显着的冷却损失可能会发生由于非弹性激发的超精细状态和随后的衰变，与低质量晕的演化和早期生长的超大质量黑洞的影响。冷却从激发到更高的$n$水平的暗氢和随后的衰变是可能的在集群规模，具有很强的依赖性晕质量。最后，我们表明，最小的晕质量是在$10^{3.5}$ $10^7 M_\odot$参数空间的可行区域的范围内，显着大于弱相互作用的暗物质模型的典型预测。这种宇宙结构形成中的观测量模式是这个模型所独有的，这使得它有可能将隐藏扇区氢作为一个可行的暗物质模型纳入或排除。

英文摘要：

We study the atomic physics and the astrophysical implications of a model in which the dark matter is the analog of hydrogen in a secluded sector. The self interactions between dark matter particles include both elastic scatterings as well as inelastic processes due to a hyperfine transition. The self-interaction cross sections are computed by numerically solving the coupled Schrödinger equations for this system. We show that these self interactions exhibit the right velocity dependence to explain the low dark matter density cores seen in small galaxies while being consistent with all constraints from observations of clusters of galaxies. For a viable solution, the dark hydrogen mass has to be in 10--100 GeV range and the dark fine-structure constant has to be larger than 0.02. Precisely for this range of parameters, we show that significant cooling losses may occur due to inelastic excitations to the hyperfine state and subsequent decays, with implications for the evolution of low-mass halos and the early growth of supermassive black holes. Cooling from excitations to higher $n$ levels of dark hydrogen and subsequent decays is possible at the cluster scale, with a strong dependence on halo mass. Finally, we show that the minimum halo mass is in the range of $10^{3.5}$ to $10^7 M_\odot$ for the viable regions of parameter space, significantly larger than the typical predictions for weakly-interacting dark matter models. This pattern of observables in cosmological structure formation is unique to this model, making it possible to rule in or rule out hidden sector hydrogen as a viable dark matter model.

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。

↑