长寿命激发态暗物质的CMB和21 cm信号
CMB and 21-cm Signals for Dark Matter with a Long-Lived Excited State
摘要：
激发暗物质（XDM）模型的Finkbeiner和韦纳，假设解释在银河系中心的511千电子伏的信号，我们认为CMB和21厘米的签名模型的暗物质与碰撞长寿的激发态。我们计算的遗迹激发分数从早期宇宙的碰撞退激截面和热去耦的各种假设。对于参数空间的自然区域，残余激发分数可以高达1%，但可以小几个数量级。由于激发态的寿命自然大于10 ^13 s，我们讨论了这种遗迹激发在宇宙微波背景（CMB）和高z 21 cm观测上的特征。这样的模型可能比传统的WIMP湮灭和衰变具有更丰富的天体物理信号，并可能对未来几代实验产生可观察到的后果。
英文摘要：
Motivated by the eXciting Dark Matter (XDM) model of Finkbeiner & Weiner, hypothesized to explain the 511 keV signal in the center of the Milky Way, we consider the CMB and 21-cm signatures of models of dark matter with collisional long-lived excited states. We compute the relic excitation fraction from the early universe for a variety of assumptions about the collisional de-excitation cross-section and thermal decoupling. The relic excitation fraction can be as high as 1% for natural regions of parameter space, but could be orders of magnitude smaller. Since the lifetime of the excited state is naturally greater than 10^13s, we discuss the signatures of such relic excitation on cosmic microwave background (CMB) and high-z 21-cm observations. Such models have potentially richer astrophysical signals than the traditional WIMP annihilations and decays, and may have observable consequences for future generations of experiments.
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。
