宇宙学衰变谱能帮助我们理解湮灭的暗物质吗？
Could the Cosmological Recombination Spectrum Help Us Understand Annihilating Dark Matter?
摘要：
在本文中，我们探讨了DM湮灭对宇宙学复合谱的潜在影响。通过这个例子，我们想证明宇宙学复合谱原则上对复合过程中可能释放的额外能量的细节是敏感的。我们限制自己DM模型产生一个可以忽略不计的原始扭曲的CMB能谱。然而，由于在宇宙复合时期，大部分的能量可以直接进入电离和中性原子的激发，宇宙复合谱和电离历史仍然会受到显着的影响。我们计算修改宇宙学的重组光谱使用我们的多级HI和HeI重组代码，显示额外的光子创建由于DM湮灭引起的跃迁的未补偿回路。正如我们在这里所示，结果取决于详细的分支到加热，电离和激发的沉积能量。在测量宇宙复合谱时，这种依赖性原则上应该使我们能够揭示潜在的湮灭DM模型（或者更一般地说，导致能量注入的机制）的性质。然而，对于目前的上限的潜在DM湮灭率在复合的宇宙学复合谱的影响只在百分之几的水平。尽管如此，我们在这里认为，宇宙复合谱将提供另一个独立的和非常直接的方法来检查在高红移的额外电离或激发光子的来源的存在。这将打开一个新的窗口，可能（非标准）的过程发生（删节）
英文摘要：
In this paper we explore the potential effects of DM annihilations on the cosmological recombination spectrum. With this example we want to demonstrate that the cosmological recombination spectrum in principle is sensitive to details related to possible extra energy release during recombination. We restrict ourselves to DM models which produce a negligible primordial distortion of the CMB energy spectrum. However, since during the epoch of cosmological recombination a large fraction of the deposited energy can directly go into ionizations and excitations of neutral atoms, both the cosmological recombination spectrum and ionization history can still be affected significantly. We compute the modifications to the cosmological recombination spectrum using our multi-level HI and HeI recombination code, showing that additional photons are created due to uncompensated loops of transitions which are induced by DM annihilations. As we illustrate here, the results depend on the detailed branching of the deposited energy into heating, ionizations and excitations. This dependence in principle should allow us to shed light on the nature of the underlying annihilating DM model (or more generally speaking, the mechanism leading to energy injection) when measuring the cosmological recombination spectrum. However, for current upper limits on the potential DM annihilation rate during recombination the cosmological recombination spectrum is only affected at the level of a few percent. Nevertheless, we argue here that the cosmological recombination spectrum would provide another independent and very direct way of checking for the presence of sources of extra ionizing or exciting photons at high redshifts. This would open an new window to possible (non-standard) processes occurring (abridged)
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