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arXiv 1602.07282astro-ph.COhep-ph
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来自暗物质湮灭的各向同性河外通量:来自相互作用暗物质情景的教训

Isotropic extragalactic flux from dark matter annihilations: lessons from interacting dark matter scenarios

Ángeles Moliné, Jascha A. Schewtschenko, Sergio Palomares-Ruiz, Celine Boehm, Carlton M. Baugh

摘要:

河外伽马射线和中微子的发射可能有来自暗物质(DM)湮灭的贡献。在观测结果与标准预测之间存在差异的情况下,人们可以通过研究能谱的形状来推断DM对湮灭成宇宙射线的截面。到目前为止,对河外DM信号的所有分析都假设标准宇宙学模型(Lambda CDM)为基础理论。然而,也有替代的DM方案,其中低质量物体的数量被显着抑制。因此,这些模型中的伽马射线和中微子发射的特性可能与LambdaCDM不同。在这里,我们表明,在这些替代模型中的河外各向同性信号具有类似的能量依赖,在LambdaCDM,但整体归一化减少。能谱之间的相似性与通量抑制相结合,可能会导致人们误解LambdaCDM以外的模型的可能证据,因为CDM粒子的湮灭截面比预期的要弱得多。

英文摘要:

The extragalactic gamma-ray and neutrino emission may have a contribution from dark matter (DM) annihilations. In the case of discrepancies between observations and standard predictions, one could infer the DM pair annihilation cross section into cosmic rays by studying the shape of the energy spectrum. So far all analyses of the extragalactic DM signal have assumed the standard cosmological model (LambdaCDM) as the underlying theory. However, there are alternative DM scenarios where the number of low-mass objects is significantly suppressed. Therefore the characteristics of the gamma-ray and neutrino emission in these models may differ from LambdaCDM as a result. Here we show that the extragalactic isotropic signal in these alternative models has a similar energy dependence to that in LambdaCDM, but the overall normalisation is reduced. The similarities between the energy spectra combined with the flux suppression could lead one to misinterpret possible evidence for models beyond LambdaCDM as being due to CDM particles annihilating with a much weaker cross section than expected.

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