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arXiv 0812.4016hep-phastro-ph
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衰变暗物质的宇宙学约束

Cosmological Constraints on Decaying Dark Matter

Santiago De Lope Amigo, William Man-Yin Cheung, Zhiqi Huang, Siew-Phang Ng

摘要:

我们提出了一个完整的分析宇宙学的约束条件衰减暗物质。以前的分析使用了宇宙微波背景和Ia型超新星。我们用最新的数据更新了它们,并扩展了分析,包括莱曼- $α$森林,大尺度结构和弱透镜观测。本文不考虑天体物理学约束。衰减暗物质寿命的界限主要由后期集成的萨克斯-沃尔夫效应的情况下,弱再电离,或CMB偏振观测时,有显着的再电离。对于各自的情况下,衰变的暗物质的寿命是$Γ^{-1} \gtrsim 100$ Gyr和$ (f Γ) ^{-1} \gtrsim 5.3 \times 10^8$ Gyr(在95.4%的置信水平),其中的唯象参数$f$是衰变能量沉积在重子气体的分数。这使我们能够约束粒子物理模型与暗物质候选人通过调查的暗物质衰变到标准模型粒子通过有效的运营商。对于$\sim 100$ GeV质量的衰变暗物质,我们发现负责暗物质衰变的有效维度-4算子中的耦合常数的大小一般为$ \lesssim 10^{-22}$。我们还探讨了我们的分析的规范介导的超对称性破缺,最小超引力和小希格斯理论的代表性模型的影响。

英文摘要:

We present a complete analysis of the cosmological constraints on decaying dark matter. Previous analyses have used the cosmic microwave background and Type Ia supernova. We have updated them with the latest data as well as extended the analysis with the inclusion of Lyman-$α$ forest, large scale structure and weak lensing observations. Astrophysical constraints are not considered in the present paper. The bounds on the lifetime of decaying dark matter are dominated by either the late-time integrated Sachs-Wolfe effect for the scenario with weak reionization, or CMB polarization observations when there is significant reionization. For the respective scenarios, the lifetimes for decaying dark matter are $Γ^{-1} \gtrsim 100$ Gyr and $ (f Γ) ^{-1} \gtrsim 5.3 \times 10^8$ Gyr (at 95.4% confidence level), where the phenomenological parameter $f$ is the fraction of the decay energy deposited in baryonic gas. This allows us to constrain particle physics models with dark matter candidates through investigation of dark matter decays into Standard Model particles via effective operators. For decaying dark matter of $\sim 100$ GeV mass, we found that the size of the coupling constant in the effective dimension-4 operators responsible for dark matter decay has to generically be $ \lesssim 10^{-22}$. We have also explored the implications of our analysis for representative models in theories of gauge-mediated supersymmetry breaking, minimal supergravity and little Higgs.

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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