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arXiv 1507.00469astro-ph.CO
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由于暗物质粒子衰变引起的重子光子比的变化

Variation of the baryon-to-photon ratio due to decay of dark matter particles

E. O. Zavarygin, A. V. Ivanchik

摘要:

研究了不同宇宙学时期暗物质粒子衰变对重子光子比的影响。我们考虑了暗物质粒子的不同参数值,如质量,寿命,暗物质粒子的相对分数。结果表明,对于质量为10 GeV $÷$ 1 TeV的粒子,暗物质密度$Ω_{\rm CDM}=0.26$的现代值足以导致重子光子比的变化达到$Δη/ η\sim 0.01 ÷1$.然而,这种过程也可能伴随着过量伽马射线通量的出现。利用弥散γ射线背景的观测数据对暗物质衰变模型和重子光子比$Δη/η\lesssim10^{-5}$的最大可能变化进行了约束。在未来的宇宙学实验中探测到这种重子密度的变化,可以作为研究暗物质粒子性质的有力手段。

英文摘要:

The influence of dark matter particle decay on the baryon-to-photon ratio has been studied for different cosmological epochs. We consider different parameter values of dark matter particles such as mass, lifetime, the relative fraction of dark matter particles. It is shown that the modern value of the dark matter density $Ω_{\rm CDM}=0.26$ is enough to lead to variation of the baryon-to-photon ratio up to $Δη/ η\sim 0.01 ÷1$ for decays of the particles with masses 10 GeV $÷$ 1 TeV. However, such processes can also be accompanied by emergence of an excessive gamma ray flux. The observational data on the diffuse gamma ray background are used to making constraints on the dark matter decay models and on the maximum possible variation of the baryon-to-photon ratio $Δη/η\lesssim10^{-5}$. Detection of such variation of the baryon density in future cosmological experiments can serve as a powerful means of studying properties of dark matter particles.

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