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arXiv 1104.4094hep-phastro-ph.HE
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约束衰变的暗物质

Constraining Decaying Dark Matter

Ran Huo

摘要:

我们重新审视了衰变暗物质(DDM)模型,在该模型中,一个无碰撞粒子早期衰变为两个无碰撞粒子,这两个粒子可能是今天的暗物质粒子。DDM效应将在宇宙微波背景(CMB)和结构形成中表现出来。通过对CMB计算工具\texttt{camb}的系统修改,我们可以数值计算这种效应,并将其与观测结果进行比较。进一步的马尔可夫链蒙特卡罗\texttt{cosmomc}运行更新了该模型中的约束:非相对论性衰变的自由流长度$λ_{FS}\lesssim0.5$ Mpc,相对论性衰变的自由流长度$((M_{DDM}/keV) Y)^2 (T_d/yr)\lesssim5\times10^{-5}$。

英文摘要:

We revisited the decaying dark matter (DDM) model, in which one collisionless particle decays early into two collisionless particles, that are potentially dark matter particles today. The effect of DDM will be manifested in the cosmic microwave background (CMB) and structure formation. With a systematic modification of CMB calculation tool \texttt{camb}, we can numerically calculated this effect, and compare it to observations. Further Markov Chain Monte Carlo \texttt{cosmomc} runnings update the constraints in that model: the free streaming length $λ_{FS}\lesssim0.5$Mpc for nonrelativistic decay, and $((M_{DDM}/keV) Y)^2 (T_d/yr)\lesssim5\times10^{-5}$ for relativistic decay.

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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