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arXiv 2304.09810astro-ph.CO
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温暗物质约束:来自CMB、莱曼-$\alpha$和全球21 cm数据的联合分析

Warm Dark Matter constraints from the joint analysis of CMB, Lyman-$α$, and global 21 cm data

Atrideb Chatterjee, Tirthankar Roy Choudhury

AI总结:

本研究联合CMB、类星体吸收光谱和21 cm全球信号,用MCMC方法同时变化所有参数,首次解决简并问题,排除$m_X<2.8$ keV,预测未来数据可约束$m_X>7.7$ keV并探测$m_X\sim7$ keV的WDM粒子。

摘要:

借助我们先前构建的基于MCMC的参数估计软件包\texttt{CosmoReionMC},我们详细研究了21 cm全球信号与CMB及类星体吸收光谱相关观测相结合时,约束温暗物质(WDM)粒子质量的潜力。我们首次在联合分析中同时变化所有自由参数(WDM粒子质量、宇宙学参数和天体物理参数),以解决暗物质粒子质量$m_X$与宇宙学/天体物理参数之间可能存在的简并这一长期被忽视的问题。根据现有的CMB和类星体吸收光谱数据,我们在95%置信水平下排除了$m_X < 2.8$ keV。包括一个预期由即将投入使用的全球信号仪器在红移范围$z = 25 - 5$观测到的模拟21 cm全球信号,假设真实暗物质模型为通常的冷暗物质,预测的约束更为严格,$m_X > 7.7$ keV。若模拟21 cm信号是针对$m_X = 7$ keV的暗物质粒子构建的,我们的预测表明$\left(m_X / \text{keV}\right)^{-1}$在$[0.1, 0.2]$范围内(95%置信水平)。这意味着未来的21 cm数据应能探测到WDM粒子质量,如果$m_X \sim 7$ keV。

英文摘要:

With the help of our previously built MCMC-based parameter estimation package \texttt{CosmoReionMC}, we investigate in detail the potential of 21 cm global signal, when combined with CMB and observations related to the QSO absorption spectra, to constraint the mass of Warm Dark Matter (WDM) particle. For the first time, we simultaneously vary all the free parameters (mass of WDM particle, cosmological parameters, and astrophysical parameters) in a joint analysis with CMB, observations related to the QSO absorption spectra and 21 cm global signal, to address the long-overlooked issue of the possible degeneracies between the Dark Matter particle mass $m_X$ and cosmological/astrophysical parameters. From the existing CMB and QSO absorption spectra data, we can rule out $m_X < 2.8$ keV at 95\% confidence level. Including a mock 21~cm global signal in the redshift range $z = 25 - 5$ expected to be observed with upcoming instruments designed for global signal, the forecasted constraint is found to be much tighter $m_X > 7.7$ keV, assuming that the true dark matter model is the usual cold dark matter. In case the mock 21 cm signal is constructed for dark matter particles having $m_X = 7$ keV, our forecasts indicate that $\left(m_X / \text{keV}\right)^{-1}$ is in the range $[0.1, 0.2]$ ($95\%$ confidence level). This implies that the future 21 cm data should allow detection of the WDM particle mass if $m_X \sim 7$ keV.

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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