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arXiv 2008.09972astro-ph.CO
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用EDGES 21 cm信号探测暗能量和重子与暗物质的散射

Probing Interacting Dark Energy and Scattering of Baryons with Dark Matter in Light of EDGES 21cm Signal

Upala Mukhopadhyay, Debasish Majumdar, Kanan K. Datta

摘要:

EDGES实验观测到中性氢原子(HI)在宇宙黎明期21厘米吸收线($z \simeq 17.2$)亮温$T_{21}$存在一个过剩谷($-500^{+200}_{-500}$ mK)。我们考虑了暗物质和暗能量流体的相互作用以及重子物质与暗物质的碰撞冷却来解释观测到的$T_{21}$过剩谷。我们利用三种不同的暗物质-暗能量(DM-DE)相互作用模型来尝试这些模型在解释EDGES结果中的可行性。哈勃参数的演化被DM-DE相互作用修正,这也是在这项工作中解决的。这反过来又影响HI 21 cm的光学深度以及重子温度,从而影响$T_{21}$的亮度温度。此外,我们还发现,DM-DE相互作用使我们能够探索暗物质与不同的质量制度和他们的生活能力方面,满足EDGES结果。

英文摘要:

The EDGES experiment has observed an excess trough ($-500^{+200}_{-500}$ mK) in the brightness temperature $T_{21}$ of the 21cm absorption line of neutral Hydrogen atom (HI) from the era of cosmic dawn ($z \simeq 17.2$). We consider possible interaction of Dark Matter and Dark Energy fluid along with the cooling off of the baryon matter by its collision with Dark Matter to explain the observed excess trough of $T_{21}$. We make use of three different Dark Matter-Dark Energy (DM-DE) interaction models to taste the viability of those models in explaining the EDGES results. The evolution of Hubble parameter is modified by DM-DE interactions and this is also addressed in this work. This in turn influences the optical depth of HI 21cm as well as the baryon temperature and thus effects the $T_{21}$ brightness temperature. In addition we also find that the DM-DE interaction enables us to explore Dark Matter with varied mass regimes and their viabilities in terms of satisfying the EDGES result.

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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