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arXiv 1908.03732astro-ph.COgr-qchep-ph
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用SKA未来21厘米观测改进宇宙学参数估计

Improving cosmological parameter estimation with the future 21 cm observation from SKA

Jing-Fei Zhang, Li-Yang Gao, Dong-Ze He, Xin Zhang

摘要:

中性氢巡天21 cm辐射的观测将成为探测宇宙大尺度结构的一个很有前途的途径。本文研究了平方公里阵列(SKA)21 cm观测对宇宙学参数估计的影响。我们使用基于未来SKA实验的重子声振荡(BAO)测量的模拟数据,用强度映射(IM)技术进行了分析。对于当前的观测,我们使用{ \it Planck} 2018年最新的宇宙微波背景(CMB)观测,光学BAO测量和Ia型超新星(SN)观测(Pantheon汇编)。我们发现,SKA模拟数据可以打破物质密度与哈勃常数之间的简并关系,进一步在很大程度上改善宇宙学约束。我们还发现,通过将SKA模拟数据纳入宇宙学整体拟合,可以显著改善对暗能量状态方程参数的约束。

英文摘要:

Future observations of 21 cm emission from neutral hydrogen survey will become a promising approach to probe the large scale structure of Universe. In this paper, we investigate the impacts of Square Kilometer Array (SKA) 21 cm observation on the estimation of cosmological parameters. We use the simulated data of the baryonic acoustic oscillation (BAO) measurements based on the future SKA experiment with the intensity mapping (IM) technique to do the analysis. For the current observations, we use the latest cosmic microwave background (CMB) observation from {\it Planck} 2018, the optical BAO measurements, and the Type Ia supernovae (SN) observation (Pantheon compilation). We find that the SKA mock data could break the degeneracy between the matter density and the Hubble constant, further improving the cosmological constraints to a great extent. We also find that the constraint on the equation of state parameters of dark energy could be significantly improved by including the SKA mock data into the cosmological global fit.

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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