Probing cosmology beyond Λdocumentclass12pt{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} begin{document}$$Lambda $$end{document}CDM using SKA

Ghosh Shamik; Jain Pankaj; Kothari RahulPanwar MohitSingh GurmeetTiwari Prabhakar

首页> 外文期刊>Journal of Astrophysics and Astronomy >Probing cosmology beyond Λdocumentclass12pt{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} begin{document}$$Lambda $$end{document}CDM using SKA

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Probing cosmology beyond Λdocumentclass12pt{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} begin{document}$$Lambda $$end{document}CDM using SKA

机译：探索超越 Λdocumentclass12pt{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} begin{document}$$Lambda $$end{document}CDM 使用 SKA

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Abstract The cosmological principle states that the Universe is statistically homogeneous and isotropic at large distance scales. Currently, there exist many observations which indicate a departure from this principle. It has been shown that many of these observations can be explained by invoking superhorizon cosmological perturbations and may be consistent with the Big Bang paradigm. Remarkably, these modes simultaneously explain the observed Hubble tension, i.e., the discrepancy between the direct and indirect measurements of the Hubble parameter. We propose several tests of the cosmological principle using SKA. In particular, we can reliably extract the signal of dipole anisotropy in the distribution of radio galaxies. The superhorizon perturbations also predict a significant redshift dependence of the dipole signal, which can be well tested by the study of signals of reionization and the dark ages using SKA. We also propose to study the alignment of radio galaxy axes as well as their integrated polarization vectors over distance scales ranging from a few Mpc to Gpc. We discuss data analysis techniques that can reliably extract these signals from data.

机译：摘要宇宙学原理指出，宇宙在大距离尺度上是统计学上均匀的和各向同性的。目前，有许多观察表明偏离了这一原则。已经表明，这些观测结果中的许多可以通过援引超视界宇宙学扰动来解释，并且可能与大爆炸范式一致。值得注意的是，这些模式同时解释了观测到的哈勃张力，即哈勃参数的直接和间接测量之间的差异。我们提出了使用SKA对宇宙学原理的几种测试。特别是，我们可以可靠地提取射电星系分布中的偶极子各向异性信号。超视界扰动还预测了偶极子信号的显著红移依赖性，这可以通过使用SKA研究再电离信号和暗时代来很好地验证。我们还建议研究射电星系轴的排列及其积分偏振矢量在从几Mpc到Gpc的距离尺度上的排列。我们讨论了能够可靠地从数据中提取这些信号的数据分析技术。

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来源
《Journal of Astrophysics and Astronomy》 |2023年第1期|共5页
作者
Ghosh Shamik; Jain Pankaj; Kothari RahulPanwar MohitSingh GurmeetTiwari Prabhakar;
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作者单位

Indian Institute of Technology;

University of Science and Technology of China, Chinese Academy of Sciences;

University of the Western CapeChinese Academy of Science;

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原文格式 PDF
正文语种英语
中图分类天文学;
关键词
Cosmological principle; superhorizon perturbations; square kilometre array;

机译：宇宙学原理;超视界扰动;平方公里阵列;

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