Constraining the anisotropy of the universe from supernovae and gamma-ray bursts

Constraining the anisotropy of the universe from supernovae and gamma-ray bursts
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从超新星和伽马射线爆发中限制宇宙的各向异性

DOI:
10.1142/s0217732314500679
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发表时间:
2014-05
影响因子:
1.4
通讯作者:
Wang Sai
Wang Sai
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Chang Zhe;Li Xin;Lin Hai-Nan;Wang Sai

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最近,提出了一个各向异性宇宙学模型。在弗里德曼·罗伯逊·沃克(FRW)线素中加入了一个任意的一种形式,它在宇宙中选择了一个特权轴。对距离-红移关系进行了修改,使其与方向相关。在本文中,我们使用Union2数据集和59高红移伽马射线暴(C.:411Es)来给出宇宙各向异性的约束。结果表明,各向异性的大小约为D = 0.044 0.018,特权轴在银河系坐标系中指向(to, ho) =(306.1”18.7”,18.2”11.2”)方向。各向异性很小,各向同性宇宙学模型是一个很好的近似。
Recently, an anisotropic cosmological model was proposed. An arbitrary one-form, which picks out a privileged axis in the universe, was added to the Friedmann Robertson Walker (FRW) line element. The distance-redshift relation was modified such that it is direction-dependent. In this paper, we use the Union2 dataset and 59 high-redshift gamma-ray bursts (C.:411Es) to give constraints on the anisotropy of the universe. The results show that the magnitude of anisotropy is about D = 0.044 0.018, and the privileged axis points toward the direction (to, ho) = (306.1" 18.7", 18.2" 11.2') in the galactic coordinate system. The anisotropy is small and the isotropic cosmological model is an excellent approximation.
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