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arXiv 1806.02773astro-ph.COgr-qchep-th
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Pantheon超新星数据中的宇宙各向异性信号

Null Signal for the Cosmic Anisotropy in the Pantheon Supernovae Data

Hua-Kai Deng, Hao Wei

摘要:

宇宙学原理假定宇宙在宇宙尺度上是均匀的和各向同性的。在文献中有许多关于宇宙均匀性和宇宙各向同性的研究。事实上,已经有人声称宇宙各向异性的一些观测线索。然而,我们注意到,在文献中考虑的数据的缺乏可能是负责的“发现”宇宙各向异性。所以,它可能会在足够大的样本中消失。最近,由1048颗Ia型超新星(SNIa)组成的万神殿样本已经被释放,这是迄今为止最大的光谱确认的SNIa样本。在目前的工作中,我们测试的宇宙各向异性在万神殿SNIa样品使用三种方法,因此,从不同的方法的结果可以交叉检查。半球比较法(HC)、偶极子拟合法(DF)和HEALPix的结果表明,在Pantheon SNIa样品中没有发现宇宙各向异性的证据。

英文摘要:

The cosmological principle assumes that the universe is homogeneous and isotropic on cosmic scales. There exist many works testing the cosmic homogeneity and/or the cosmic isotropy of the universe in the literature. In fact, some observational hints of the cosmic anisotropy have been claimed. However, we note that the paucity of the data considered in the literature might be responsible for the `found' cosmic anisotropy. So, it might disappear in a large enough sample. Very recently, the Pantheon sample consisting of 1048 type Ia supernovae (SNIa) has been released, which is the largest spectroscopically confirmed SNIa sample to date. In the present work, we test the cosmic anisotropy in the Pantheon SNIa sample by using three methods, and hence the results from different methods can be cross-checked. All the results obtained by using the hemisphere comparison (HC) method, the dipole fitting (DF) method and HEALPix suggest that no evidence for the cosmic anisotropy is found in the Pantheon SNIa sample.

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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