Null signal for the cosmic anisotropy in the Pantheon supernovae data

作者：Deng, Hua-Kai; Wei, Hao^*

来源：European Physical Journal C, 2018, 78(9): 755.

DOI：10.1140/epjc/s10052-018-6159-4

• FINE-STRUCTURE CONSTANT
• QUASAR POLARIZATION VECTORS
• STRING COSMOLOGICAL MODELS
• BIANCHI TYPE-VIII
• SCALE ALIGNMENTS
• HUBBLE DIAGRAM
• VARYING ALPHA
• IA SUPERNOVAE
• ISOTROPY
• CONSTRAINTS

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 presentwork, 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.

• 出版日期2018-9-20
• 单位北京理工大学