The significance of anisotropic signals hiding in the Type Ia supernovae
Lin, HN; Li, X; Chang Z(常哲); Chang, Z
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2016
卷号460期号:1页码:617
关键词supernovae: general large-scale structure of Universe
DOI10.1093/mnras/stw995
文章类型Article
英文摘要We use two different methods, i.e. dipole-fitting (DF) and hemisphere comparison (HC), to search for the anisotropic signals hiding in the Union2.1 data set. We find that the directions of maximum matter density derived using these two methods are about 114A degrees away from each other. We construct four Union2.1-like mock samples to test the statistical significance of these two methods. It is shown that DF method is statistically significant, while HC method is strongly biased by the distribution of data points in the sky. Then we assume that the anisotropy of distance modulus is mainly induced by the anisotropy of matter density, which is modelled to be the dipole form Omega(M) = Omega(M0)(1 - cos theta). We fit our model to Union2.1, and find that the direction of maximum matter density is well consistent with the direction derived using DF method, but it is very different from the direction previously claimed. Monte Carlo simulations show that our method is statistically more significant than HC method, although it is not as significant as DF method. The statistical significance can be further improved if the data points are homogeneously distributed in the sky. Due to the low quality of present supernovae data, however, it is still premature to claim that the Universe has any preferred direction.
关键词[WOS]FINE-STRUCTURE CONSTANT ; LAMBDA-CDM ; COSMOLOGICAL CONSTRAINTS ; PREFERRED DIRECTION ; HUBBLE DIAGRAM ; UNIVERSE ; EXPANSION ; GALAXIES ; ISOTROPY ; MODEL
语种英语
WOS记录号WOS:000379835200044
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被引频次:5[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/260616
专题中国科学院高能物理研究所_理论物理室_期刊论文
作者单位中国科学院高能物理研究所
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Lin, HN,Li, X,Chang Z,et al. The significance of anisotropic signals hiding in the Type Ia supernovae[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,460(1):617.
APA Lin, HN,Li, X,常哲,&Chang, Z.(2016).The significance of anisotropic signals hiding in the Type Ia supernovae.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,460(1),617.
MLA Lin, HN,et al."The significance of anisotropic signals hiding in the Type Ia supernovae".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 460.1(2016):617.
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