Isotropy of low redshift type Ia supernovae: A Bayesian analysis

被引：30

作者：

Andrade, U. ^{[1
]}

Bengaly, C. A. P. ^{[2
]}

Alcaniz, J. S. ^{[1
,3
,4
]}

Santos, B. ^{[1
]}

机构：

[1] Observ Nacl, BR-20921400 Rio De Janeiro, RJ, Brazil

[2] Univ Western Cape, Dept Phys & Astron, ZA-7535 Cape Town, South Africa

[3] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

[4] Univ Fed Rio Grande do Norte, Dept Fis, BR-59072970 Natal, RN, Brazil

来源：

PHYSICAL REVIEW D | 2018年 / 97卷 / 08期

关键词：

BULK FLOW; GALAXIES; UNIVERSE; INFERENCE; EFFICIENT; CLUSTERS; SKY;

D O I：

10.1103/PhysRevD.97.083518

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The standard cosmology strongly relies upon the cosmological principle, which consists on the hypotheses of large scale isotropy and homogeneity of the Universe. Testing these assumptions is, therefore, crucial to determining if there are deviations from the standard cosmological paradigm. In this paper, we use the latest type Ia supernova compilations, namely JLA and Union2.1 to test the cosmological isotropy at low redshift ranges (z < 0.1). This is performed through a Bayesian selection analysis, in which we compare the standard, isotropic model, with another one including a dipole correction due to peculiar velocities. The full covariance matrix of SN distance uncertainties are taken into account. We find that the JLA sample favors the standard model, whilst the Union2.1 results are inconclusive, yet the constraints from both compilations are in agreement with previous analyses. We conclude that there is no evidence for a dipole anisotropy from nearby supernova compilations, albeit this test should be greatly improved with the much-improved data sets from upcoming cosmological surveys.

引用

页数：7

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