Testing the Isotropy of the Universe with Type Ia Supernovae

Details Testing the Isotropy of the Universe with Type Ia Supernovae Testing the Isotropy of the Universe with Type Ia Supernovae

2010-12-27

arxiv.org/abs/1012.5596v2

Phys.Rev.D83:103503,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

12 pages, 7 figures, 2 tables. Union2 analysis added. New references added. To appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.83.103503

We analyze the magnitude-redshift data of type Ia supernovae included in the Union and Union2 compilations in the framework of an anisotropic Bianchi type I cosmological model and in the presence of a dark energy fluid with anisotropic equation of state. We find that the amount of deviation from isotropy of the equation of state of dark energy, the skewness \delta, and the present level of anisotropy of the large-scale geometry of the Universe, the actual shear \Sigma_0, are constrained in the ranges -0.16 < \delta < 0.12 and -0.012 < \Sigma_0 < 0.012 (1\sigma C.L.) by Union2 data. Supernova data are then compatible with a standard isotropic universe (\delta = \Sigma_0 = 0), but a large level of anisotropy, both in the geometry of the Universe and in the equation of state of dark energy, is allowed.

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