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Testing the Isotropy of the Universe with Type Ia Supernovae | | L. Campanelli
; P. Cea
; G.L. Fogli
; A. Marrone
; | | Date: |
27 Dec 2010 | | Abstract: | We analyze the magnitude-redshift data of type Ia supernovae included in the
Union catalogue 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 -0.40 < delta < 0.13 and -0.026 < Sigma_0 < 0.014
(1sigma C.L.). 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. | | Source: | arXiv, 1012.5596 | | Services: | Forum | Review | PDF | Favorites | |
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