Testing the isotropy of the Universe with type Ia supernovae

L. Campanelli, P. Cea, G. L. Fogli, and A. Marrone
Phys. Rev. D 83, 103503 – Published 2 May 2011

Abstract

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 δ, and the present level of anisotropy of the large-scale geometry of the Universe, the actual shear Σ0, are constrained in the ranges 0.16δ0.12 and 0.012Σ00.012 (1σ C.L.) by Union2 data. Supernova data are then compatible with a standard isotropic universe (δ=Σ0=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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  • Received 17 January 2011

DOI:https://doi.org/10.1103/PhysRevD.83.103503

© 2011 American Physical Society

Authors & Affiliations

L. Campanelli1,*, P. Cea1,2,†, G. L. Fogli1,2,‡, and A. Marrone1,2,§

  • 1Dipartimento di Fisica, Università di Bari, I-70126 Bari, Italy
  • 2INFN- Sezione di Bari, I-70126 Bari, Italy

  • *leonardo.campanelli@ba.infn.it
  • paolo.cea@ba.infn.it
  • gianluigi.fogli@ba.infn.it
  • §antonio.marrone@ba.infn.it

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Issue

Vol. 83, Iss. 10 — 15 May 2011

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