Distance-redshift relations in an anisotropic cosmological model

In this paper we study an anisotropic model generated from a particular Bianchi type-III metric, which is a generalization of Godel's metric and an exact solution of Einstein's field equations. We analyse type Ia supernova data, namely the SDSS sample calibrated with the MLCS2k2 fitter, an...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2013-03, Vol.2013 (3), p.i-13, Article 033
Main Authors: Menezes, R S, Pigozzo, C, Carneiro, S
Format: Article
Language:English
Subjects:
ANISOTROPY
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Calibration
COSMOLOGICAL MODELS
Cosmology
DISTANCE
Einstein equations
EINSTEIN FIELD EQUATIONS
ENERGY SPECTRA
EXACT SOLUTIONS
Mathematical analysis
METRICS
RED SHIFT
SUPERNOVAE
Supernovas
UNIVERSE
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Summary:In this paper we study an anisotropic model generated from a particular Bianchi type-III metric, which is a generalization of Godel's metric and an exact solution of Einstein's field equations. We analyse type Ia supernova data, namely the SDSS sample calibrated with the MLCS2k2 fitter, and we verify in which ranges of distances and redshifts the anisotropy could be observed. We also consider, in a joint analysis, the position of the first peak in the CMB anisotropy spectrum, as well as current observational constraints on the Hubble constant. We conclude that a small anisotropy is permitted by the data, and that more accurate measurements of supernova distances above z = 2 might indicate the existence of such anisotropy in the universe.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2013/03/033