Artigo de Periódico
Distance-redshift relations in an anisotropic cosmological model
Autor
Menezes Junior, R. S.
Pigozzo, C.
Carneiro, Saulo
Menezes Junior, R. S.
Pigozzo, C.
Carneiro, Saulo
Institución
Resumen
In this paper we study an anisotropic model generated from a particular Bianchi
type-III metric, which is a generalization of G¨odel’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.