Is the Nonhomogeneous Universe an Alternative to Friedman-Robertson-Walker with Λ?

Details Is the Nonhomogeneous Universe an Alternative to Friedman-Robertson-Walker with Λ? Is the Nonhomogeneous Universe an Alternative to Friedman-Robertson-Walker with Λ?

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..342..482s&link_type=abstract

1604-2004: Supernovae as Cosmological Lighthouses, ASP Conference Series, Vol. 342, Proceedings of the conference held 15-19 Jun

Mathematics

Logic

Scientific paper

We examine a class of Stephani cosmological models as a prototype of nonhomogeneous models in which accelerated expansion appears naturally, without postulating dark energy or any modification of Einstain's equations. We demonstrate that Stephani model well fits currently avaliable SN Ia data at the same level of accuracy as the concordance ΛCDM model. The different statistical methods are used to obtain best fit and most probable values of the model parameter in this context. The complementary analysis of the age of the oldest astronomical objects as a method of estimate model parameter is also used to confirm our analysis. We also consider the influence of the value of transition redshift. Our results can suggest the existence of nontrivial relation between nonhomogeneity and acceleration of the Universe.

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