I. K. Rozgacheva, A. A. Borisov, A. A. Agapov. Observational constrains on two cosmological models
Submitted on: Feb 18, 2015, 06:09:54
Natural Sciences / Astronomy / Astrophysics
Description: Recently the model-independent approach to calculating a plot of scale factor a versus lookback time t has been developed by Ringermacher & Mead. In the present paper we compare the dependence obtained in their work with predicted ones given by cosmological model with scalar meson field and by two-component (warm massive fermions + cosmological constant) cosmological model. For these models we fit cosmological parameters and estimate corresponding confidence intervals. It was found that there exist a broad region in the parameter space of two-component model satisfying the observed data. We also estimate the transition redshift of the universe in the noisy a(t)-data using anisotropic Gaussian filter on a - t plane. The estimated value of $z_t=0.72pm0.05$ imposes stronger restrictions on the models' parameters.
The abstract of this article will be published in the February 2015 issue of "Intellectual Archive Bulletin", ISSN 1929-1329.
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Observational constrains on two cosmological models.pdf