Statefinder diagnostic in a torsion cosmology

Autor:	Ping Xi, Chang-bo Sun, Xin-Zhou Li
Rok vydání:	2009
Předmět:	Physics Theoretical physics Scalar (mathematics) FOS: Physical sciences Astronomy and Astrophysics Model parameters General Relativity and Quantum Cosmology (gr-qc) General Relativity and Quantum Cosmology Cosmology
Zdroj:	Journal of Cosmology and Astroparticle Physics. 2009:015-015
ISSN:	1475-7516
DOI:	10.1088/1475-7516/2009/04/015
Popis:	We apply the statefinder diagnostic to the torsion cosmology, in which an accounting for the accelerated universe is considered in term of a Riemann-Cartan geometry: dynamic scalar torsion. We find that there are some typical characteristic of the evolution of statefinder parameters for the torsion cosmology that can be distinguished from the other cosmological models. Furthermore, we also show that statefinder diagnostic has a direct bearing on the critical points. The statefinder diagnostic divides the torsion parameter $a_1$ into differential ranges, which is in keeping with the requirement of dynamical analysis. In addition, we fit the scalar torsion model to ESSENCE supernovae data and give the best fit values of the model parameters. 18 pages, 15 figures, accepted paper in JCAP
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::114c9f20d06e65f32fcfd56c4707745e https://doi.org/10.1088/1475-7516/2009/04/015 Zobrazit plný text záznamu