Acceleration in Friedmann cosmology with torsion

Autor: S. H. Pereira, R. de C. Lima, J. F. Jesus, R. F. L. Holanda
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: European Physical Journal C: Particles and Fields, Vol 79, Iss 11, Pp 1-9 (2019)
Druh dokumentu: article
ISSN: 1434-6044
1434-6052
DOI: 10.1140/epjc/s10052-019-7462-4
Popis: Abstract A Friedmann like cosmological model in Einstein–Cartan framework is studied when the torsion function is assumed to be proportional to a single $$\phi (t)$$ ϕ(t) function coming just from the spin vector contribution of ordinary matter. By analysing four different types of torsion function written in terms of one, two and three free parameters, we found that a model with $$\phi (t)=- \alpha H(t) \big ({\rho _{m}(t)}/{\rho _{0c}}\big )^n$$ ϕ(t)=-αH(t)(ρm(t)/ρ0c)n is totally compatible with recent cosmological data, where $$\alpha $$ α and n are free parameters to be constrained from observations, $$\rho _m$$ ρm is the matter energy density and $$\rho _{0c}$$ ρ0c the critical density. The recent accelerated phase of expansion of the universe is correctly reproduced by the contribution coming from torsion function, with a deceleration parameter indicating a transition redshift of about 0.65.
Databáze: Directory of Open Access Journals
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