Matching torsion Lambda - term with observations

Details Matching torsion Lambda - term with observations Matching torsion Lambda - term with observations

2002-09-30

arxiv.org/abs/astro-ph/0209610v1

Int.J.Mod.Phys. D12 (2003) 381-394

Astronomy and Astrophysics

Astrophysics

14 pages, 3 figures, accepted for publication on Int. Journ. Mod. Phys. D

Scientific paper

10.1142/S0218271803003074

Taking into account a torsion field gives rise to a negative pressure contribution in cosmological dynamics and then to an accelerated behaviour of Hubble fluid. The presence of torsion has the same effect of a Lambda - term. We obtain a general exact solution which well fits the data coming from high - redshift supernovae and Sunyaev - Zeldovich/X - ray method for the determination of the cosmological parameters. On the other hand, it is possible to obtain observational constraints on the amount of torsion density. A dust dominated Friedmann behaviour is recovered as soon as torsion effects are not relevant.

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