Kinematic Constraints to the Transition Redshift from SNe Ia Union Data

Details Kinematic Constraints to the Transition Redshift from SNe Ia Union Data Kinematic Constraints to the Transition Redshift from SNe Ia Union Data

2008-11-14

arxiv.org/abs/0811.2379v1

Phys.Rev.D79:047301,2009

Astronomy and Astrophysics

Astrophysics

10 pages, 4 figures, 1 table

Scientific paper

10.1103/PhysRevD.79.047301

The kinematic approach to cosmological tests provides a direct evidence to the present accelerating stage of the universe which does not depend on the validity of general relativity, as well as on the matter-energy content of the Universe. In this context, we consider here a linear two-parameter expansion for the decelerating parameter, $q(z)=q_0+q_1z$, where $q_0$ and $q_1$ are arbitrary constants to be constrained by the Union supernovae data. By assuming a flat Universe we find that the best fit to the pair of free parameters is ($q_0,q_1$) = ($-0.73,1.5)$ whereas the transition redshift is $z_t = 0.49^{+0.14}_{-0.07}$ ($1\sigma$) $^{+0.54}_{-0.12}$ ($2\sigma$). This kinematic result is in agreement with some independent analyzes and accommodates more easily many dynamical flat models (like $\Lambda$CDM).

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