Dark energy and flatness from observational H(z)+WMAP constraint

Details Dark energy and flatness from observational H(z)+WMAP constraint Dark energy and flatness from observational H(z)+WMAP constraint

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ap%26ss.321...43r&link_type=abstract

Astrophysics and Space Science, Volume 321, Issue 1, pp.43-46

Astronomy and Astrophysics

Astrophysics

Dark Energy, Flatness

Scientific paper

We analyse the dark energy problem using observational H(z) data plus the curvature constraint given by WMAP. After a non-parametric statistical study covering the most probable range of Ω m0 and H 0 from different combination of data, we investigate the possibility of having the dark energy EoS parameter ω x ≠-1. In order to keep strict flatness (1% of deviation from Ω=1), our results point out this is the case for 0.20≲Ω m0≲0.23 and H 0≈67 km/s/Mpc, with ω x ≈-0.55. However, if we admit a 10% deviation from the flatness condition, ω x may have any value in the range [-1.2,-0.5] for 0.20≲Ω m0≲0.35 and 67≲ H 0≲74 km/s/Mpc.

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