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

作者：Ribeiro A L B^*; Schilling A C

来源：Astrophysics and Space Science, 2009, 321(1): 43-46.

DOI：10.1007/s10509-009-9995-8

• Dark energy
• Flatness

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 Omega (m0) and H (0) from different combination of data, we investigate the possibility of having the dark energy EoS parameter omega (x) not equal a'1. In order to keep strict flatness (1% of deviation from Omega=1), our results point out this is the case for 0.20a parts per thousand(2)Omega (m0)a parts per thousand(2)0.23 and H (0)a parts per thousand 67 km/s/Mpc, with omega (x) a parts per thousand a'0.55. However, if we admit a 10% deviation from the flatness condition, omega (x) may have any value in the range [-1.2,-0.5] for 0.20a parts per thousand(2)Omega (m0)a parts per thousand(2)0.35 and 67a parts per thousand(2)H (0)a parts per thousand(2)74 km/s/Mpc.

• 出版日期2009-5