New Constraints on the Variable Equation of State Parameter from X-Ray Gas Mass Fractions and SNe Ia

Details New Constraints on the Variable Equation of State Parameter from X-Ray Gas Mass Fractions and SNe Ia New Constraints on the Variable Equation of State Parameter from X-Ray Gas Mass Fractions and SNe Ia

2006-08-31

arxiv.org/abs/astro-ph/0608686v1

Int.J.Mod.Phys.D16:403-409,2007

Astronomy and Astrophysics

Astrophysics

paper, 6 pages, 1 figure Accepted by Int. Journal of Modern Physics D (IJPMD)

Scientific paper

10.1142/S0218271807010183

Recent measurements are suggesting that we live in a flat Universe and that its present accelerating stage is driven by a dark energy component whose equation of state may evolve in time. Assuming two different parameterizations for the function $\omega(z)$, we constrain their free parameters from a joint analysis involving measurements from X-Ray luminosity of galaxy clusters and SNe type Ia data.

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