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

Abstract

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.

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

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