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

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

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Hauptverfasser:	Cunha, J. V, Marassi, L, Santos, R. C
Format:	Artikel
Sprache:	eng
Schlagworte:	Physics - Astrophysics of Galaxies Physics - Cosmology and Nongalactic Astrophysics Physics - Earth and Planetary Astrophysics Physics - High Energy Astrophysical Phenomena Physics - Instrumentation and Methods for Astrophysics Physics - Solar and Stellar Astrophysics
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Zusammenfassung:	Int.J.Mod.Phys.D16:403-409,2007 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.
DOI:	10.48550/arxiv.astro-ph/0608686