Dark Energy Constraints from the Cosmic Age and Supernova

2004/04/30 by Bo Feng, Xiulian Wang, Xinmin Zhang · 4 citations
Physics and Astronomy · #astro-ph #hep-ph #hep-th

paper · pdf · doi:10.1016/j.physletb.2004.12.071

published as Phys.Lett.B607:35-41,2005 · References added; Version to appear in Physics Letters B

arxiv created 2004/12/23 · arxiv updated 2011/05/05

Abstract

Using the low limit of cosmic ages from globular cluster and the white dwarfs: t₀ > 12Gyr, together with recent new high redshift supernova observations from the HST/GOODS program and previous supernova data, we give a considerable estimation of the equation of state for dark energy, with uniform priors as weak as 0.2<Ω_m<0.4 or 0.1<Ω_m h²<0.16. We find cosmic age limit plays a significant role in lowering the upper bound on the variation amplitude of dark energy equation of state. We propose in this paper a new scenario of dark energy dubbed Quintom, which gives rise to the equation of state larger than -1 in the past and less than -1 today, satisfying current observations. In addition we've also considered the implications of recent X-ray gas mass fraction data on dark energy, which favors a negative running of the equation of state.

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