Dark Energy Constraints from the Cosmic Age and Supernova

Details Dark Energy Constraints from the Cosmic Age and Supernova Dark Energy Constraints from the Cosmic Age and Supernova

2004-04-11

arxiv.org/abs/astro-ph/0404224v3

Phys.Lett.B607:35-41,2005

Astronomy and Astrophysics

Astrophysics

References added; Version to appear in Physics Letters B

Scientific paper

10.1016/j.physletb.2004.12.071

Using the low limit of cosmic ages from globular cluster and the white dwarfs: $t_0 > 12$Gyr, 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 $0.2<\Omega_m<0.4$ or $0.1<\Omega_m h^2<0.16$. 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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