Dark energy constraints from the cosmic age and supernova

By Bo Feng, Xiulian Wang, Xinmin Zhang. 2004

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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 Letter 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 have 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. (C) 2004 Elsevier B.V. All rights reserved.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/837b724d62ff086862abb143f76ecd9835f09021

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Citations in the corpus

Phantom energy traversable wormholes (2005, background): “The evolving dark energy with an equation of state ω crossing −1 during its evolution was dubbed “Quintom” [35, 37, 38], as it is different from the quintessence or phantom fields in the determination of the evolution and fate of the universe.”
The clustering of galaxies in the SDSS‐III Baryon Oscillation Spectroscopic Survey: cosmological implications of the large‐scale two‐point correlation function (2012, methodology): “…proposed by Zhao et al. (2005), it is possible to consider the dark energy perturbations using a two-field model, with one of the fields being quintessence-like and the other one phantom-like (e.g. the quintom model proposed in Feng et al. 2005) without introducing new internal degrees of freedom.”