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标题：Dark energy constraints from the cosmic age and supernova
来源：《物理快报B》2005年607卷1-2期35-41页
作者：中科院高能物理研究所 Bo Feng（冯波）, Xin-Min Zhang（张新民）
中科院理论物理研究所 Xiu-Lian Wang（王秀莲）
Research Fronts: QUINTOM DARK ENERGY; D3-BRANE DARK ENERGY MODEL; HYBRID DARK ENERGY MODEL; DARK ENERGY EVOLUTION; DARK ENERGY INTERNAL DEGREES
领域：物理
摘要：Using the low limit of cosmic ages from globular cluster and the white dwarfs:  , 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<Ωm<0.4 or 0.1<Ωmh2<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.
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