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arXiv 0905.2738astro-ph.CO
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对暗能量状态方程相平面的限制

Constraints on the Phase Plane of the Dark Energy Equation of State

Chien-Wen Chen, Pisin Chen, Je-An Gu

摘要:

文献中已经研究了在w和w '平面中的暗能量模型的分类,其中w是暗能量状态方程,w'是其以哈勃时间为单位的时间导数。我们采用当前的超新星Ia、CMB和BAO数据,调用广泛使用的暗能量状态方程的参数化,得到了w-w '平面上的约束。我们发现,暗能量模型,包括宇宙学常数,幻影,非幻影正压流体,和单调上升滚动的精髓被排除在68.3%的置信水平上,根据目前的观测数据。向下滚动的精髓,包括解冻和冻结模型,是与目前的观察。在95.4%的置信水平下,上述模型仍与数据一致。

英文摘要:

Classification of dark energy models in the plane of w and w', where w is the dark energy equation of state and w' its time-derivative in units of the Hubble time, has been studied in the literature. We take the current SN Ia, CMB and BAO data, invoke a widely used parametrization of the dark energy equation of state, and obtain the constraints on the w -w' plane. We find that dark energy models including the cosmological constant, phantom, non-phantom barotropic fluids, and monotonic up-rolling quintessence are ruled out at the 68.3% confidence level based on the current observational data. Down-rolling quintessence, including the thawing and the freezing models, is consistent with the current observations. All the above-mentioned models are still consistent with the data at the 95.4% confidence level.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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