Model-independent analysis of dark energy: supernova fitting result
Model-independent analysis of dark energy: supernova fitting result
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DOI：
10.1088/0264-9381/22/11/014
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发表时间：
2004-05
影响因子：
3.5
通讯作者：
Y. Gong
中科院分区：
文献类型：
--
作者：
Y. Gong
本文利用超新星数据，通过一些与模型无关的方法来探索暗能量的性质。我们首先将尺度因子 a(t) 和光度距离 dL 泰勒展开到五阶，发现减速参数 q0 < 0。这个结果正好调用了 Robertson-Walker 度量。所以宇宙加速膨胀的结论更为普遍。然后我们讨论文献中使用的几种不同的参数化。我们还提出了两种修改后的参数化。我们发现，从本文使用的所有参数化来看，ωDE0 几乎在 1σ 水平上小于 -1。我们还发现从减速阶段到加速阶段的过渡红移为 zT ∼ 0.3。
This paper uses supernova data to explore the property of dark energy by some model-independent methods. We first Taylor expand the scale factor a(t) and the luminosity distance dL to the fifth order to find that the deceleration parameter q0 < 0. This result just invokes the Robertson–Walker metric. So the conclusion that the universe is expanding with acceleration is more general. Then we discuss several different parametrizations used in the literature. We also propose two modified parametrizations. We find that ωDE0 is less than −1 almost at 1σ level from all the parametrizations used in this paper. We also find that the transition redshift from deceleration phase to acceleration phase is zT ∼ 0.3.