Reconstruction of general scalar-field dark energy models
Reconstruction of general scalar-field dark energy models
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DOI：
10.1103/physrevd.72.083512
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发表时间：
2005-08
影响因子：
5
通讯作者：
S. Tsujikawa
中科院分区：
文献类型：
--
作者：
S. Tsujikawa
研究了一般拉格朗日密度 $p(\ensuremath{\phi},X)$ 标量场暗能量模型的重建，其中 $X$ 是标量场 $\ensuremath{\phi}$ 的运动学项。我们实现了暗能量和暗物质之间的耦合$Q$，并使用两个可观测量表示重建方程：哈勃参数$H$和物质密度扰动${\ensuremath{\delta}}_{m}$。这使我们能够确定相应的理论拉格朗日量的结构以及来自观测的耦合$Q$。我们将我们的公式应用于拉格朗日的几种形式，并通过使用最近的超新星测量黄金数据集提供重建的具体示例。该分析包括广义幻影凝聚模型，作为跨越宇宙常数边界的方法，即使对于单场情况也是如此。
The reconstruction of scalar-field dark energy models is studied for a general Lagrangian density $p(\ensuremath{\phi},X)$, where $X$ is a kinematic term of a scalar-field $\ensuremath{\phi}$. We implement the coupling $Q$ between dark energy and dark matter and express reconstruction equations using two observables: the Hubble parameter $H$ and the matter density perturbation ${\ensuremath{\delta}}_{m}$. This allows us to determine the structure of corresponding theoretical Lagrangian together with the coupling $Q$ from observations. We apply our formula to several forms of Lagrangian and present concrete examples of reconstruction by using the recent Gold dataset of supernovae measurements. This analysis includes a generalized ghost condensate model as a way to cross a cosmological-constant boundary even for a single-field case.