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arXiv 1102.4726astro-ph.CO
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综合分析SNe Ia、OHD和BAO数据重建暗能量的状态方程和密度参数

Reconstructing the equation of state and density parameter for dark energy from combined analysis of recent SNe Ia, OHD and BAO data

Debabrata Adak, Abhijit Bandyopadhyay, Debasish Majumdar

摘要:

采用模型无关的方法,通过分析5组Ia超新星观测数据,结合重子声学振荡(BAO)和哈勃观测数据(OHD),重建了暗能量状态方程。SNe Ia数据集包括UNION 2的最新数据和2007年至今的其他数据汇编。我们假设一个封闭的形式参数化的光度距离的红移和执行$χ^2$分析的观测数据。物质密度在本时代$Ω_m^0$也被视为是一个参数的分析和它的最佳拟合值获得的每一个数据集。我们发现,暗能量状态方程对当前和早期的物质密度有很强的依赖性。从分析中,我们还预测了在1 $σ$置信水平的平坦FRW宇宙的物质密度参数的下限在较早的时代。暗能量状态方程似乎是$z$的慢变函数。给出了暗能量密度参数和物质密度参数的变化以及它们的1 $σ$变化。

英文摘要:

We adopt a model independent method to reconstruct the dark energy equation of state by analyzing 5 sets of SNe Ia data along with Baryon Acoustic Oscillation (BAO) and Observational Hubble Data (OHD). The SNe Ia data sets include the most recent UNION2 data and other data compilations from the year 2007 to the present. We assume a closed form parametrization of the luminosity distance in terms of redshift and perform a $χ^2$ analysis of the observational data. The matter density at the present epoch $Ω_m^0$ is also taken to be a parameter in the analysis and its best-fit values are obtained for each of the data sets. We found a strong dependence of dark energy equation of state on the matter density in the present and earlier epoch. From the analysis, we also predict the lower limit of matter density parameter at an earlier epoch within 1$σ$ confidence level for a flat FRW universe. The dark energy equation of state appears to be a slow varying function of $z$. The variation of dark energy density parameter and the matter density parameter are also shown along with their 1$σ$ variations.

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