正压状态方程对暗能量的约束：评估不同观测的重要性
Constraints on the dark energy with barotropic equation of state: assessing the importance of different observations
摘要：
对于具有正压状态方程的动力学暗能量，我们在不同组合数据集的基础上确定了参数的平均值及其置信区间，以及其他宇宙学参数。所使用的观测数据包括普朗克的CMB温度各向异性数据、E模偏振和透镜效应数据、BICEP 2/Keck阵列的B模偏振数据、SDSS和6dFGS的BAO数据、WiggleZ的星系功率谱数据、CFHTLenS的弱透镜效应数据和JLA汇编的SN Ia数据。我们发现，除了一个平均模型外，其他模型都是幻影，状态方程参数在当前历元的平均值接近$-1$，对暗能量绝热声速的约束很弱。我们研究了CMB偏振数据对暗能量参数估计的影响。我们还讨论了哪种类型的宇宙大尺度结构的数据允许最精确地确定暗能量参数。
英文摘要：
For dynamical dark energy with the barotropic equation of state we determine the mean values of parameters and their confidence ranges together with other cosmological parameters on the basis of different combined datasets. The used observations include Planck data on CMB temperature anisotropy, E-mode polarization and lensing, BICEP2/Keck Array data on B-mode polarization, BAO from SDSS and 6dFGS, power spectrum of galaxies from WiggleZ, weak lensing from CFHTLenS and SN Ia data from the JLA compilation. We find that all but one mean models are phantom, mean values of the equation of state parameter at current epoch are close to $-1$ and constraints on the adiabatic sound speed of dark energy are weak. We investigate the effect of CMB polarization data on the dark energy parameters estimation. We discuss also which type of data on the large scale structure of the Universe allows to determine the dark energy parameters most precisely.
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