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arXiv 1503.07690astro-ph.CO
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计数空洞探测暗能量

Counting voids to probe dark energy

Alice Pisani, P. M. Sutter, Nico Hamaus, Esfandiar Alizadeh, Rahul Biswas, Benjamin D. Wandelt, Christopher M. Hirata

摘要:

我们表明,星系红移观测中观察到的空洞数量是暗能量状态方程的敏感函数。当暗能量的状态方程为$w_{CPL}(z)=w_0 +w_a z/(1+z)$形式时,利用Fisher矩阵方法,我们发现了$w_0-w_a$平面上的误差椭圆。我们预测了ESA Euclid卫星和NASA WFIRST任务观察到的空洞数量,同时考虑到调查的最新细节,以准确估计其功率。预测空隙数量的理论模型是基于模拟和分析预测中的丰度之间的匹配。为了考虑模型中的不确定性,我们在计算Fisher矩阵时对其自由参数进行边缘化。从普朗克,HST和超新星调查数据的数据的空隙丰度约束的增加显着收紧$w_0-w_a$参数空间。因此,我们量化的改善,由于使用的空隙的约束,并证明空隙丰度是一个敏感的新探头的暗能量状态方程。

英文摘要:

We show that the number of observed voids in galaxy redshift surveys is a sensitive function of the equation of state of dark energy. Using the Fisher matrix formalism we find the error ellipses in the $w_0-w_a$ plane when the equation of state of dark energy is assumed to be of the form $w_{CPL}(z)=w_0 +w_a z/(1+z)$. We forecast the number of voids to be observed with the ESA Euclid satellite and the NASA WFIRST mission, taking into account updated details of the surveys to reach accurate estimates of their power. The theoretical model for the forecast of the number of voids is based on matches between abundances in simulations and the analytical prediction. To take into account the uncertainties within the model, we marginalize over its free parameters when calculating the Fisher matrices. The addition of the void abundance constraints to the data from Planck, HST and supernova survey data noticeably tighten the $w_0-w_a$ parameter space. We thus quantify the improvement in the constraints due to the use of voids and demonstrate that the void abundance is a sensitive new probe for the dark energy equation of state.

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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