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arXiv 1407.0245astro-ph.CO
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星系巡天中的最佳观测量

Optimal observables in galaxy surveys

Julien Carron, István Szapudi

摘要:

利用宇宙学扰动理论计算了暗物质密度场一点概率密度函数的充分统计量,并对Millennium模拟密度场进行了检验.作为幂变换族的一种特殊情况,当谱指数接近$-1$时,对数变换被恢复。然后,我们将讨论这些变换应如何修改的情况下,噪声示踪剂的领域,并专注于泊松采样的情况下。这给了我们最佳的局部变换,以应用于星系调查数据之前提取的频谱,以最有效地捕捉编码在大尺度结构的信息。

英文摘要:

The sufficient statistics of the one-point probability density function of the dark matter density field is worked out using cosmological perturbation theory and tested to the Millennium simulation density field. The logarithmic transformation is recovered for spectral index close to $-1$ as a special case of the family of power transformations. We then discuss how these transforms should be modified in the case of noisy tracers of the field and focus on the case of Poisson sampling. This gives us optimal local transformations to apply to galaxy survey data prior the extraction of the spectrum in order to capture most efficiently the information encoded in large scale structures.

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