用Fisher矩阵预测检验大尺度结构测量
Testing Large-Scale Structure Measurements Against Fisher Matrix Predictions
摘要：
我们比较重子声学振荡（BAO）和红移空间失真（RSD）测量最近的星系调查与他们的Fisher矩阵为基础的预测。BAO信号的位置的测量导致对共动角直径距离$D_{M}$和哈勃距离$D_{H}$的约束，其与基于Fisher矩阵的期望很好地一致。然而，基于RSD的增长率测量值$f σ_{8}$与调查前的预测值不一致，即使使用实际调查参数重复这些预测值也是如此。我们表明，这是由于一个组合的效果，包括退化的几何参数$D_{M}$和$D_{H}$，和乐观的假设规模，可以提取的线性信号。我们表明，使用当前的数据和大规模建模技术的测量提取等量的信号，在线性政权的$k < 0.08 \,h\,{\rm Mpc}^{-1}$，显着独立的样品的属性和红移覆盖。
英文摘要：
We compare Baryonic Acoustic Oscillation (BAO) and Redshift Space Distortion (RSD) measurements from recent galaxy surveys with their Fisher matrix based predictions. Measurements of the position of the BAO signal lead to constraints on the comoving angular diameter distance $D_{M}$ and the Hubble distance $D_{H}$ that agree well with their Fisher matrix based expectations. However, RSD-based measurements of the growth rate $f σ_{8}$ do not agree with the predictions made before the surveys were undertaken, even when repeating those predictions using the actual survey parameters. We show that this is due to a combination of effects including degeneracies with the geometric parameters $D_{M}$ and $D_{H}$, and optimistic assumptions about the scale to which the linear signal can be extracted. We show that measurements using current data and large-scale modelling techniques extract an equivalent amount of signal to that in the linear regime for $k < 0.08 \,h\,{\rm Mpc}^{-1}$, remarkably independent of the sample properties and redshifts covered.
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