宇宙学初始密度场的迭代重建
An iterative reconstruction of cosmological initial density fields
摘要：
为了提高从重子声学振荡（BAO）中恢复宇宙距离尺度的精度，我们提出了一种从晚期宇宙学物质密度场重建线性理论初始条件的迭代方法.我们目前的测试使用暗物质密度场在真实和红移空间产生的$N$体模拟。在$z = 0.5$的红移空间中，我们发现用我们的迭代方法重建的位移场在$k < 0.10h\ {\rm Mpc}^{-1}$尺度上与暗物质粒子的真实位移场有80%以上的相关.此外，我们表明，我们重建的密度场的两点关联函数匹配的初始密度场大大更好，特别是在小尺度（$< 40h^{-1}\ {\rm Mpc}$）。我们的红移空间的结果得到改善，如果我们使用各向异性平滑，以占减少小尺度信息沿视线在红移空间。
英文摘要：
We present an iterative method to reconstruct the linear-theory initial conditions from the late-time cosmological matter density field, with the intent of improving the recovery of the cosmic distance scale from the baryon acoustic oscillations (BAOs). We present tests using the dark matter density field in both real and redshift space generated from an $N$-body simulation. In redshift space at $z = 0.5$, we find that the reconstructed displacement field using our iterative method are more than 80\% correlated with the true displacement field of the dark matter particles on scales $k < 0.10h\ {\rm Mpc}^{-1}$. Furthermore, we show that the two-point correlation function of our reconstructed density field matches that of the initial density field substantially better, especially on small scales ($< 40h^{-1}\ {\rm Mpc}$). Our redshift-space results are improved if we use an anisotropic smoothing so as to account for the reduced small-scale information along the line of sight in redshift space.
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