An iterative reconstruction of cosmological initial density fields
An iterative reconstruction of cosmological initial density fields
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DOI：
10.1093/mnras/sty1203
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发表时间：
2018-04
影响因子：
4.8
通讯作者：
Ryuichiro Hada;D. Eisenstein
中科院分区：
文献类型：
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作者：
Ryuichiro Hada;D. Eisenstein
我们提出了一种迭代的方法来重建线性理论的初始条件，从晚时间的宇宙物质密度场，旨在提高宇宙距离尺度的重子声学振荡（BAO）的恢复。我们目前的测试使用暗物质密度场在真实的和红移空间产生的$N$体模拟。在z = 0.5的红移空间中，我们发现在k < 0.10h Mpc ^{-1}$尺度下，用我们的迭代方法重建的位移场与暗物质粒子的真实位移场的相关性超过80%.此外，我们表明，我们重建的密度场的两点相关函数匹配的初始密度场实质上更好，特别是在小尺度（$<40 h ^{-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，以便占减少小尺度信息沿着在红移空间的视线。
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.