CMB lensing beyond the power spectrum: Cosmological constraints from the one-point probability distribution function and peak counts
CMB lensing beyond the power spectrum: Cosmological constraints from the one-point probability distribution function and peak counts
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超越功率谱的 CMB 透镜效应：来自单点概率分布函数和峰值计数的宇宙学约束
DOI：
10.1103/physrevd.94.103501
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发表时间：
2016
影响因子：
5
通讯作者：
Haiman, Zoltán
中科院分区：
文献类型：
--
作者：
Liu, Jia;Hill, J. Colin;Sherwin, Blake D.;Petri, Andrea;Böhm, Vanessa;Haiman, Zoltán
目前正在进行的和不久的将来进行的宇宙微波背景辐射第三和第四阶段调查预计将获得前所未有的精确宇宙微波背景辐射数据，这些调查将产生有效分辨率接近几角分的重构宇宙微波背景辐射透镜图。小尺度的CMB透镜涨落在晚期密度场的非线性结构中有不可忽略的贡献。传统的两点统计（如功率谱）并不能完全表征这些波动。在这里，我们使用体射线跟踪模拟CMB透镜映射检查两个高阶统计：透镜收敛一点概率分布函数（PDF）和峰值计数。我们发现，这些统计数据包含了两点函数没有捕获的重要信息，并为正在进行的第三阶段先进阿塔卡马宇宙学望远镜（AdvACT）实验提供了具体的预测。仅考虑基于温度的重建估计，我们预测（PDF）和（峰值）检测这些统计与AdvACT。我们的仿真流水线充分考虑了透镜重构噪声的非高斯性，这是重要的，不能忽视。与单独使用功率谱相比，结合功率谱、PDF和AdvACT的峰值计数将使平面上的宇宙学约束更加严格。
Unprecedentedly precise cosmic microwave background (CMB) data are expected from ongoing and near-future CMB stage III and IV surveys, which will yield reconstructed CMB lensing maps with effective resolution approaching several arcminutes. The small-scale CMB lensing fluctuations receive non-negligible contributions from nonlinear structure in the late-time density field. These fluctuations are not fully characterized by traditional two-point statistics, such as the power spectrum. Here, we use-body ray-tracing simulations of CMB lensing maps to examine two higher-order statistics: the lensing convergence one-point probability distribution function (PDF) and peak counts. We show that these statistics contain significant information not captured by the two-point function and provide specific forecasts for the ongoing stage III Advanced Atacama Cosmology Telescope (AdvACT) experiment. Considering only the temperature-based reconstruction estimator, we forecast(PDF) and(peaks) detections of these statistics with AdvACT. Our simulation pipeline fully accounts for the non-Gaussianity of the lensing reconstruction noise, which is significant and cannot be neglected. Combining the power spectrum, PDF, and peak counts for AdvACT will tighten cosmological constraints in theplane by, compared to using the power spectrum alone.
变革性地解耦聚类和示踪剂偏差
DOI：
10.1017/s1743921314013702
发表时间：
2014
期刊：
Proceedings of the International Astronomical Union
影响因子：
--
作者：
M. Neyrinck
通讯作者：
M. Neyrinck