Effect of non-Gaussian lensing deflections on CMB lensing measurements
Effect of non-Gaussian lensing deflections on CMB lensing measurements
复制标题
非高斯透镜偏转对 CMB 透镜测量的影响
DOI：
10.1103/physrevd.98.123510
复制
发表时间：
2018
影响因子：
5
通讯作者：
Böhm V
中科院分区：
文献类型：
--
作者：
Böhm V
我们研究了非高斯透镜偏转对CMB透镜功率谱测量的影响。我们发现，他们的高斯性的错误假设显着偏见，这些测量在当前和未来的实验中的百分比水平。通过将来自用高斯偏转场透镜化的模拟CMB数据的CMB透镜化重建与来自用完全非高斯偏转场透镜化的模拟的重建进行比较来检测偏差。通过N体模拟的快照通过射线追踪产生非高斯偏转，并捕获由非线性结构形成和由多个相关偏转引起的非高斯性。我们发现，当透镜双谱模型中包含后玻恩校正时，可以用Böhmetal.in 2016推导的透镜双谱引起的偏差的解析表达式来建模测量偏差的幅度。在基于温度的测量中，偏差是最大的，在重建的收敛场的功率谱中，它被检测到具有显著性。互相关的重建与无噪声的输入收敛领域的结果在一个检测。我们没有找到证据证明偏振场组合的测量存在偏差（）。我们认为，这种非高斯偏置应该是更重要的CMB透镜与低红移示踪剂的大尺度结构的互相关测量。
We investigate the impact of non-Gaussian lensing deflections on measurements of the CMB lensing power spectrum. We find that the false assumption of their Gaussianity significantly biases these measurements in current and future experiments at the percent level. The bias is detected by comparing CMB lensing reconstructions from simulated CMB data lensed with Gaussian deflection fields to reconstructions from simulations lensed with fully non-Gaussian deflection fields. The non-Gaussian deflections are produced by ray tracing through snapshots of an N-body simulation and capture both the non-Gaussianity induced by nonlinear structure formation and by multiple correlated deflections. We find that the amplitude of the measured bias can be modeled with analytic expressions for a lensing bispectrum-induced bias derived by Böhmet al.in 2016 when post-Born corrections are included in the lensing bispectrum model. The bias is largest in temperature-based measurements, where it is detected with a significance ofin the power spectrum of reconstructed convergence fields. Cross-correlating the reconstruction with the noiseless input convergence fields results in adetection. We do not find evidence for the bias in measurements from a combination of polarization fields (). We argue that this non-Gaussian bias should be even more important for measurements of cross-correlations of CMB lensing with low-redshift tracers of large-scale structure.
登录
查看更多内容
透镜非高斯性对 CMB 功率谱的影响
影响因子：
6.4
作者：
A. Lewis;G. Pratten
通讯作者：
G. Pratten
DOI：
--
发表时间：
2017
期刊：
影响因子：
--
作者：
Valentin Assassi;M. Simonović;M. Zaldarriaga
通讯作者：
M. Zaldarriaga
DOI：
10.1088/0004-637x/756/2/142
发表时间：
2012-02
期刊：
The Astrophysical Journal
影响因子：
--
作者：
A. V. Engelen;R. Keisler;O. Zahn;K. Aird;B. Benson;L. Bleem;J. Carlstrom;J. Carlstrom;C. Chang;C. Chang;Hsiao-mei Cho.;T. Crawford;A. Crites;T. Haan;M. Dobbs;J. Dudley;E. George;N. Halverson;G. Holder;W. Holzapfel;S. Hoover;Z. Hou;J. Hrubeš;M. Joy;L. Knox;Adrian T. Lee;Adrian T. Lee;E. Leitch;M. Lueker;D. Luong-Van;J. McMahon;J. Mehl;S. Meyer;M. Millea;J. Mohr;T. Montroy;T. Natoli;S. Padin;S. Padin;T. Plagge;C. Pryke;C. Reichardt;J. Ruhl;J. Sayre;K. Schaffer;K. Schaffer;L. Shaw;E. Shirokoff;H. Spieler;Z. Staniszewski;A. Stark;K. Story;K. Vanderlinde;J. Vieira;R. Williamson
通讯作者：
A. V. Engelen;R. Keisler;O. Zahn;K. Aird;B. Benson;L. Bleem;J. Carlstrom;J. Carlstrom;C. Chang;C. Chang;Hsiao-mei Cho.;T. Crawford;A. Crites;T. Haan;M. Dobbs;J. Dudley;E. George;N. Halverson;G. Holder;W. Holzapfel;S. Hoover;Z. Hou;J. Hrubeš;M. Joy;L. Knox;Adrian T. Lee;Adrian T. Lee;E. Leitch;M. Lueker;D. Luong-Van;J. McMahon;J. Mehl;S. Meyer;M. Millea;J. Mohr;T. Montroy;T. Natoli;S. Padin;S. Padin;T. Plagge;C. Pryke;C. Reichardt;J. Ruhl;J. Sayre;K. Schaffer;K. Schaffer;L. Shaw;E. Shirokoff;H. Spieler;Z. Staniszewski;A. Stark;K. Story;K. Vanderlinde;J. Vieira;R. Williamson
根据 100 平方度的 SPTPOL 数据测量宇宙微波背景引力透镜势
DOI：
10.1088/0004-637x/810/1/50
发表时间：
2014
期刊：
The Astrophysical Journal
影响因子：
--
作者：
K. Story;D. Hanson;P. Ade;K. Aird;J. Austermann;J. Beall;A. Bender;A. Bender;B. Benson;B. Benson;L. Bleem;L. Bleem;J. Carlstrom;C. Chang;C. Chang;H. Chiang;H.;R. Citron;T. Crawford;A. Crites;A. Crites;T. Haan;M. Dobbs;M. Dobbs;W. Everett;J. Gallicchio;Jiansong Gao;E. George;A. Gilbert;N. Halverson;N. Harrington;J. Henning;J. Henning;G. Hilton;G. Holder;W. Holzapfel;S. Hoover;Z. Hou;J. Hrubeš;N. Huang;J. Hubmayr;K. Irwin;R. Keisler;L. Knox;Adrian T. Lee;Adrian T. Lee;E. Leitch;Dale Li;Dale Li;C. Liang;D. Luong;J. McMahon;J. Mehl;J. Mehl;S. Meyer;L. Mocanu;T. Montroy;T. Natoli;J. Nibarger;V. Novosad;S. Padin;S. Padin;C. Pryke;C. Reichardt;C. Reichardt;J. Ruhl;B. Saliwanchik;J. Sayre;K. Schaffer;K. Schaffer;G. Smecher;A. Stark;C. Tucker;K. Vanderlinde;J. Vieira;Gensheng Wang;N. Whitehorn;V. Yefremenko;O. Zahn
通讯作者：
O. Zahn
影响因子：
5
作者：
M. Madhavacheril;J. Hill
通讯作者：
M. Madhavacheril;J. Hill