CMB delensing beyond the B modes-猫眼课题宝

B 模式之外的 CMB 消镜

DOI：

发表时间：

2016

期刊：

影响因子：

通讯作者：

中科院分区：

文献类型：

作者：

D. Green;Joel Meyers;A. V. Engelen

大尺度结构的引力透镜显著影响了宇宙微波背景（CMB）的观测：它平滑了温度和E模式偏振功率谱中的声学峰，使先前不相关的模式相关;它将E模式偏振转换为B模式偏振。在B模的背景下，已经很好地研究了测量和从CMB图中去除透镜效应或去透镜的行为，但是很少注意温度和E模的去透镜。在本文中，我们的预期delensed T和E功率谱的所有订单的透镜潜在的模型，展示了锐化的声学峰值和显着减少透镜引起的功率谱协方差。然后，我们进行宇宙学预测，表明脱透镜将产生更好的敏感性参数与即将到来的调查。作为一个具体的应用，我们着重讨论了中微子有效数与原初氦分数之间简并性的破缺。我们还表明，delensing增加宇宙学信息，只要测量的透镜重建包括在分析中。我们的结论是，随着未来的数据，脱透镜将是至关重要的，不仅对原始的B模式科学，但对一系列其他观测以及。

Gravitational lensing by large-scale structure significantly impacts observations of the cosmic microwave background (CMB): it smooths the acoustic peaks in temperature and E-mode polarization power spectra, correlating previously uncorrelated modes; and it converts E-mode polarization into B-mode polarization. The act of measuring and removing the effect of lensing from CMB maps, or delensing, has been well studied in the context of B modes, but little attention has been given to the delensing of the temperature and E modes. In this paper, we model the expected delensed T and E power spectra to all orders in the lensing potential, demonstrating the sharpening of the acoustic peaks and a significant reduction in lens-induced power spectrum covariances. We then perform cosmological forecasts, demonstrating that delensing will yield improved sensitivity to parameters with upcoming surveys. We highlight the breaking of the degeneracy between the effective number of neutrino species and primordial helium fraction as a concrete application. We also show that delensing increases cosmological information as long as the measured lensing reconstruction is included in the analysis. We conclude that with future data, delensing will be crucial not only for primordial B-mode science but for a range of other observables as well.

A MEASUREMENT OF GRAVITATIONAL LENSING OF THE MICROWAVE BACKGROUND USING SOUTH POLE TELESCOPE DATA

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：

CMB lensing beyond the power spectrum: Cosmological constraints from the one-point probability distribution function and peak counts

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

发表时间： 2016

期刊：

Physical Review D

影响因子： 5

作者：

Liu, Jia;Hill, J. Colin;Sherwin, Blake D.;Petri, Andrea;Böhm, Vanessa;Haiman, Zoltán

通讯作者：

Haiman, Zoltán

CMB delensing beyond the B modes

B 模式之外的 CMB 消镜

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