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arXiv 1003.6097astro-ph.COgr-qchep-phhep-th
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在宇宙微波背景中寻找原初非高斯性

Hunting for Primordial Non-Gaussianity in the Cosmic Microwave Background

Eiichiro Komatsu

摘要:

自2002年COBE数据首次给出了(局部)原始非高斯性参数fNL的极限以来,CMB的观测一直在约束原始波动中各种形式的非高斯性的振幅方面发挥着核心作用。WMAP 7年数据的当前68%极限是fNL=32+/-21,普朗克卫星预计将在几年内将不确定性降低四倍。如果普朗克发现fNL>>1具有很高的统计意义,那么所有的单场暴胀模型都将被排除。此外,如果普朗克卫星发现fNL=30,那么它将能够使用τ NL>=(6 fNL/5)^[2]的四点函数(三谱)检验来检验一大类多场模型。在这篇文章中,我们回顾了从CMB数据中测量原始非高斯性的方法(最佳估计),结果(WMAP 7年)和挑战(二次各向异性,二阶效应和前景),提出了三光谱的科学案例,并总结了未来的前景。

英文摘要:

Since the first limit on the (local) primordial non-Gaussianity parameter, fNL, was obtained from COBE data in 2002, observations of the CMB have been playing a central role in constraining the amplitudes of various forms of non-Gaussianity in primordial fluctuations. The current 68% limit from the 7-year WMAP data is fNL=32+/-21, and the Planck satellite is expected to reduce the uncertainty by a factor of four in a few years from now. If fNL>>1 is found by Planck with high statistical significance, all single-field models of inflation would be ruled out. Moreover, if the Planck satellite finds fNL=30, then it would be able to test a broad class of multi-field models using the four-point function (trispectrum) test of tauNL>=(6fNL/5)^2. In this article, we review the methods (optimal estimator), results (WMAP 7-year), and challenges (secondary anisotropy, second-order effect, and foreground) of measuring primordial non-Gaussianity from the CMB data, present a science case for the trispectrum, and conclude with future prospects.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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