标题： 宇宙微波背景的角三重谱 显示英文标题

标题： The Angular Bispectrum of The Cosmic Microwave Background

摘要： COBE为我们提供了宇宙背景辐射各向异性的全天空图。 然而，即使在四年COBE数据可用时噪声水平可以忽略不计，宇宙方差将阻止我们获得关于原初涨落高斯性质的信息。 通过研究宇宙微波背景各向异性的角三谱，解决了这个重要问题。 给出了角三谱的一般形式，并计算了高斯涨落的角三谱的宇宙方差。 使用角三谱的优势在于可以选择那些最小化宇宙方差项的多极矩。 在大多数物理上有动机的非高斯模型中，非高斯信号相对于宇宙方差来说很小。 除非振幅很大，否则在那些角三谱平坦或随着多极矩增加而增加的模型中，非高斯信号才可能在COBE数据中被检测到。 显示英文摘要

摘要： COBE has provided us with a whole-sky map of the CBR anisotropies. However, even if the noise level is negligible when the four year COBE data are available, the cosmic variance will prevent us from obtaining information about the Gaussian nature of the primordial fluctuations. This important issue is addressed here by studying the angular bispectrum of the cosmic microwave background anisotropies. A general form of the angular bispectrum is given and the cosmic variance of the angular bispectrum for Gaussian fluctuations is calculated. The advantage of using the angular bispectrum is that one can choose to use the multipole moments which minimize the cosmic variance term. The non-Gaussian signals in most physically motivated non-Gaussian models are small compared with cosmic variance. Unless the amplitudes are large, the non-Gaussian signals are only detectable in the COBE data in those models where the angular bispectrum is flat or increases with increasing multipole moment.