On classification of models of large local-type non-Gaussianity
On classification of models of large local-type non-Gaussianity
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DOI：
10.1088/1475-7516/2010/12/030
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发表时间：
2010
影响因子：
6.4
通讯作者：
T. Suyama;Tomo Takahashi;Masahide Yamaguchi;Shuichiro Yokoyama
中科院分区：
文献类型：
--
作者：
T. Suyama;Tomo Takahashi;Masahide Yamaguchi;Shuichiro Yokoyama
利用非线性参数fNL local、τ NL local和gNL local之间的“一致性关系”，将产生大的局部型非高斯性的模型分为几类，其中fNL local、τ NL local和gNL local分别表征前者的双谱和后者的三谱的大小.然后，我们讨论了如何可以区分大的局部型非高斯模型与这样的关系。我们首先使用τ NL局部/（6 fNL局部/5）2的比率对模型进行分类，该比率对于"单源“模型是统一的，而对于"多源”模型偏离统一。利用fNLlocal和gNLlocal之间的关系，可以对每一类模型进行进一步的分类。我们的分类表明，三谱的观测将是非常有帮助的区分大的非高斯模型，并可能揭示原始波动的产生机制。
We classify models generating large local-type non-Gaussianity into some categories by using some ``consistency relations'' among the non-linearity parameters fNLlocal,τNLlocal and gNLlocal, which characterize the size of bispectrum for the former and trispectrum for the latter two. Then we discuss how one can discriminate models of large local-type non-Gaussianity with such relations. We first classify the models by using the ratio of τNLlocal/(6fNLlocal/5)2, which is unity for ``single-source'' models and deviates from unity for ``multi-source'' ones. We can make a further classification of models in each category by utilizing the relation between fNLlocal and gNLlocal. Our classification suggests that observations of trispectrum would be very helpful to distinguish models of large non-Gaussianity and may reveal the generation mechanism of primordial fluctuations.