A General Analysis of Non-Gaussianity from Isocurvature Perturbations
A General Analysis of Non-Gaussianity from Isocurvature Perturbations
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DOI：
10.1088/1475-7516/2009/01/042
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发表时间：
2008-10
期刊：
影响因子：
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通讯作者：
M. Kawasaki;K. Nakayama;Toyokazu Sekiguchi;T. Suyama;F. Takahashi
中科院分区：
文献类型：
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作者：
M. Kawasaki;K. Nakayama;Toyokazu Sekiguchi;T. Suyama;F. Takahashi
光标量在自然界中可能无处不在，它们的量子涨落会在宇宙微波背景温度各向异性中产生很大的非高斯性。非高斯性可能伴随着一小部分等曲率扰动，这些扰动通常与曲率扰动有关联。我们给出了一种在有关联和无关联的绝热和等温扰动中计算非高斯性的一般方法，并通过几个明显的例子说明了它是如何工作的。我们还发现，它们在宇宙微波背景温度涨落的双谱上留下了明显的特征。
Light scalars may be ubiquitous in nature, and their quantum fluctuations can produce large non-Gaussianity in the cosmic microwave background temperature anisotropy. The non-Gaussianity may be accompanied with a small admixture of isocurvature perturbations, which often have correlations with the curvature perturbations. We present a general method to calculate the non-Gaussianity in the adiabatic and isocurvature perturbations with and without correlations, and see how it works in several explicit examples. We also show that they leave distinct signatures on the bispectrum of the cosmic microwave background temperature fluctuations.