Spectral index and running of $g_{NL}$ from an isocurvature scalar field
Spectral index and running of $g_{NL}$ from an isocurvature scalar field
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DOI：
10.1088/1475-7516/2011/04/010
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发表时间：
2011-02
期刊：
影响因子：
--
通讯作者：
Q. Huang
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文献类型：
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作者：
Q. Huang
原始非高斯性可能是由高阶项决定的，例如由g_{NL}$而不是f_{NL}$决定的。本文导出了单等曲率标量场g_{NL}$的谱指数和游程。如果等曲率场的质量与暴胀期间的哈勃参数相比不太小，则非高斯参数的尺度依赖性是可检测的。此外，我们还将所得结果应用于具有近二次势的曲率模型。
It is possible that the primordial non-Gaussianity is dominated by the higher order terms, such as that set by $g_{NL}$, not $f_{NL}$. In this paper we derive the spectral index and running of $g_{NL}$ from a single isocurvature scalar field. The scale dependences of non-Gaussianity parameters are detectable if the mass of isocurvature field is not too small compared to the Hubble parameter during inflation. In addition, we also apply our results to investigate the curvaton model with near quadratic potential in detail.