论文标题
修订的$ f _ {\ rm nl} $参数
Revised $f_{\rm NL}$ parameter in Curvaton Scenario
论文作者
论文摘要
我们使用广义$Δn$形式主义来修改规范曲面场景的非高斯风格，其中它可以处理通用潜力。在各种Curvaton模型中，能量密度在不同时期内主要是占主导地位，包括曲线的二次膨胀，物质统治和辐射统治。我们的方法可以统一处理这些时期，因为非线性参数$ f _ {\ rm nl} $与非高斯性关联是状态$ w $方程的函数。我们首先研究了最简单的曲线场景，即具有二次潜力的混沌曲线。我们的研究表明，大多数参数空间都满足观察性约束。而且，在没有非线性演化的情况下，我们的公式将很好地恢复$ f _ {\ rm nl} $的众所周知的值。从Curvaton的微观起源来看，我们还研究了伪-Nambu-Goldstone Curvaton。我们的结果清楚地表明，根据观察结果，排除了伪 - nambu-goldstone Curvaton的第二个短期通货膨胀过程。最后，我们的方法提出了一种研究库瓦顿机制非高斯的新方法，特别是探索MSSM Curvaton模型中的非高斯性。
We revise the Non-Gaussianity of canonical curvaton scenario with a generalized $δN$ formalism, in which it could handle the generic potentials. In various curvaton models, the energy density is dominant in different period including the secondary inflation of curvaton, matter domination and radiation domination. Our method could unify to deal with these periods since the non-linearity parameter $f_{\rm NL}$ associated with Non-Gaussianity is a function of equation of state $w$. We firstly investigate the most simple curvaton scenario, namely the chaotic curvaton with quadratic potential. Our study shows that most parameter space satisfies with observational constraints. And our formula will nicely recover the well-known value of $f_{\rm NL}$ in the absence of non-linear evolution. From the micro origin of curvaton, we also investigate the Pseudo-Nambu-Goldstone curvaton. Our result clearly indicates that the second short inflationary process for Pseudo-Nambu-Goldstone curvaton is ruled out in light of observations. Finally, our method sheds a new way for investigating the Non-Gaussianity of curvaton mechanism, espeically for exploring the Non-Gaussianity in MSSM curvaton model.
