标题： 温胀宇宙学中的本征非高斯性：使用$δN$形式化方法 显示英文标题

标题： Primordial non-Gaussianity in warm inflation using $δN$ formalism

摘要： 首次利用一种 $\delta N$ 形式主义研究了由温胀模型生成的均匀密度超曲面上原初曲率扰动的非高斯性。 在引入温胀形式主义和 $\delta N$ 形式主义框架后，我们得到了描述慢滚近似下非高斯性的非线性参数 $f_{NL}$ 的解析表达式，并发现 $\delta N$ 形式主义给出了非常好的结果。 我们分析了 $f_{NL}$ 的大小，并将我们的结果与标准膨胀的结果进行了比较。然后讨论了两个具体的例子：四次混沌模型和丘顶模型。 四次势能模型在温胀场景中可以再次很好地符合普朗克的结果，我们给出了非线性参数如何依赖于温胀的耗散强度和膨胀量的具体结果。 我们发现这两种情况下非线性参数的范围都很好地落在普朗克允许的区域内。 显示英文摘要

摘要： A $\delta N$ formalism is used to study the non-Gaussianity of the primordial curvature perturbation on an uniform density hypersurfaces generated by the warm inflation for the first time. After introducing the framework of the warm inflation and the $\delta N$ formalism, we obtain an analytic expression for the nonlinear parameter $f_{NL}$ that describes the non-Gaussianity in slow roll approximation, and find that the $\delta N$ formalism gives a very good result. We analyse the magnitude of $f_{NL}$ and compare our result with those of the standard inflation. Then we discuss two concrete examples: the quartic chaotic model and the hilltop model. The quartic potential model can again be in very good agreement with the Planck results in the warm inflationary scenario, and we give out the concrete results of how the nonlinear parameter depends on the dissipation strength of the warm inflation and the amounts of expansion. We find that the range of the nonlinear parameters in these two cases are both well inside of the allowed region of Planck.