Generalized local ansatz for scale-dependent primordial non-Gaussianities and future galaxy surveys
Generalized local ansatz for scale-dependent primordial non-Gaussianities and future galaxy surveys
复制标题
尺度相关的原初非高斯性和未来星系巡天的广义局部模拟
DOI：
10.1093/pasj/psab108
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发表时间：
2021
影响因子：
2.3
通讯作者：
Takahashi Tomo
中科院分区：
文献类型：
--
作者：
Yamauchi Daisuke;Yokoyama Shuichiro;Takahashi Tomo
我们重新审视了标量场扰动的超视界演化引起的局域型原始非高斯性的可能的尺度依赖性。我们发展的公式的基础上δN形式主义，并推导出的本地型双谱和三谱，这使我们能够实现的尺度依赖和适当的比较模型预测与观测数据的广义形式。我们提出了简单的，但现象学上有意义的表达式，其中包括广泛的物理动机模型的信息。我们还制定了一个大规模的功率谱和双谱的偏见对象存在的尺度依赖的原始非高斯性。我们进行Fisher分析，为未来的星系调查，并给出了投影约束的参数的广义本地形式的原始非高斯性。
We revisit a possible scale-dependence of local-type primordial non-Gaussianities induced by super-horizon evolution of scalar field perturbations. We develop the formulation based on δN formalism and derive the generalized form of the local-type bispectrum and also trispectrum which allows us to implement the scale-dependence and suitably compare model prediction with observational data. We propose simple but phenomenologically meaningful expressions, which encompass the information of a wide range of physically motivated models. We also formulate a large-scale power spectrum and bispectrum of biased objects in the presence of the scale-dependent primordial non-Gaussianities. We perform the Fisher analysis for future galaxy surveys and give the projected constraints on the parameters of the generalized local-form of primordial non-Gaussianities.