Primordial non-Gaussianity from G-inflation
Primordial non-Gaussianity from G-inflation
复制标题
G 暴胀的原始非高斯性
DOI：
10.1088/1475-7516/2021/04/045
复制
发表时间：
2021
影响因子：
6.4
通讯作者：
Yi Zhu
中科院分区：
文献类型：
--
作者：
Zhang Fengge;Gong Yungui;Lin Jiong;Lu Yizhou;Yi Zhu
关于相互作用的大量信息包含在原始曲率扰动的非高斯性中，这对于打破暴胀模型的简并性是必不可少的。我们研究了G-暴胀模型的原始双谱，预测原始标量功率谱中的尖峰和宽峰。数值计算了等边极限和压缩极限下的非高斯性参数fNL，证实了这两种模型的相容关系成立。即使fNL在功率谱到达峰值之前的尺度和功率谱中存在摆动的尺度处变大，它在峰值尺度处仍然是小的。因此，非高斯性对标量诱导次级引力波和原初黑洞丰度的贡献可以忽略不计。
Enormous information about interactions is contained in the non-Gaussianities of the primordial curvature perturbations, which are essential to break the degeneracy of inflationary models. We study the primordial bispectra for G-inflation models predicting both sharp and broad peaks in the primordial scalar power spectrum. We calculate the non-Gaussianity parameter f NL in the equilateral limit and squeezed limit numerically, and confirm that the consistency relation holds in these models. Even though f NL becomes large at the scales before the power spectrum reaches the peak and the scales where there are wiggles in the power spectrum, it remains to be small at the peak scales. Therefore, the contributions of non-Gaussianity to the scalar induced secondary gravitational waves and primordial black hole abundance are expected to be negligible.