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.

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至关重要。我们研究了 G 膨胀模型的原始双谱，预测原始标量功率谱中的尖峰和宽峰。我们数值计算了等边极限和挤压极限中的非高斯参数f _NL，并确认这些模型中的一致性关系成立。尽管f _NL在功率谱达到峰值之前的尺度上变大，在功率谱中有摆动的尺度上，它在峰值尺度上仍然很小。因此，非高斯性对标量诱导的二次引力波和原始黑洞丰度的贡献预计可以忽略不计。