论文标题
转化为共形的费米坐标对准单一场非高斯性的影响
Impact of transforming to Conformal Fermi Coordinates on Quasi-Single Field Non-Gaussianity
论文作者
论文摘要
在总体相对性的预测中，可观察到的数量可以以独立的方式表示。尽管如此，这样做可能会带来不便。使用特定的框架可能是将理论预测与可测量数量联系起来的最简单方法。对于宇宙学曲率双光谱，这种框架由保形费米坐标描述。在单场通货膨胀中，表明进入该框架取消了在整体坐标中计算的密度扰动双光谱的挤压极限。当Curvaton质量和Curvaton-Inflaton混合较小时，我们将在准单场通货膨胀中探索这个问题。在这种情况下，从坐标转换到共形的费米坐标的双光谱的贡献与从Aftraton-Curvaton相互作用项的顺序相同，但并未取消。
In general relativity predictions for observable quantities can be expressed in a coordinate independent way. Nonetheless it may be inconvenient to do so. Using a particular frame may be the easiest way to connect theoretical predictions to measurable quantities. For the cosmological curvature bispectrum such frame is described by the Conformal Fermi Coordinates. In single field inflation it was shown that going to this frame cancels the squeezed limit of the density perturbation bispectrum calculated in Global Coordinates. We explore this issue in quasi single field inflation when the curvaton mass and the curvaton-inflaton mixing are small. In this case, the contribution to the bispectrum from the coordinate transformation to Conformal Fermi Coordinates is of the same order as that from the inflaton-curvaton interaction term but does not cancel it.
