标题： 宇宙磁场的一致性关系 显示英文标题

标题： Consistency relation for cosmic magnetic fields

摘要： 如果宇宙磁场确实是在暴胀期间产生的，它们很可能与导致宇宙微波背景各向异性及大尺度结构的标量度规扰动相关联。 在一个典型的暴胀磁化生成模型中，我们展示了存在一个新的简单一致性关系，即标量度规扰动与磁场平方的非高斯交叉关联函数在度规扰动动量趋于零的挤压极限下的关系。 我们强调，这一一致性关系对于检验文献中一些近期的计算结果非常有用。 除了由曲率扰动引起的原初非高斯性之外，这种交叉关联可能提供一种新的暴胀观测探针，并且原则上可以揭示宇宙磁场的原初性质。 显示英文摘要

摘要： If cosmic magnetic fields are indeed produced during inflation, they are likely to be correlated with the scalar metric perturbations that are responsible for the Cosmic Microwave Background anisotropies and Large Scale Structure. Within an archetypical model of inflationary magnetogenesis, we show that there exists a new simple consistency relation for the non-Gaussian cross correlation function of the scalar metric perturbation with two powers of the magnetic field in the squeezed limit where the momentum of the metric perturbation vanishes. We emphasize that such a consistency relation turns out to be extremely useful to test some recent calculations in the literature. Apart from primordial non-Gaussianity induced by the curvature perturbations, such a cross correlation might provide a new observational probe of inflation and can in principle reveal the primordial nature of cosmic magnetic fields.