We employ non-perturbative renormalisation group methods to compute the full momentum dependence of propagators in quantum gravity in general dimensions. We disentangle all different graviton and Faddeev–Popov ghost modes and find qualitative differences in the momentum dependence of their propagators. This allows us to reconstruct the form factors that are quadratic in curvature from first principles, which enter physical observables like scattering cross sections. The results are qualitatively stable under variations of the gauge fixing choice.

中文翻译：

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量子引力中的非微扰传播器

我们采用非微扰重整化群方法来计算一般维度中量子引力中传播子的完整动量依赖性。我们解开所有不同的引力子和 Faddeev-Popov 鬼模，并发现它们传播子的动量依赖性存在质的差异。这使我们能够根据第一原理重建曲率二次的形状因子，这些形状因子进入物理可观察量，如散射截面。在仪表固定选择的变化下，结果在质量上是稳定的。