标题： 标量和张量度规扰动的混合 显示英文标题

标题： Mixing of scalar and tensor metric perturbations

摘要： 广义相对论中的度规摄动通常被分为三类：标量、向量和张量。 在许多情况下，这些模态是可以分离的，即它们满足每种模态各自独立的运动方程。 然而，在本文中我们论证了在许多情况下，无论选择什么样的规范条件，张量模态和标量模态都是不可分离的。 这些模态中任意一种的传播都依赖于其他的模态。 文中给出了一个提供这种混合的真实例子。 显示英文摘要

摘要： Metric perturbations in General Relativity are usually separated into three distinct classes: scalar, vector, and tensor. In many cases these modes are separable, i.e. they satisfy independent equations of motion for each mode. However, in the present paper we argue that in many cases tensor and scalar modes are not separable, no matter what gauge conditions are chosen. The propagation of any of these mode depends on the other. A realistic example providing such mixing is presented.