标题： 宇宙背景辐射的各向异性与非均匀性限制 显示英文标题

标题： LIMITS ON ANISOTROPY AND INHOMOGENEITY FROM THE COSMIC BACKGROUND RADIATION,

摘要： 我们直接考虑物质通过微扰使自由传播的背景辐射产生各向异性这一问题，从而提出了一种利用各向异性测量限制宇宙偏离弗里德曼-罗伯逊-沃克（FRW）几何的新方法。 这种方法与通常使用的萨克斯-沃尔夫方法互补：所得限制不如后者详细，但更加模型无关。 此外，我们在几乎FRW宇宙中给出了关于物质-辐射扰动的一些新结果，并得到了线性化方程的一个新的精确解。 显示英文摘要

摘要： We consider directly the equations by which matter imposes anisotropies on freely propagating background radiation, leading to a new way of using anisotropy measurements to limit the deviations of the Universe from a Friedmann-Robertson-Walker (FRW) geometry. This approach is complementary to the usual Sachs-Wolfe approach: the limits obtained are not as detailed, but they are more model-independent. We also give new results about combined matter-radiation perturbations in an almost-FRW universe, and a new exact solution of the linearised equations.