A simple model of uniformly expanding, homogeneous Universe with a bulk viscosity is studied wherein the inflationary density decays due to viscous dissipation during the expansion phase of the Universe. The model is shown to generate the Cosmic Microwave Background radiation (CMB). We also demonstrate that, at late times, the inflationary density asymptotically approaches a small finite constant value.

中文翻译：

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通过体积粘度产生 CMB 和宇宙学常数

研究了具有体积粘度的均匀膨胀、均质宇宙的简单模型，其中膨胀密度由于宇宙膨胀阶段的粘性耗散而衰减。该模型显示产生宇宙微波背景辐射 (CMB)。我们还证明，在后期，暴胀密度渐近地接近一个小的有限常数值。