论文标题
模型中宇宙的加速膨胀，不均匀
Accelerated Expansion of the Universe in the Model with Non-Uniform Pressure
论文作者
论文摘要
我们介绍了斯蒂芬尼溶液的特殊情况，用于无剪切的完美流体，具有均匀的能量密度和不均匀的压力。这些模型似乎是考虑到诸如暗能的外来物质形式的替代方案，这些物质会导致宇宙扩展的加速。这些模型的特征是空间曲率取决于时间。我们根据Stephani类的精确解决方案分析了获得的宇宙学模型的性能，并将其采用到最近的观察数据中。研究了模型的空间几何形状。我们表明，尽管可能的奇异性，该模型仍可以描述宇宙演化的当前阶段。
We present the particular case of the Stephani solution for shear-free perfect fluid with uniform energy density and non-uniform pressure. Such models appeared as possible alternative to the consideration of the exotic forms of matter like dark energy that would cause the acceleration of the universe expansion. These models are characterised by the spatial curvature depending on time. We analyze the properties of the cosmological model obtained on the basis of exact solution of the Stephani class and adopt it to the recent observational data. The spatial geometry of the model is investigated. We show that despite possible singularities, the model can describe the current stage of the universe evolution.
