体粘宇宙学
Bulk Viscous Cosmology
摘要：
我们提出了一个方案，其中宇宙的暗成分是一个单一的大体积粘性流体的表现形式。使用动力系统的方法，进行定性研究的均匀，各向同性的背景情况下，以确定所有可能的解决方案的相空间。我们研究的具体模型与背景中的广义Chaubergin气体有相似之处，但其特征在于非绝热压力扰动。这个模型是测试对超新星Ia型和物质功率谱数据。不同于其他对暗物质和暗能量的统一描述，物质功率谱表现良好，即，在小扰动尺度上没有不稳定性或振荡。该模型与目前最流行的描述宇宙学暗区的建议相比具有竞争力。
英文摘要：
We propose a scenario in which the dark components of the Universe are manifestations of a single bulk viscous fluid. Using dynamical system methods, a qualitative study of the homogeneous, isotropic background scenario is performed in order to determine the phase space of all possible solutions. The specific model which we investigate shares similarities with a generalized Chaplygin gas in the background but is characterized by non-adiabatic pressure perturbations. This model is tested against supernova type Ia and matter power spectrum data. Different from other unified descriptions of dark matter and dark energy, the matter power spectrum is well behaved, i.e., there are no instabilities or oscillations on small perturbation scales. The model is competitive in comparison with the currently most popular proposals for the description of the cosmological dark sector.
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