相互作用的粘性暗流体
Interacting viscous dark fluids
摘要：
我们修改了宇宙模型的物理可行性的条件，其中暗物质具有体积粘度，也与暗能量相互作用。我们还包括了辐射和重子物质成分;所有的物质成分都可以用完美流体来表示，除了暗物质，它被视为不完美流体。我们强加在模型上的条件，一个完整的宇宙动力学的结果在一个零或负的体积粘度，但后者也不同意与当地的热力学第二定律。该模型还与不同红移的宇宙学观测结果进行了比较：Ia型超新星，CMB的位移参数，BAO的声峰，和哈勃参数H（z）。在一般情况下，观察一致地指出一个负值的体积粘性系数，并在整体上的拟合过程中显示没有偏好的模型超过标准的LCDM模型。
英文摘要：
We revise the conditions for the physical viability of a cosmological model in which dark matter has bulk viscosity and also interacts with dark energy. We have also included radiation and baryonic matter components; all matter components are represented by perfect fluids, except the dark matter, that is treated as an imperfect fluid. We impose upon the model the condition of a complete cosmological dynamics that results in an either null or negative bulk viscosity, but the latter also disagrees with the Local Second Law of Thermodynamics. The model is also compared with cosmological observations at different redshifts: type Ia supernova, the shift parameter of CMB, the acoustic peak of BAO, and the Hubble parameter H(z). In general, observations consistently point out to a negative value of the bulk viscous coefficient, and in overall the fitting procedure shows no preference for the model over the standard LCDM model.
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