粘性冷暗物质与观测一致
Viscous Cold Dark Matter in agreement with observations
摘要：
我们讨论了体粘滞宇宙模型。由于体粘滞压力是负的，原则上可以构建具有后期加速膨胀的可行粘性宇宙学场景。在讨论了一些基于体积粘性效应的替代模型后，我们将重点讨论与标准$Λ$ CDM非常相似的模型。我们认为，$Λ$ { \rm v}CDM模型，其中我们分配一个非常小的（虽然可察觉的）体积粘度的暗物质是在协议与现有的宇宙学观测。因此，我们的工作与粘性冷暗物质（{ \rm v}CDM）的概念。在扰动水平下，与标准CDM结构相比，{ \rm v}CDM结构的生长受到轻微抑制。考虑到$Λ$ CDM模型的小规模问题与过度聚集有关，我们的提议似乎指出了解决标准宇宙学模型中CDM范式严重缺陷的可能方向。
英文摘要：
We discuss bulk viscous cosmological models. Since the bulk viscous pressure is negative, viable viscous cosmological scenarios with late time accelerated expansion can in principle be constructed. After discussing some alternative models based on bulk viscous effects we will focus on a model very similar to the standard $Λ$CDM. We argue that a $Λ${\rm v}CDM model, where we assign a very small (albeit perceptible) bulk viscosity to dark matter is in agreement with available cosmological observations. Hence, we work with the concept of viscous Cold Dark Matter ({\rm v}CDM). At the level of the perturbations, the growth of {\rm v}CDM structures is slightly suppressed when compared with the standard CDM ones. Having in mind that the small scale problems of the $Λ$CDM model are related to an excess of clustering, our proposal seems to indicate a possible direction for solving the serious drawbacks of the CDM paradigm within the standard cosmological model.
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