论文标题
宇宙中线性扰动的增长
Growth of Linear Perturbations in a Universe with Superfluid Dark Matter
论文作者
论文摘要
Lambda-Cold暗物质（LCDM）模型与大多数宇宙学观察结果一致，但在较小尺度（例如星系）上观察到的数据受到了一些障碍。最近，Berezhiani和Khoury（2015）提出了一种新的理论，涉及与三个模型参数相互作用的超流量，该理论以非常准确的方式解释了银河动力学。在目前的工作中，我们研究了该模型在宇宙学扰动的线性状态下的宇宙学行为。特别是，我们在分析和数字上都要计算物质线性生长因子，并为模型参数获得新的界限，该界限明显比以前发现的明显更强。这些新的约束来自以下事实：超流晶框架内的结构比LCDM中的结构更快，并且当DM-Baryon相互作用较强时。
The Lambda-Cold Dark Matter (LCDM) model agrees with most of the cosmological observations, but has some hindrances from observed data at smaller scales such as galaxies. Recently, Berezhiani and Khoury (2015) proposed a new theory involving interacting superfluid dark matter with three model parameters, which explains galactic dynamics with great accuracy. In the present work, we study the cosmological behaviour of this model in the linear regime of cosmological perturbations. In particular, we compute both analytically and numerically the matter linear growth factor and obtain new bounds for the model parameters which are significantly stronger than previously found. These new constraints come from the fact that structures within the superfluid dark matter framework grow quicker than in LCDM, and quite rapidly when the DM-baryon interactions are strong.
