玻色-爱因斯坦凝聚体和简并费米核暗物质晕
Bose-Einstein condensate and degenerate Fermi cored dark matter halos
摘要：
在过去的几年里，人们对星系和星系团的中心区域可能有高度浓缩的暗物质（DM）核心这一观点产生了相当大的兴趣。特别是，有人提出，暗物质可以形成玻色-爱因斯坦凝聚体（BEC）或简并费米核。我们研究这些可能性的假设下，核心包括高度凝聚的DM（玻色子或费米子），嵌入在一个弥漫的信封（例如，等温球）。我们的方法的新颖之处在于，我们调用复合多面体来模拟球形无碰撞结构的方式，是物理直观的，可以推广到包括其他状态方程（EOS）。我们的模型是非常适合的BEC核心（由超轻玻色子），已提出解决小规模CDM异常的分析。我们表明，分析可以很容易地应用到玻色子或没有小的排斥自相互作用。相对于简并费米核心，我们确认，1 - 1000千电子伏之间的费米子粒子的质量不排除的意见。最后，我们注意到，这种方法可以扩展到包括广泛的EOS除了多组分碰撞系统。
英文摘要：
There has been considerable interest in the last several years in support of the idea that galaxies and clusters could have highly condensed cores of dark matter (DM) within their central regions. In particular, it has been suggested that dark matter could form Bose--Einstein condensates (BECs) or degenerate Fermi cores. We examine these possibilities under the assumption that the core consists of highly condensed DM (either bosons or fermions) that is embedded in a diffuse envelope (e.g., isothermal sphere). The novelty of our approach is that we invoke composite polytropes to model spherical collisionless structures in a way that is physically intuitive and can be generalized to include other equations of state (EOSs). Our model is very amenable to the analysis of BEC cores (composed of ultra-light bosons) that have been proposed to resolve small-scale CDM anomalies. We show that the analysis can readily be applied to bosons with or without small repulsive self-interactions. With respect to degenerate Fermi cores, we confirm that fermionic particle masses between 1 -- 1000 keV are not excluded by the observations. Finally, we note that this approach can be extended to include a wide range of EOSs in addition to multi-component collisionless systems.
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