大尺度多分量自引力系统的结构、振荡和孤子
Structures, oscillations and solitons in large-scale multi-component self-gravitating systems
摘要：
我们用自相互作用两分量模型研究了大的自引力天体物理系统的动力学结构。我们考虑两种情况，星系团和宇宙壁，为说明。在这两种情况下，稳定性分析进行微扰膨胀。我们发现在这些系统中很容易产生波和孤子。我们的分析表明，如果暗物质有很大的内部自由度，那么在星系团的内部区域，暗物质可能是Jeans不稳定的。暗物质核心可能会在外部扰动下坍缩。我们还讨论了星系团中的暗物质振荡以及模的增长和衰变如何导致团内介质的加热。我们的分析表明，在宇宙壁中可以激发出正负振幅的暗物质孤子。孤子相互作用中的共振可以增强气体凝聚。这两种暗物质孤子的共存意味着在暗空洞中可以产生亮丝。
英文摘要：
We investigate the structure of dynamics of large self-gravitating astrophysical systems using a self-interacting two-component model. We consider two cases, galaxy clusters and cosmic walls, for illustrations. In both cases stability analyses are conducted using perturbative expansion. We have found that waves and solitons are easily generated in these systems. Our analysis shows that dark matter can be Jeans unstable in the very inner regions of galaxy clusters if it has a large internal degree of freedom. The dark matter core may collapse under external perturbations. We also discuss dark-matter oscillations in galaxy clusters and how mode growth and decay lead to heating of intracluster medium. Our analysis shows that dark-matter solitons with both positive and negative amplitudes can be excited in cosmic walls. Resonances in soliton interaction could enhance gas condensation. The co-existence of the two types of dark-matter solitons implies that bright filaments can arise in dark voids.
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