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题名: A statistical-mechanical explanation of dark matter halo properties
作者: Kang, DB ;  He, P
刊名: ASTRONOMY & ASTROPHYSICS
出版日期: 2011
卷号: 526, 期号:*, 页码:A147
关键词: VIOLENT RELAXATION ;  ENTROPY PRINCIPLE ;  DENSITY SLOPE ;  H-FUNCTIONS ;  SYSTEMS
学科分类: Physics
通讯作者: Kang, DB (reprint author), Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China.
部门归属: [Kang, D. -B.; He, P.] Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China
英文摘要: Context. Cosmological N-body simulations have revealed many empirical relationships of dark matter halos, yet the physical origin of these halo properties still remains unclear. On the other hand, the attempts to establish the statistical mechanics for self-gravitating systems have encountered many formal difficulties, and little progress has been made for about fifty years. Aims. The aim of this work is to strengthen the validity of the statistical-mechanical approach we have proposed previously to explain the dark matter halo properties. Methods. By introducing an effective pressure instead of the radial pressure to construct the specific entropy, we use the entropy principle and proceed in a similar way as previously to obtain an entropy stationary equation. Results. An equation of state for equilibrated dark halos is derived from this entropy stationary equation, by which the dark halo density profiles with finite mass can be obtained. We also derive the anisotropy parameter and pseudo-phase-space density profile. All these predictions agree well with numerical simulations in the outer regions of dark halos. Conclusions. Our work provides further support to the idea that statistical mechanics for self-gravitating systems is a viable tool for investigation.
资助者: National Basic Research Programm of China [2010CB832805]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000286458400159
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/14416
Appears in Collections:理论物理所2011年知识产出_期刊论文

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Kang, DB,He, P. A statistical-mechanical explanation of dark matter halo properties[J]. ASTRONOMY & ASTROPHYSICS,2011,526(*):A147.
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