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A statistical-mechanical explanation of dark matter halo properties

文献类型：期刊论文

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
ISSN号0004-6361
通讯作者Kang, DB (reprint author), 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.
学科主题Physics
收录类别SCI
资助信息National Basic Research Programm of China [2010CB832805]
原文出处http://dx.doi.org/10.1051/0004-6361/201015057
语种英语
WOS记录号WOS:000286458400159
公开日期2013-05-17
源URL[http://ir.itp.ac.cn/handle/311006/14416]  
专题理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式
GB/T 7714		 Kang, DB,He, P. A statistical-mechanical explanation of dark matter halo properties[J]. ASTRONOMY & ASTROPHYSICS,2011,526(*):A147.
APA Kang, DB,&He, P.(2011).A statistical-mechanical explanation of dark matter halo properties.ASTRONOMY & ASTROPHYSICS,526(*),A147.
MLA Kang, DB,et al."A statistical-mechanical explanation of dark matter halo properties".ASTRONOMY & ASTROPHYSICS 526.*(2011):A147.

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来源：理论物理研究所

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