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题名: Saddle-point entropy states of equilibrated self-gravitating systems
作者: He, P ;  Kang, DB
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2011
卷号: 414, 期号:1, 页码:L21-L25
关键词: DARK-MATTER HALOES ;  VIOLENT RELAXATION ;  H-FUNCTIONS
学科分类: Physics
通讯作者: He, P (reprint author), Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China.
部门归属: [He, Ping; Kang, Dong-Biao] Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China
英文摘要: In this Letter, we investigate the stability of the statistical equilibrium of spherically symmetric collisionless self-gravitating systems. By calculating the second variation of the entropy, we find that perturbations of the relevant physical quantities should be classified as long-and short-range perturbations, which correspond to the long-and short-range relaxation mechanisms, respectively. We show that the statistical equilibrium states of self-gravitating systems are neither maximum nor minimum, but complex saddle-point entropy states, and hence differ greatly from the case of ideal gas. Violent relaxation should be divided into two phases. The first phase is the entropy-production phase, while the second phase is the entropy-decreasing phase. We speculate that the second-phase violent relaxation may just be the long-wave Landau damping, which would work together with short-range relaxations to keep the system equilibrated around the saddle-point entropy states.
资助者: National Basic Research Program 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:000292141600005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/14345
Appears in Collections:理论物理所2011年知识产出_期刊论文

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Recommended Citation:
He, P,Kang, DB. Saddle-point entropy states of equilibrated self-gravitating systems[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,414(1):L21-L25.
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