Saddle-point entropy states of equilibrated self-gravitating systems

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	He, P; Kang, DB; He, P (reprint author), Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China.
	Saddle-point entropy states of equilibrated self-gravitating systems
发表期刊	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
语种	英语
关键词	Dark-matter Haloes Violent Relaxation H-functions
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.
	2011
ISSN	0035-8711
卷号	414 期号:1 页码:L21-L25
学科领域	Physics
收录类别	SCI
项目资助者	National Basic Research Program of China [2010CB832805] ; National Basic Research Program of China [2010CB832805] ; National Basic Research Program of China [2010CB832805] ; National Basic Research Program of China [2010CB832805]
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.itp.ac.cn/handle/311006/14345
专题	理论物理所科研产出_SCI论文
通讯作者	He, P (reprint author), Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China.
推荐引用方式 GB/T 7714	He, P,Kang, DB,He, P . Saddle-point entropy states of equilibrated self-gravitating systems[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,414(1):L21-L25.
APA	He, P,Kang, DB,&He, P .(2011).Saddle-point entropy states of equilibrated self-gravitating systems.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,414(1),L21-L25.
MLA	He, P,et al."Saddle-point entropy states of equilibrated self-gravitating systems".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 414.1(2011):L21-L25.

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