Knowledge Management System of Institute of Theoretical Physics, CAS
| 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 | |
| Source Publication | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| Language | 英语 |
| Keyword | Dark-matter Haloes Violent Relaxation H-functions |
| Abstract | 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 |
| Volume | 414Issue:1Pages:L21-L25 |
| Subject Area | Physics |
| Indexed By | SCI |
| Funding Organization | 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] |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.itp.ac.cn/handle/311006/14345 |
| Collection | 理论物理所科研产出_SCI论文 |
| Corresponding Author | He, P (reprint author), Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China. |
| Recommended Citation 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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| Saddle-point entropy（111KB） | 开放获取 | License | Application Full Text | |||
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