Saddle-point entropy states of equilibrated self-gravitating systems
文献类型：期刊论文
| 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 |
| ISSN号 | 0035-8711 |
| 通讯作者 | He, P (reprint author), 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. |
| 学科主题 | Physics |
| 收录类别 | SCI |
| 资助信息 | National Basic Research Program of China [2010CB832805] |
| 原文出处 | http://dx.doi.org/10.1111/j.1745-3933.2011.01046.x |
| 语种 | 英语 |
| WOS记录号 | WOS:000292141600005 |
| 公开日期 | 2013-05-17 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/14345]  |
| 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 | 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. |
| APA | He, P,&Kang, DB.(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. |
入库方式： OAI收割
来源：理论物理研究所
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