Fluid-like entropy and equilibrium statistical mechanics of self-gravitating systems
文献类型：期刊论文
| 作者 | Kang, DB ; He, P |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2011 |
| 卷号 | 416期号:1页码:32-37 |
| ISSN号 | 0035-8711 |
| 关键词 | RELAXED STELLAR-SYSTEMS DARK-MATTER HALOES STAR-CLUSTERS THERMODYNAMICS INSTABILITY EVOLUTION GALAXIES DYNAMICS MODELS FAMILY |
| 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 | The statistical mechanics of self-gravitating systems has not been well understood, and still remains an open question so far. In a previous study by Kang & He, we showed that the fluid approximation may give a clue to investigate this problem further. In fact, there are indeed many dynamical similarities between self-gravitating and fluid systems. Based on a fluid-like entropy, that work explained successfully the outer density profiles of dark matter haloes, but there remain some drawbacks with the calculation concerning the extremizing process of the entropy. In the current paper, with the improved extremizing calculation - including an additional differential constraint of dynamical equilibrium and without any other assumptions, we confirm that statistical-mechanical methods can give a density profile with finite mass and finite energy. Moreover, this density profile is also consistent with the observational surface brightness of the elliptical galaxy NGC 3379. In our methods, the density profile is derived from the equation of state, which is obtained from the entropy principle but does not correspond to the maximum entropy of the system. Finally, we suggest an alternative entropy form, a hybrid of Boltzmann-Gibbs and Tsallis entropy, whose global maximum may give rise to this equation of state. |
| 学科主题 | Physics |
| 资助信息 | National Basic Research Program of China [2010CB832805] |
| 收录类别 | SCI |
| 原文出处 | http://dx.doi.org/10.1111/j.1365-2966.2011.18920.x |
| 语种 | 英语 |
| WOS记录号 | WOS:000294017000004 |
| 公开日期 | 2013-05-17 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/14283]  |
| 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. Fluid-like entropy and equilibrium statistical mechanics of self-gravitating systems[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,416(1):32-37. |
| APA | Kang, DB,&He, P.(2011).Fluid-like entropy and equilibrium statistical mechanics of self-gravitating systems.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,416(1),32-37. |
| MLA | Kang, DB,et al."Fluid-like entropy and equilibrium statistical mechanics of self-gravitating systems".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 416.1(2011):32-37. |
入库方式： OAI收割
来源：理论物理研究所
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