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He, Ping; Kang, Dong-Biao; He, P , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China
Entropy principle and complementary second law of thermodynamics for self-gravitating systems
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
KeywordDark-matter Halos Universal Density Profile Violent Relaxation Statistical-mechanics Phase-space Velocity Anisotropy Stellar-systems Galaxy Clusters H-functions Evolution
AbstractThe statistical mechanics of isolated collisionless self-gravitating systems is a long-held puzzle, which has not been successfully resolved for nearly 50 years. In this work, we employ a phenomenological entropy form of ideal gas, first proposed by White & Narayan, to revisit this issue. By calculating the first-order variation of the entropy, subject to the usual mass- and energy-conservation constraints, we obtain an entropy stationary equation. Incorporated with the Jeans equation, and by specifying some functional form for the anisotropy parameter beta, we numerically solve the two equations, and demonstrate that the velocity anisotropy parameter plays an important role in attaining a density profile that is finite in mass, energy and spatial extent. If incorporated again with some empirical density profile from simulations, our theoretical predictions of the anisotropy parameter, and the radial pseudo-phase-space density /Sigma 3(r) in the outer non-gravitationally degenerate region of the dark matter halo, agree rather well with the simulation data, and the predictions are also acceptable in the middle weak-degenerate region of the dark halo. The disagreements occur just in the inner strong-degenerate region because of the neglect of gravitational degeneracy. As far as we know, our results may be the first theoretical predictions based on the entropy principle that can partially match the empirical data. The second-order variational calculus reveals the seemingly paradoxical but actually complementary consequence that the equilibrium state of self-gravitating systems is the global minimum entropy state for the whole system under long-range violent relaxation, but simultaneously the local maximum entropy state for every and any small part of the system under short-range two-body relaxation and Landau damping. This minimum-maximum entropy duality means that the standard second law of thermodynamics needs to be re-expressed or generalized for self-gravitating systems. We believe that our findings, especially the complementary second law of thermodynamics, may provide crucial clues to the development of the statistical physics of self-gravitating systems as well as other long-range interaction systems.
2010
ISSN0035-8711
Volume406Issue:4Pages:2678-2688
Subject AreaPhysics
Indexed BySCI
Funding OrganizationChinese Academy of Sciences[KJCX3-SYW-N2, KJCX2.YW.W10]; National Basic Research Program of China[2010CB832805] ; Chinese Academy of Sciences[KJCX3-SYW-N2, KJCX2.YW.W10]; National Basic Research Program of China[2010CB832805] ; Chinese Academy of Sciences[KJCX3-SYW-N2, KJCX2.YW.W10]; National Basic Research Program of China[2010CB832805] ; Chinese Academy of Sciences[KJCX3-SYW-N2, KJCX2.YW.W10]; National Basic Research Program of China[2010CB832805]
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Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/5061
CollectionSCI期刊论文
Corresponding AuthorHe, P , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
He, Ping,Kang, Dong-Biao,He, P , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China. Entropy principle and complementary second law of thermodynamics for self-gravitating systems[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2010,406(4):2678-2688.
APA He, Ping,Kang, Dong-Biao,&He, P , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China.(2010).Entropy principle and complementary second law of thermodynamics for self-gravitating systems.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,406(4),2678-2688.
MLA He, Ping,et al."Entropy principle and complementary second law of thermodynamics for self-gravitating systems".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 406.4(2010):2678-2688.
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