Please use this identifier to cite or link to this item: http://ri.ufs.br/jspui/handle/riufs/468
Document Type: Artigo
Title: Effective-temperature concept: a physical application for nonextensive statistical mechanics
Authors: Souza, André Maurício Conceição de
Nobre, Fernando Dantas
Curado, Evaldo Mendonca Fleury
Issue Date: Dec-2012
Abstract: The H-theorem [(df/dt) ≤ 0] for a free-energy functional, f = u-θs (with u and s representing, respectively, the internal energy and a generalized entropy of a given physical system), has been proven previously by making use of a nonlinear Fokker-Planck equation. Herein we focus on a nonlinear Fokker-Planck equation derived by means of a coarse-graining procedure on the equations of motion of a system of interacting vortices, under overdamped motion, in the absence of thermal noise (T = 0). In this case, we show that the parameter θ is directly related to the density as well as to the interactions among vortices. Generalized quantities such as entropy, internal energy, free energy, and heat capacity are analyzed for varying θ: important relations and physical behavior analogous to those of standard thermodynamics are found, showing that θ plays the role of an effective temperature. Estimates of θ in typical physical situations of different type-II superconductors are presented; in addition to this, possible experimental procedures for varying θ are proposed.
Keywords: Temperatura efetiva
Mecânica Estatística Não Extensiva
ISSN: 1550-2376
Publisher / Institution : American Physical Society
Citation: NOBRE, F. D.; SOUZA, A. M. C.; CURADO, E. M. F. Effective-temperature concept: a physical application for nonextensive statistical mechanics. Physical Review. E, New York, v. 86, n. 6, dez. 2012. Disponível em: <http://link.aps.org/doi/10.1103/PhysRevE.86.061113>. Acesso em: 27 mar. 2013.
License: © 2012 The American Physical Society
URI: https://ri.ufs.br/handle/riufs/468
Appears in Collections:DFI - Artigos de periódicos

Files in This Item:
File Description SizeFormat 
Effective-temperatureConcept.pdf177,74 kBAdobe PDFThumbnail
View/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.