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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: <>. Acesso em: 27 mar. 2013.
License: © 2012 The American Physical Society
Appears in Collections:DFI - Artigos de periódicos

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