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Nonlinear response and fluctuation-dissipation relations.
Lippiello, Eugenio; Corberi, Federico; Sarracino, Alessandro; Zannetti, Marco.
Afiliação
  • Lippiello E; Dipartimento di Scienze Fisiche, Universitá di Napoli Federico II, Naples, Italy. lippiello@sa.infn.it
Phys Rev E Stat Nonlin Soft Matter Phys ; 78(4 Pt 1): 041120, 2008 Oct.
Article em En | MEDLINE | ID: mdl-18999392
ABSTRACT
A unified derivation of the off-equilibrium fluctuation dissipation relations (FDRs) is given for Ising and continuous spins to arbitrary order, within the framework of Markovian stochastic dynamics. Knowledge of the FDRs allows one to develop zero field algorithms for the efficient numerical computation of the response functions. Two applications are presented. In the first one, the problem of probing for the existence of a growing cooperative length scale is considered in those cases, like in glassy systems, where the linear FDR is of no use. The effectiveness of an appropriate second order FDR is illustrated in the test case of the Edwards-Anderson spin glass in one and two dimensions. In the second application, the important problem of the definition of an off-equilibrium effective temperature through the nonlinear FDR is considered. It is shown that, in the case of coarsening systems, the effective temperature derived from the second order FDR is consistent with the one obtained from the linear FDR.
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Base de dados: MEDLINE Idioma: En Ano de publicação: 2008 Tipo de documento: Article
Buscar no Google
Base de dados: MEDLINE Idioma: En Ano de publicação: 2008 Tipo de documento: Article