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Observable dependent quasi-equilibrium in slow dynamics | | Peter Mayer
; Peter Sollich
; | | Date: |
31 Mar 2005 | | Journal: | Phys Rev E, 71 (4 Pt 2), 046113 | | Abstract: | We present examples demonstrating that quasi-equilibrium fluctuation-dissipation behavior at short time differences is not a generic feature of systems with slow nonequilibrium dynamics. We analyze in detail the nonequilibrium fluctuation-dissipation ratio X(t, t(w)) associated with a defect-pair observable in the Glauber-Ising spin chain. It turns out that X not = 1 throughout the short-time regime and in particular X(t(w), t(w)) = 3/4 for t(w) --> infinity. The analysis is extended to observables detecting defects at a finite distance from each other, where similar violations of quasi-equilibrium behavior are found. We discuss our results in the context of metastable states, which suggests that a violation of short-time quasi-equilibrium behavior could occur in general glassy systems for appropriately chosen observables. | | Source: | PubMed, pmid15903732 | | Other source: | [GID 690904] cond-mat/0405711 | | Services: | Forum | Review | Favorites | |
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