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Activated aging dynamics and negative fluctuation-dissipation ratios | | Peter Mayer
; Sébastien Léonard
; Ludovic Berthier
; Juan P Garrahan
; Peter Sollich
; | | Date: |
27 Jan 2006 | | Journal: | Phys Rev Lett, 96 (3), 030602 | | Abstract: | In glassy materials, aging proceeds at large times via thermal activation. We show that this can lead to negative dynamical response functions and novel and well-defined violations of the fluctuation-dissipation theorem, in particular, negative fluctuation-dissipation ratios. Our analysis is based on detailed theoretical and numerical results for the activated aging regime of simple kinetically constrained models. The results are relevant to a variety of physical situations, such as aging in glass formers, thermally activated domain growth, and granular compaction. | | Source: | PubMed, pmid16486676 | | Services: | Forum | Review | Favorites | |
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