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28 March 2024
 
  » arxiv » cond-mat/0508686

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Activated aging dynamics and negative fluctuation-dissipation ratios
Peter Mayer ; Sébastien Léonard ; Ludovic Berthier ; Juan P. Garrahan ; Peter Sollich ;
Date 29 Aug 2005
Subject Statistical Mechanics | cond-mat.stat-mech
AbstractIn 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 arXiv, cond-mat/0508686
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