Activated aging dynamics and negative fluctuation-dissipation ratios Auteur(s): Mayer Peter, Leonard Sébastien, Berthier L., Garrahan Juan P., Sollich Peter (Article) Publié: Physical Review Letters, vol. 96 p.030602 (2006) Texte intégral en Openaccess : Ref HAL: hal-00115937_v1 PMID 16486676 Ref Arxiv: cond-mat/0508686 DOI: 10.1103/PhysRevLett.96.030602 WoS: 000234969300010 Ref. & Cit.: NASA ADS Exporter : BibTex | endNote 26 Citations Résumé: 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. Commentaires: 4 pages, 4 figs; v2 final version (minor modifs) published in Phys. Rev. Lett |