J. Phys. IV France 08 (1998) Pr6-49-Pr6-56
Aging in a simple model of a structural glassL. Peliti1, 2 and M. Sellitto1
1 Dipartimento di Scienze Fisiche and Unità INFM, Università Federico II, Mostra d'Oltremare, Pad. 19, 80125 Napoli, Italy
2 Associato INFM, Sezione di Napoli
We consider a simple model of a structural glass, represented by a lattice gas with kinetic constraints in contact with a particle reservoir. Quench below the glass transition is represented by the jump of the chernical potential above a threshold. After a quench, the density approaches the critical density-where the diffusion coefficient of the particles vanishes-following a power law in time. In this regime, the two-time self-correlation functions exhibit aging. The behavior of the model can be understood in terms of simple mean-field arguments.
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