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Jeu. 03/04/2014 10:30 Petite Ourse, Bâtiment 13, Etage 1 GRADENIGO Giacomo (IPhT, CEA Saclay) Local effective action for a glass-forming liquid: a numerical study (Physique Statistique) A very interesting quantity that can be measured in the simulations of atomistic models of supercooled liquids is the free energy cost V(q) to keep two configurations at a given distance in phase space, namely at a given overlap "q". In my talk I will illustrate one of the techniques that can be used to measure numerically the thermodynamic potential V(q), and how we applied it to a 3d system of particles interacting via a modified Lennard-Jones potential. In particular I will discuss how from V(q) we extracted the amorphous surface tension, a quantity which, according to the Random First-Order Transition theory for the glass transition, is a master piece in the thermodynamic description of supercooled liquids. I will also show how the numerical study of correlations functions like < V(q) V(q') > gives us a direct way to test one of the most intriguing assumptions on the thermodynamics of supercooled liquids, i.e. the presence of some "self-induced" disorder in the low temperature phase. Pour plus d'informations, merci de contacter Berthier L. |
