@. @bullet?h, une fonction d'échelle inconnue supposée avoir une forme piquée en fréquence. ? H(?? ? (t age )) pourrait être un peu différente (à priori) de la fonction d'échelle à l'équilibre H(?? ? (T )) déjà introduite pour les mesures à T > T g, Remarquons que cette fonction complexe contient des facteurs numériques inconnus

. Remarquons-que-la-température-effective-dépend-elle-aussi-de-l-'âge-du-système, une expérience spécifique très délicate (confère section 1.3.4) De plus, à notre connaissance, il n'existe pas de modèles théoriques permettant de la calculer avec précision pour les liquides moléculaires dans le régime de nos expériences Nous n'avons donc pu ni mesurer sa dépendance temporelle, ni la calculer. Notons toutefois que d'après les mesures réalisées par Grigera et Israeloff [60] sur du glycérol et Buisson et al [77] sur du polycarbonate, pour des valeurs de T f inal de l'ordre de 0.90 ? 0.98T g , la violation du théorème de fluctuation-dissipation est beaucoup plus faible lors de trempes lentes (? 2 ? 4K.min ?1 ) que lors de trempes rapides (? 50K.min ?1 ) En particulier, les résultats obtenus par Grigera et Israeloff [60] présentés à la section 1.3.4 (voir figure 1.20), montrent que pour une vitesse de trempe d'environ 1K.min ?1 et T f inal ? 0.92T g la violation est seulement de moins de 3%, après avoir passé T g . Nos conditions expérimentales étant proches de celles de Grigera et Israeloff (voir section 5.1.3.1), nous pouvons raisonnablement supposer que la température effective de notre échantillon n'excède la température du thermostat que de quelques degrés au début de nos expériences de vieillissement simple. De ce fait, le pourcentage de variation de la température effective devrait être faible devant celui du nombre moyen de molécules dynamiquement corrélées N corr, 2000.

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