Résumé
We investigate by rheology and light scattering the influence of the elastic modulus,$G_0$ , on the slow dynamics and the aging of a soft glass. We show that the slow dynamics and the aging can be entirely described by the evolution of an effective viscosity,$\eta_{eff}$ , defined as the characteristic time measured in a stress relaxation experiment times$G_0$ . At all time,$\eta_{eff}$is found to be independent of$G_0$ , of elastic perturbations, and of the rate at which the sample is quenched in the glassy phase. We propose a simple model that links$\eta_{eff}$to the internal stress built up at the fluid-to-solid transition.