Effective Temperature in a Colloidal Glass
  We study the Brownian motion of particles trapped by optical tweezers inside a colloidal glass (Laponite) during the sol-gel transition. We use two methods based on passive rheology to extract the effective temperature from the fluctuations of the Brownian particles. All of them give a temperature that, within experimental errors, is equal to the heat bath temperature. Several interesting features concerning the statistical properties and the long time correlations of the particles are observed during the transition. 
Pierre Jop (Phys-ENS), Artyom Petrosyan (Phys-ENS), Sergio Ciliberto   (Phys-ENS)