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Abstract. { We study the aging of a colloidal glass, which is obtained for extremely low volume fractions due to strong electrostatic repulsions, leading to the formation of a \ glass. During the aging, a new crossover between a complete and incomplete decay of the correlation function is observed, accompanied by an increase in the non-ergodicity parameter. The dynamics can be described as a cage-diusion process. For short times, the escape of the particles from \ formed by neighbouring particles dominates; for long times the particles cannot escape anymore and the system becomes strongly non-ergodic. Glasses are a non-equilibrium form of matter and are, maybe for that reason, still ill-understood 1-4. The usual way of looking at the glass transition is given by the so-called schematic mode-coupling theory 1, 2. In this theory, the glass transition is a strong ergodic to non-ergodic transition. In real systems, however, the \ always appears rounded. The rounding of the transition is due to the appearance of a \ mode in the system 1-4. The non-equilibrium evolution of a system quenched into a glassy state is often referred to as aging, and is common to both structural and spin-glasses. Understanding the aging processes in a glassy system is crucial for the description of glassy dynamics; unfortunately, due to its
Bonn et al. (Fri,) studied this question.