  In the context of the random first order transition theory we use an extended
mode coupling theory of the glass transition that includes activated events to
account for spatiotemporal structures in aging and rejuvenating glasses. We
numerically solve fluctuating dynamical equations for mobility and fictive
temperature fields which capture both mobility generation through activated
events and facilitation effects. Upon rejuvenating, a source of high mobility
at a glass surface initiates a growth front of mobility which propagates into
the unstable low mobility region. The speed of the front is consistent with
experiments on the rejuvenation of stable glasses, which "melt" from their
surface.
