  We consider the physics of a matrix model describing D0-brane dynamics in the
presence of an RR flux background. Non-commuting spaces arise as generic
soltions to this matrix model, among which fuzzy spheres have been studied
extensively as static solutions at finite N. The existence of topologicaly
distinct static configurations suggests the possibility of D-brane topology
change within this model, however a dynamical solution interpolating between
topologies is still somewhat elusive. In this paper, we study this model in the
limit of infinite dimensional matrices, where new solutions-- the fuzzy
cylinder and the fuzzy plane among them-- appear. We argue that any dynamics
which involves topology change will likely only occur in this limit, after
which we study the decay of a fuzzy cylinder into an infinite collection of
fuzzy spheres as both a classical and a quantum phenomenon. We conclude from
this excercise that in certain limits, matrix models offer a viable framework
in which to study topological dynamics, and could perhaps be a precursor to a
viable theory of space-time topological dynamics.

High Energy Physics - Theory