  Non commutative geometry is creating new possibilities for physics. Quantum
spacetime geometry and post inflationary models of the universe with matter
creation have an enormous range of scales of time, distance and energy in
between. There is a variety of physics possible till the nucleosynthesis epoch
is reached. The use of topology and non commutative geometry in cosmology is a
recent approach. This paper considers the possibility of topological solutions
of a vortex kind given by non commutative structures. These are interpreted as
dark matter, with the grand unified Yang-Mills field theory energy scale used
to describe its properties. The relation of the model with other existing
theories is discussed.
