The Geometry of a $q$-Deformed Phase Space
  The geometry of the $q$-deformed line is studied. A real differential calculus is introduced and the associated algebra of forms represented on a Hilbert space. It is found that there is a natural metric with an associated linear connection which is of zero curvature. The metric, which is formally defined in terms of differential forms, is in this simple case identifiable as an observable. 
B.L. Cerchiai, R. Hinterding, J. Madore, J. Wess