Spaces of curves with constrained curvature on hyperbolic surfaces
  Let $ S $ be a hyperbolic surface. We investigate the topology of the space of all curves on $ S $ which start and end at given points in given directions, and whose curvatures are constrained to lie in a given interval $ (\kappa_1,\kappa_2) $. Such a space falls into one of four qualitatively distinct classes, according to whether $ (\kappa_1,\kappa_2) $ contains, overlaps, is disjoint from, or contained in the interval $ [-1,1] $. Its homotopy type is computed in the latter two cases. We also study the behavior of these spaces under covering maps when $ S $ is arbitrary (not necessarily hyperbolic nor orientable) and show that if $ S $ is compact then they are always nonempty. 
Nicolau C. Saldanha and Pedro Z\"uhlke
math.GT math.DG