Discrete approximations to integrals over unparametrized paths

We discuss measures on spaces of unparametrized paths related to the Wiener measure. These measures arise naturally in the study of one-dimensional gr avity coupled to scalar fields. Two kinds of discrete approximations are de fined, the piecewise linear and the hypercubic approximations. The converge nce of these approximations in the sense of weak convergence of measures is proven. We describe a family of sets of unparametrized paths that are anal ogous to cylinder sets of parametrized paths. Integrals over some of these sets are evaluated in terms of Dirichlet propagators in bounded regions. (C ) 2001 American Institute of Physics.