Metrics in the space of curves

Abstract

In this paper we study geometries on the manifold of curves. We define a manifold $M$ where objects $c\in M$ are curves, which we parameterize as $c:S^1\to {\Re }^n$ ($n\ge 2$, $S^1$ is the circle). Given a curve $c$, we define the tangent space $T_{c}M$ of $M$ at $c$ including in it all deformations $h:S^1\to {\Re }^n$ of $c$. We discuss Riemannian and Finsler metrics $F(c,h)$ on this manifold $M$, and in particular the case of the geometric $H^0$ metric $F(c,h)=\int |h{|}^{2}ds$ of normal deformations $h$ of $c$; we study the existence of minimal geodesics of $H^0$ under constraints; we moreover propose a conformal version of the $H^0$ metric.

59 pages, 10 figures