Weak elastic energy of rectifiable curves in Riemannian surfaces

Abstract

We introduce a weak elastic energy for rectifiable curves on compact orientable smooth Riemannian surfaces without boundary. The energy is defined by relaxation starting from a notion of $p$-rotation of inscribed geodesic polygonals, that is obtained by a local construction in normalized isothermal coordinates. For every exponent $p>1$, the resulting relaxed functional detects precisely the intrinsic second-order Sobolev regularity of the arc-length parameterization of the curve. Furthermore, when the relaxed energy is finite, it agrees with the integral of the $p$-power of the geodesic curvature.

18 pages, 1 figure