Submitted Paper

Inserted: 4 aug 2026
Last Updated: 4 aug 2026

Year: 2026

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.