Stationary Solutions of the Curvature Preserving Flow on Space Curves

Abstract

We study a geometric flow on curves, immersed in ${\mathbb{R}}^3$, that have strictly positive torsion. The evolution equation is given by $$X_t=\frac{1}{\sqrt{\tau }}\text{B}$$ where $\tau$ is the torsion and $\text{B}$ is the unit binormal vector. In the case of constant curvature, we find all of the stationary solutions and linearize the PDE for torsion around stationary solutions admitting an explicit formula. Afterwards, we prove the $L^2(\mathbb{R})$ linear stability of the stationary solutions corresponding to helices with constant curvature and constant torsion.

12 pages, 3 figures. We have added a discussion on the linearization of the torsion evolution equation around helix stationary solutions

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