A spectral curve approach to Lawson symmetric CMC surfaces of genus 2

TL;DR

This paper develops a spectral curve framework for Lawson symmetric constant mean curvature surfaces of genus 2, using flat connection parametrization and Hitchin's abelianization to analyze their moduli space and deformations.

Contribution

It introduces a spectral curve approach for Lawson symmetric CMC surfaces, explicitly parametrizes their moduli space via flat line bundles, and studies isospectral deformations.

Findings

Spectral curve theory applies to Lawson surfaces and similar symmetric minimal surfaces.

Explicit parametrization of flat connections using Hitchin's abelianization.

Isospectral deformations are generated by simple factor dressing.

Abstract

Minimal and CMC surfaces in $S^3$ can be treated via their associated family of flat $\SL(2,\C)$-connections. In this the paper we parametrize the moduli space of flat $\SL(2,\C)$-connections on the Lawson minimal surface of genus 2 which are equivariant with respect to certain symmetries of Lawson's geometric construction. The parametrization uses Hitchin's abelianization procedure to write such connections explicitly in terms of flat line bundles on a complex 1-dimensional torus. This description is used to develop a spectral curve theory for the Lawson surface. This theory applies as well to other CMC and minimal surfaces with the same holomorphic symmetries as the Lawson surface but different Riemann surface structure. Additionally, we study the space of isospectral deformations of compact minimal surface of genus $g\geq2$ and prove that it is generated by simple factor dressing.