Classification and construction of minimal translation surfaces in Euclidean space

TL;DR

This paper classifies minimal translation surfaces in Euclidean 3-space, providing explicit construction methods and characterizing generating curves via solutions to specific differential equations.

Contribution

It offers a complete classification of minimal translation surfaces, including explicit examples and a characterization of generating curves through autonomous ODEs.

Findings

Includes plane and Scherk-type minimal surfaces.

Generates surfaces from curves satisfying a specific autonomous ODE.

Describes curvature and torsion relations of generating curves.

Abstract

A translation surface of Euclidean space $\r^3$ is the sum of two regular curves $\alpha$ and $\beta$, called the generating curves. In this paper we classify the minimal translation surfaces of $\r^3$ and we give a method of construction of explicit examples. Besides the plane and the minimal surfaces of Scherk type, it is proved that up to reparameterizations of the generating curves, any minimal translation surface is described as $\Psi(s,t)=\alpha(s)+\alpha(t)$, where $\alpha$ is a curve parameterized by arc length $s$, its curvature $\kappa$ is a positive solution of the autonomous ODE $(y')^2+y^4+c_3y^2+c_1^2y^{-2}+c_1c_2=0$ and its torsion is $\tau(s)=c_1/\kappa(s)^2$. Here $c_1\not=0$, $c_2$ and $c_3$ are constants such that the cubic equation $-\lambda^3+c_2\lambda^2-c_3\lambda+c_1=0$ has three real roots $\lambda_1$, $\lambda_2$ and $\lambda_3$.