Surfaces of revolution with prescribed mean and skew curvatures in Lorentz-Minkowski space

Abstract

In this work, we investigate the problem of finding surfaces in the Lorentz-Minkowski 3-space with prescribed skew ($S$) and mean ($H$) curvatures, which are defined through the discriminant of the characteristic polynomial of the shape operator and its trace, respectively. After showing that $H$ and $S$ can be interpreted in terms of the expected value and standard deviation of the normal curvature seen as a random variable, we address the problem of prescribed curvatures for surfaces of revolution. For surfaces with a non-lightlike axis and prescribed $H$, the strategy consists in rewriting the equation for $H$, which is initially a nonlinear second order Ordinary Differential Equation (ODE), as a linear first order ODE with coefficients in a certain ring of hypercomplex numbers along the generating curves: complex numbers for curves on a spacelike plane and Lorentz numbers for curves on a timelike plane. We also solve the problem for surfaces of revolution with a lightlike axis by using a certain ODE with real coefficients. On the other hand, for the skew curvature problem, we rewrite the equation for $S$, which is initially a nonlinear second order ODE, as a linear first order ODE with real coefficients. In all the problems, we are able to find the parameterization for the generating curves in terms of certain integrals of $H$ and $S$.

25 pages (23 in the published version), 4 figures. Key-words: Lorentz-Minkowski space, surface of revolution, skew curvature, mean curvature, Lorentz number

References in corpus (3)

• Quantum mechanics of a constrained particle and the problem of prescribed geometry-induced potential
• Moving frames and the characterization of curves that lie on a surface
• The geometry of Gauss map and shape operator in simply isotropic and pseudo-isotropic spaces

Cited by in corpus (1)

• Schrödinger formalism for a particle constrained to a surface in ${\mathbb{R}}_1^3$