Tohoku Mathematical Journal
2021
September
SECOND SERIES VOL. 73, NO. 3

Tohoku Math. J.
73 (2021), 317-339

Title SURFACES OF REVOLUTION WITH PRESCRIBED MEAN AND SKEW CURVATURES IN LORENTZ-MINKOWSKI SPACE

Author Luiz C. B. da Silva

(Received April 12, 2018, revised May 13, 2019)
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 $S$.

Mathematics Subject Classification. Primary 53A10; Secondary 53A55, 53B30.
Key words and phrases. Lorentz-Minkowski space, surface of revolution, skew curvature, mean curvature, Lorentz number.

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