On Null Cartan Rectifying Isophotic and Rectifying Silhouette Curves Lying on a Timelike Surface in Minkowski Space $\mathbb{E}^3_1$

Milica Grbović ćirić; Jelena Djordjević; Emilija Nesovic

doi:10.36890/iejg.1447199

Research Article

On Null Cartan Rectifying Isophotic and Rectifying Silhouette Curves Lying on a Timelike Surface in Minkowski Space $\mathbb{E}^3_1$

Year 2024, , 171 - 183, 23.04.2024

Milica Grbović ćirić , Jelena Djordjević , Emilija Nesovic

https://doi.org/10.36890/iejg.1447199

Abstract

In this paper, we introduce generalized Darboux frames of the first and the second kind along a null Cartan curve lying on a timelike surface in Minkowski space ${E}^{3}_{1}$ and define null Cartan rectifying isophotic and rectifying silhouette curves in terms of the vector field that belongs to generalized Darboux frame of the first kind. We investigate null Cartan rectifying isophotic and rectifying silhouette curves with constant geodesic curvature $k_g$ and geodesic torsion $\tau_g$ and obtain the parameter equations of their axes. We prove that such curves are the null Cartan helices and the null Cartan cubics. We show that the introduced curves with a non-zero constant curvatures $k_g$ and $\tau_g$ are general helices, relatively normal-slant helices and isophotic curves with respect to the same axis. In particular, we find that null Cartan cubic lying on a timelike surface is rectifying isophotic and rectifying silhouette curve having a spacelike and a lightlike axis. Finally, we give some examples.

Keywords

Generalized Darboux frame, null Cartan curve, rectifying isophotic curve, rectifying silhouette curve

Supporting Institution

Serbian Ministry of Science, Technological Development and Inovations

Project Number

no project number

Thanks

The Authors are very grateful to Editors for giving an opportunity to submit this article for Special Issue dedicated to 80-th birthday of prof. B.Y.Chen.

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