An Invariant Theory of Spacelike Surfaces in the Four-dimensional Minkowski Space

Details An Invariant Theory of Spacelike Surfaces in the Four-dimensional Minkowski Space An Invariant Theory of Spacelike Surfaces in the Four-dimensional Minkowski Space

2010-11-19

arxiv.org/abs/1011.4379v1

Mathematics

Differential Geometry

23 pages; to appear in Mediterr. J. Math., Vol. 9 (2012)

Scientific paper

We consider spacelike surfaces in the four-dimensional Minkowski space and introduce geometrically an invariant linear map of Weingarten-type in the tangent plane at any point of the surface under consideration. This allows us to introduce principal lines and an invariant moving frame field. Writing derivative formulas of Frenet-type for this frame field, we obtain eight invariant functions. We prove a fundamental theorem of Bonnet-type, stating that these eight invariants under some natural conditions determine the surface up to a motion. We show that the basic geometric classes of spacelike surfaces in the four-dimensional Minkowski space, determined by conditions on their invariants, can be interpreted in terms of the properties of the two geometric figures: the tangent indicatrix, and the normal curvature ellipse. We apply our theory to a class of spacelike general rotational surfaces.

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