Totally quasi-umbilic timelike surfaces in $\mathbb{R}^{1,2}$

Details Totally quasi-umbilic timelike surfaces in $\mathbb{R}^{1,2}$ Totally quasi-umbilic timelike surfaces in $\mathbb{R}^{1,2}$

2010-06-22

arxiv.org/abs/1006.4380v2

Mathematics

Differential Geometry

19 pages

Scientific paper

For a regular surface in Euclidean space $\mathbb{R}^3$, umbilic points are precisely the points where the Gauss and mean curvatures $K$ and $H$ satisfy $H^2=K$; moreover, it is well-known that the only totally umbilic surfaces in $\mathbb{R}^3$ are planes and spheres. But for timelike surfaces in Minkowski space $\mathbb{R}^{1,2}$, it is possible to have $H^2=K$ at a non-umbilic point; we call such points {\em quasi-umbilic}, and we give a complete classification of totally quasi-umbilic timelike surfaces in $\mathbb{R}^{1,2}$.

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