Surfaces in $mathbb{R}^4$ with constant principal angles with respect to a plane

Details Surfaces in $mathbb{R}^4$ with constant principal angles with respect to a plane Surfaces in $mathbb{R}^4$ with constant principal angles with respect to a plane

2011-05-09

arxiv.org/abs/1105.1791v1

Mathematics

Differential Geometry

26 pages

Scientific paper

We study surfaces in $\R^4$ whose tangent spaces have constant principal angles with respect to a plane. Using a PDE we prove the existence of surfaces with arbitrary constant principal angles. The existence of such surfaces turns out to be equivalent to the existence of a special local symplectomorphism of $\R^2$. We classify all surfaces with one principal angle equal to 0 and observe that they can be constructed as the union of normal holonomy tubes. We also classify the complete constant angles surfaces in $\R^4$ with respect to a plane. They turn out to be extrinsic products. We characterize which surfaces with constant principal angles are compositions in the sense of Dajczer-Do Carmo. Finally, we classify surfaces with constant principal angles contained in a sphere and those with parallel mean curvature vector field.

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