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PreprintarXiv licencearXiv

A Ruh-Vilms theorem for hypersurfaces in Weitzenböck geometry

  • Dongha Lee
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Abstract

A well-known theorem by Ruh and Vilms states that the Laplacian of the Gauss map for a smooth immersion into Euclidean space is given by the covariant derivative of the mean curvature vector field. For hypersurfaces, this implies that the Gauss map is harmonic iff the mean curvature is constant. In this paper, we extend this result to hypersurfaces in Weitzenböck geometry. While Riemannian geometry corresponds to the curved geometry without torsion, Weitzenböck geometry is a flat geometry with torsion. They represent two opposite extremes of Riemann-Cartan geometry.

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Cite

BibTeXRIS
BibTeX
@misc{lee2026ruhvilms,
  title = {{A Ruh-Vilms theorem for hypersurfaces in Weitzenböck geometry}},
  author = {Dongha Lee},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2605.05698},
  eprint = {2605.05698},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.05698},
}
RIS
TY  - UNPB
TI  - A Ruh-Vilms theorem for hypersurfaces in Weitzenböck geometry
AU  - Dongha Lee
PY  - 2026
DA  - 2026/09/09
PB  - arXiv
DO  - 10.48550/arxiv.2605.05698
UR  - https://arxiv.org/abs/2605.05698
AB  - A well-known theorem by Ruh and Vilms states that the Laplacian of the Gauss map for a smooth immersion into Euclidean space is given by the covariant derivative of the mean curvature vector field. For hypersurfaces, this implies that the Gauss map is harmonic iff the mean curvature is constant. In this paper, we extend this result to hypersurfaces in Weitzenböck geometry. While Riemannian geometry corresponds to the curved geometry without torsion, Weitzenböck geometry is a flat geometry with torsion. They represent two opposite extremes of Riemann-Cartan geometry.
ER  -