Abstract
In this note, we investigate conformally flat submanifolds of Euclidean space with positive index of relative nullity. Let \(M^n\) be a complete conformally flat manifold and let \(f:M^n\rightarrow \mathord {\mathbb {R}}^m\) be an isometric immersion. We prove the following results: (1) If the index of relative nullity is at least two, then \(M^n\) is flat and f is a cylinder over a flat submanifold. (2) If the scalar curvature of \(M^n\) is non-negative and the index of relative nullity is positive, then f is a cylinder over a submanifold with constant non-negative sectional curvature. (3) If the scalar curvature of \(M^n\) is non-zero and the index of relative nullity is constant and equal to one, then f is a cylinder over a \((n-1)\)-dimensional submanifold with non-zero constant sectional curvature.
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Onti, CR. On Complete Conformally Flat Submanifolds with Nullity in Euclidean Space. Results Math 75, 106 (2020). https://doi.org/10.1007/s00025-020-01233-0
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DOI: https://doi.org/10.1007/s00025-020-01233-0