Estimate for index of hypersurfaces in spheres with null higher order mean curvature |
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Authors: | A Barros P Sousa |
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Institution: | 1. Departamento de Matemática, UFC, 60455-760, Fortaleza, CE, Brazil 2. Departamento de Matemática, UFPI, 64049-550, Teresina, PI, Brazil
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Abstract: | In a recent paper (Barros, Sousa in: Kodai Math. J. 2009) the authors proved that closed oriented non-totally geodesic minimal hypersurfaces of the Euclidean unit sphere have index of stability greater than or equal to n + 3 with equality occurring at only Clifford tori provided their second fundamental forms A satisfy the pinching: |A|2 ≥ n. The natural generalization for this pinching is ?(r + 2)S r+2 ≥ (n ? r)S r > 0. Under this condition we shall extend such result for closed oriented hypersurface Σ n of the Euclidean unit sphere ${\mathbb{S}^{n+1}}$ with null S r+1 mean curvature by showing that the index of r-stability, ${Ind_{\Sigma^n}^{r}}$ , also satisfies ${Ind_{\Sigma^n}^{r}\ge n+3}$ . Instead of the previous hypothesis if we consider ${\frac{S_{r+2}}{{S_r}}}$ constant we have the same conclusion. Moreover, we shall prove that, up to Clifford tori, closed oriented hypersurfaces ${\Sigma^{n}\subset \mathbb{S}^{n+1}}$ with S r+1 = 0 and S r+2 < 0 have index of r-stability greater than or equal to 2n + 5. |
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