Translation hypersurfaces with constant Sr curvature in the Euclidean space
In this paper, we give a complete description of all translation hypersurfaces with constant r-curvature Sr, in the Euclidean space.
math.DG↗
arXiv subjects
Newton Luis Santos
Publications and source records attributed to Newton Luis Santos.
Deformation and rigidity results for the 2k-Ricci tensor and the 2k-Gauss-Bonnet curvature
We present several deformation and rigidity results within the classes of closed Riemannian manifolds which either are $2k$-Einstein (in the sense that their $2k$-Ricci tensor is constant) or have constant $2k$-Gauss-Bonnet curvature. The results hold for a family of manifolds containing all non-flat space forms and the main ingredients in the proofs are explicit formulae for the linearizations of the above invariants obtained by means of the formalism of double forms.
math.DG↗
A theorem of do Carmo-Zhou type: oscillations and estimates for the first eigenvalue of the p-Laplacian
It is shown that the estimates obtained by Manfredo P. do Carmo and Detang Zhou, in their paper "Eigenvalue estimate on complete noncompact Riemannian manifolds and applications", for the first eigenvalue of the Laplace-Beltrami operator on open manifolds, via an oscillation theorem, can be naturally extended for the semi-elliptic singular operator operator, p-Laplace on manifolds.
math.DG↗
The Yamabe problem for Gauss-Bonnet curvatures: a local result around space forms
It is shown in the paper "Variational Properties of the Gauss-Bonnet Curvatures" of M.L. Labbi, that metrics with constant 2k-Gauss-Bonnet curvature on a closed n-dimensional manifold, 1<2k<n, are critical points for a certain Hilbert type functional with respect to volume preserving conformal variations. This motivates the corresponding Yamabe problem: is it true that any metric on a closed manifold is conformal to a metric with constant 2k-Gauss-Bonnet curvature? Using perturbative methods we affirmatively answer this question for small perturbations of certain space forms. More precisely, if (X,g) is a non-flat closed space form not isometric to a round sphere, we show the existence of a neighborhood U, of g, in the space of metrics such that any g' in U is conformal to a metric whose 2k-Gauss-Bonnet curvature is constant.
math.DG↗
Deformations of 2k-Einstein structures
It is shown that the space of infinitesimal deformations of 2k-Einstein structures is finite dimensional at compact non-flat space forms. Moreover, spherical space forms are shown to be rigid in the sense that they are isolated in the corresponding moduli space.
math.DG↗