English

Homotopy type of manifolds with partially horoconvex boundary

Differential Geometry 2018-09-20 v1

Abstract

Let MM be an nn-dimensional compact connected manifold with boundary, κ>0\kappa>0 a constant and 1qn11\leq q\leq n-1 an integer. We prove that MM supports a Riemannian metric with the interior qq-curvature Kqqκ2K_q\geq -q\kappa^2 and the boundary qq-curvature Λqqκ\Lambda_q\geq q\kappa, if and only if MM has the homotopy type of a CW complex with a finite number of cells with dimension (q1)\leq (q-1). Moreover, any Riemannian manifold MM with sectional curvature Kκ2K\geq -\kappa^2 and boundary principal curvature Λκ\Lambda\geq \kappa is diffeomorphic to the standard closed nn-ball.

Keywords

Cite

@article{arxiv.1809.06982,
  title  = {Homotopy type of manifolds with partially horoconvex boundary},
  author = {Changwei Xiong},
  journal= {arXiv preprint arXiv:1809.06982},
  year   = {2018}
}

Comments

11 pages; accepted by Internat. J. Math