MURAL - Maynooth University Research Archive Library



    Intermediate curvatures and highly connected manifolds


    Crowley, Diarmuid and Wraith, David (2022) Intermediate curvatures and highly connected manifolds. Asian Journal of Mathematics, 26 (3). pp. 407-454. ISSN 1093-6106

    [thumbnail of DW_inter.pdf]
    Preview
    Text
    DW_inter.pdf

    Download (446kB) | Preview

    Abstract

    We show that after forming a connected sum with a homotopy sphere, all (2j-1)-connected 2j-parallelisable manifolds in dimension 4j+1, j > 0, can be equipped with Riemannian metrics of 2-positive Ricci curvature. When j=1 we extend the above to certain classes of simply-connected non-spin 5-manifolds. The condition of 2-positive Ricci curvature is defined to mean that the sum of the two smallest eigenvalues of the Ricci tensor is positive at every point. This result is a counterpart to a previous result of the authors concerning the existence of positive Ricci curvature on highly connected manifolds in dimensions 4j-1 for j > 1, and in dimensions 4j+1 for j > 0 with torsion-free cohomology. A key technical innovation involves performing surgery on links of spheres within 2-positive Ricci curvature.
    Item Type: Article
    Keywords: Intermediate curvatures; highly connected; manifolds;
    Academic Unit: Faculty of Science and Engineering > Mathematics and Statistics
    Item ID: 18507
    Identification Number: 10.4310/ajm.2022.v26.n3.a3
    Depositing User: Dr. David Wraith
    Date Deposited: 14 May 2024 11:11
    Journal or Publication Title: Asian Journal of Mathematics
    Publisher: International Press
    Refereed: Yes
    Related URLs:
    URI: https://mu.eprints-hosting.org/id/eprint/18507
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

    Repository Staff Only (login required)

    Item control page
    Item control page

    Downloads

    Downloads per month over past year

    Origin of downloads