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