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JOURNALS // Symmetry, Integrability and Geometry: Methods and Applications // Archive

SIGMA, 2025 Volume 21, 006, 17 pp. (Mi sigma2123)

Positive Intermediate Ricci Curvature on Fibre Bundles

Philipp Reisera, David J. Wraithb

a Department of Mathematics, University of Fribourg, Switzerland
b Department of Mathematics and Statistics, National University of Ireland Maynooth, Maynooth, County Kildare, Ireland

Abstract: We prove a canonical variation-type result for submersion metrics with positive intermediate Ricci curvatures. This can then be used in conjunction with surgery techniques to establish the existence of metrics with positive intermediate Ricci curvatures on a wide range of examples which had previously only been known to admit positive Ricci curvature, such as highly connected manifolds and exotic spheres. Further, we extend results of the second author on the moduli space of metrics with positive Ricci curvature to positive intermediate Ricci curvatures.

Keywords: positive intermediate Ricci curvature, fibre bundle, plumbing, homotopy sphere, moduli space.

MSC: 53C20

Received: August 15, 2024; in final form January 20, 2025; Published online January 23, 2025

Language: English

DOI: 10.3842/SIGMA.2025.006


ArXiv: 2211.14610


© Steklov Math. Inst. of RAS, 2025