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math.GT2026
Free circle actions and positive Ricci curvature on manifolds with the cohomology ring of
Philipp Reiser
We classify which of the 672 oriented diffeomorphism types of closed, simply-connected spin 7-manifolds with the cohomology ring of admit a free circle action. In a…
math.GT2025
Free torus actions and twisted suspensions
Fernando Galaz-GarcÃa, Philipp Reiser
We express the total space of a principal circle bundle over a connected sum of two manifolds in terms of the total spaces of circle bundles over each summand, provided certain con…