Session 35. Topological fixed point theory and related topics

Holonomy groups of flat manifolds with \(R_\infty\) property

Rafał Lutowski, University of Gdańsk, Poland
The talk is based on the joint work with Andrzej Szczepański
Let \(M\) be a closed Riemannian manifold. We say that \(M\) has the \(R_\infty\) property if for every homeomorphism \(f \colon M \to M\) the Reidemeister number \(R(f)\) is equal to \(\infty\). \(M\) is flat if, at any point, its sectional curvature is equal to zero. We investigate a relation between the holonomy representation \(\rho\) of a flat manifold \(M\) and the \(R_\infty\) property of \(M\). In particular we consider the case where the holonomy group of \(M\) is solvable. We show that if \(\rho\) has - in a given sense unique - \(\mathbb{R}\)-irreducible subrepresentation of odd degree, then \(M\) has the \(R_\infty\) property. The result is related to Conjecture 4.8 from [1].
References
  1. K. Dekimpe, B. De Rock, P. Penninckx, The \(R_\infty\) property for infra-nilmanifolds , Topol. Methods Nonlinear Anal. 34 (2009), no.2, 353-373
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