Volume 22, issue 3 (2018)

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Orderability and Dehn filling

Marc Culler and Nathan M Dunfield

Geometry & Topology 22 (2018) 1405–1457
Abstract

Motivated by conjectures relating group orderability, Floer homology and taut foliations, we discuss a systematic and broadly applicable technique for constructing left-orders on the fundamental groups of rational homology $3$–spheres. Specifically, for a compact $3$–manifold $M$ with torus boundary, we give several criteria which imply that whole intervals of Dehn fillings of $M$ have left-orderable fundamental groups. Our technique uses certain representations from ${\pi }_{1}\left(M\right)$ into $\stackrel{˜}{{PSL}_{2}ℝ}$, which we organize into an infinite graph in ${H}^{1}\left(\partial M;ℝ\right)$ called the translation extension locus. We include many plots of such loci which inform the proofs of our main results and suggest interesting avenues for future research.

Keywords
orderable groups, Dehn filling
Mathematical Subject Classification 2010
Primary: 57M60
Secondary: 57M25, 57M05, 20F60