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arXiv · 2605.00346

Aspherical $PD_3$-pairs

Jonathan A. Hillman
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Abstract

We extend two results known for aspherical 3-manifolds to $PD_3$-pairs $(P,\partial{P})$ with aspherical ambient space $P$. Every such $PD_3$-pair may be assembled by attaching 1-handles to $PD_3$-pairs with aspherical; ambient space and $\pi_1$-injective boundary. (Thus the study of such pairs reduces to the study of $PD_3$-pairs of groups.) If $\pi$ is a group of type $FP$ whose indecomposable factors $G$ each have $\chi(G_i)=0$ then there are only finitely many such $PD_3$-pairs with $\pi_1(P)\cong\pi$.

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Jonathan A. Hillman. 2026-05-01. Aspherical $PD_3$-pairs. https://arxiv.org/abs/2605.00346

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