Volume 23, issue 2 (2019)

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On homology cobordism and local equivalence between plumbed manifolds

Irving Dai and Matthew Stoffregen

Geometry & Topology 23 (2019) 865–924
Abstract

We establish a structural understanding of the involutive Heegaard Floer homology for all linear combinations of almost-rational (AR) plumbed three-manifolds. We use this to show that the Neumann–Siebenmann invariant is a homology cobordism invariant for all linear combinations of AR plumbed homology spheres. As a corollary, we prove that if $Y$ is a linear combination of AR plumbed homology spheres with $\mu \left(Y\right)=1$, then $Y$ is not torsion in the homology cobordism group. A general computation of the involutive Heegaard Floer correction terms for these spaces is also included.

Keywords
involutive Heegaard Floer homology, homology cobordism
Primary: 57R58
Secondary: 57M27