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Lattice cohomology and q-series invariants of 3-manifolds

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arxiv 2109.14139 v2 pith:FZB6YJIW submitted 2021-09-29 math.GT

Lattice cohomology and $q$-series invariants of $3$-manifolds

classification math.GT
keywords manifoldscohomologygivesinvariantinvariantslatticeplumbedseries
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abstract

An invariant is introduced for negative definite plumbed $3$-manifolds equipped with a spin$^c$-structure. It unifies and extends two theories with rather different origins and structures. One theory is lattice cohomology, motivated by the study of normal surface singularities, known to be isomorphic to the Heegaard Floer homology for certain classes of plumbed 3-manifolds. Another specialization gives BPS $q$-series which satisfy some remarkable modularity properties and recover ${\rm SU}(2)$ quantum invariants of $3$-manifolds at roots of unity. In particular, our work gives rise to a $2$-variable refinement of the $\widehat Z$-invariant.

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  1. Quantum invariants of 3-manifolds and links: a review

    math-ph 2025-09 unverdicted novelty 1.0

    This is a survey, not a new result: it reviews the q-series invariants Zhat, F_K, F_L and their supergroup analogues, collecting known conjectures, theorems, and examples.