Equivariant Seiberg–Witten and Heegaard Floer contact invariants for branched covers

Let KK be a transverse knot in S3S^3, let Σ2(K)\Sigma_2(K) be its double branched cover, and let ξ~\widetilde{\xi} be the induced contact structure. Let

H~Z2(SWF(Σ2(K));F2)\widetilde{H}^{\mathbb{Z}_2}_*(SWF(\Sigma_2(K));\mathbb{F}_2)

and

HFZ2(Σ2(K);F2)HF^{\mathbb{Z}_2}_*(\Sigma_2(K);\mathbb{F}_2)

be the corresponding equivariant Seiberg–Witten Floer and Heegaard Floer homology groups, viewed as Z2[Q]\mathbb{Z}_2[Q]-modules, and let c2(S3,ξstd,K)c_2(S^3,\xi_{\operatorname{std}},K) and cZ2(ξ~)c_{\mathbb{Z}_2}(\widetilde{\xi}) be the associated contact invariants. The equivariant contact-invariant comparison conjecture. There is a functorial isomorphism

Ψ:H~Z2(SWF(Σ2(K));F2)HFZ2(Σ2(K);F2)\Psi:\widetilde{H}^{\mathbb{Z}_2}_*(SWF(\Sigma_2(K));\mathbb{F}_2)\longrightarrow HF^{\mathbb{Z}_2}_*(\Sigma_2(K);\mathbb{F}_2)

of Z2[Q]\mathbb{Z}_2[Q]-modules such that

Ψ(c2(S3,ξstd,K))=cZ2(ξ~).\Psi\bigl(c_2(S^3,\xi_{\operatorname{std}},K)\bigr)=c_{\mathbb{Z}_2}(\widetilde{\xi}).

This would identify the Seiberg–Witten and Heegaard Floer equivariant contact classes for branched covers; the source gives no resolution evidence.

Sources & referencesView supporting material

Primary source

Nobuo Iida and Masaki Taniguchi, “Monopoles and transverse knots”, arXiv:2403.15763 (2024).

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