Non-loose realizations from non-zero hat Legendrian invariants

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Let L↪YL\hookrightarrow Y be an nn-component link admitting a Legendrian realization L\mathcal L in (Y,ξ)(Y,\xi) with non-zero L^⁡(L)\operatorname{\widehat{\mathfrak{L}}}(\mathcal L). Then there is a non-loose realization M\mathcal M of LL in an overtwisted structure η\eta on YY such that

tη=tξ∈Spinc⁡(Y)\mathfrak t_\eta=\mathfrak t_\xi\in\operatorname{Spin^c}(Y)

and

d3(η)=d3(ξ)−2A(L^⁡(L))+n.d_3(\eta)=d_3(\xi)-2A\bigl(\operatorname{\widehat{\mathfrak{L}}}(\mathcal L)\bigr)+n.

Non-loose realization conjecture. If the hat Legendrian invariant of a Legendrian realization is non-zero, then the construction produces a non-loose realization in an overtwisted contact structure with the stated Spinc⁡\operatorname{Spin^c} and d3d_3 invariants. The preceding discussion notes that the corresponding case for taut foliations is confirmed, while the general assertion is presented as an expectation and remains open.

References

Primary source

Alberto Cavallo and Irena Matkovič, “Legendrian invariants and half Giroux torsion”, arXiv:2310.07593 (2023).

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