Non-loose realizations from non-zero hat Legendrian invariants

Let LYL\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=tξSpinc(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.

Sources & referencesView supporting material

Primary source

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

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