Decomposability threshold conjecture for Legendrian doubles

Let λ\lambda be a Legendrian link such that M1(λ)\mathcal{M}_1(\lambda) has a cluster structure. Let L1L_1 and L2L_2 be exact Lagrangian fillings of λ\lambda, and let dμ(L1,L2)d_\mu(L_1,L_2) be their mutation distance. Let Λ(L1,L2)\Lambda(L_1,L_2) be their Legendrian double. Decomposability-threshold conjecture. There exists an NN such that

dμ(L1,L2)>Nd_\mu(L_1,L_2)>N

implies that Λ(L1,L2)\Lambda(L_1,L_2) is not decomposable. This generalizes the paper's result for trivalent graph fillings of λ(2,n)\lambda(2,n), where sufficiently large mutation distance obstructs decomposability; the general statement remains open.

Sources & referencesView supporting material

Primary source

James Hughes and Agniva Roy, “Legendrian doubles, twist spuns, and clusters”, arXiv:2505.17901 (2025).

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