The pillowcase perturbation conjecture for 2-tangle character varieties

Let (Y,T)(Y,T) be a 2-tangle in the 3-ball or in a homology 3-ball. Write Rπ(Y,T)R_\pi(Y,T) for the perturbed traceless character variety and let

L1:Rπ(Y,T)R(S2,{a,b,c,d})L_1:R_\pi(Y,T)\to R(S^2,\{a,b,c,d\})

be its restriction map. A pillowcase perturbation conjecture asserts that there exist arbitrarily small holonomy perturbations π\pi such that Rπ(Y,T)R_\pi(Y,T) is a compact 11-manifold with two boundary points and L1L_1 is a restricted immersed 11-manifold on each component in the sense of the paper's definition. This would make the Lagrangian-Floer construction applicable to arbitrary 2-tangles, whereas the claim is presently supported by results for particular families and examples but remains unproved in general.

Sources & referencesView supporting material

Primary source

Matthew Hedden, Christopher M. Herald and Paul Kirk, “The pillowcase and traceless representations of knot groups II: a Lagrangian-Floer theory in the pillowcase”, arXiv:1501.00028 (2014).

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