The P=WP=W conjecture for positroid torus quotients and compactified Jacobians

Let \Pitk,n\Pit_{k,n} be the torus quotient and let Jk,nkJ_{k,n-k} be the compactified Jacobian of the plane curve singularity xk=ynkx^k=y^{n-k}. Their cohomology carries a weight filtration and a perverse filtration, respectively. The P=WP=W conjecture. There is a deformation retraction from \Pitk,n\Pit_{k,n} to Jk,nkJ_{k,n-k} sending the weight filtration of H(\Pitk,n)H^\bullet(\Pit_{k,n}) to the perverse filtration of H(Jk,nk)H^\bullet(J_{k,n-k}). This conjecture is motivated by the relationship between compactified Jacobians, positroid varieties, and knot invariants, and arises from the P=WP=W phenomena studied for character varieties. The supplied text does not indicate whether this particular statement has been resolved.

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Primary source

Pavel Galashin and Thomas Lam, “Positroids, knots, and q,t-Catalan numbers”, arXiv:2012.09745 (2023).

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