Stanley–Reisner-type degeneration conjecture for loop-model schemes

Let ρ\rho be a link pattern, let D\mathcal D be a diagram of ρ\rho, let LρL_\rho be the associated scheme, and let Lρ,πL_{\rho,\pi} denote its fixed-connectivity part for a connectivity π\pi. For every crossing i<j<ρ(i)<ρ(j)i<j<\rho(i)<\rho(j) of ρ\rho, the relevant component is described by the equations Mi,j=0M_{i,j}=0 and Mj,ρ(i)=0M_{j,\rho(i)}=0. Loop-model degeneration conjecture. There exists a (partial) Gröbner TρT_\rho-equivariant degeneration of LρL_\rho into an in-general-unreduced scheme whose components are indexed by noncrossing loop configurations of D\mathcal D, with the components coming from Lρ,πL_{\rho,\pi} indexed by loop configurations of connectivity π\pi; each geometric component is given by the stated equations and has multiplicity 2loops2^{|\text{loops}|}. The conjecture refines the expected Stanley–Reisner degeneration by allowing nonreduced components, whose multiplicities account for the loop weight. The supplied text gives no resolution, so it remains open.

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Primary source

Paul Zinn-Justin, “Loop Models and K-Theory”, arXiv:1612.05361 (2018).

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