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

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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 2∣loops∣2^{|\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.

References

Primary source

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

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