Gorenstein-injective realization conjecture for positroid categories

Let votin\quotmaxv otin\quotmax and wvw\geq v, let b1aσ=v1wb1a\sigma=v^{-1}w be the resulting permutation decorated by declaring a fixed index jj black if jv1[k]j\in v^{-1}[k], and set I=v1[k]I=v^{-1}[k]. Let BI(σ)=iMIiB_{\mathcal{I}(\sigma)}=\bigoplus_i M_{I_i}, and let \gi(BI(σ))\gi(B_{\mathcal{I}(\sigma)}) denote the category of Gorenstein-injective objects defined by Ext1(BI(σ),M)=0\operatorname{Ext}^1(B_{\mathcal{I}(\sigma)}^{\vee},M)=0. With πI\pi_I the functor to the positroid module category, the Gorenstein-injective realization conjecture.

add(πI(\gi(BI(σ))))=\lecvw.\operatorname{add}\bigl(\pi_I(\gi(B_{\mathcal{I}(\sigma)}))\bigr)=\lec v w.

This predicts that the additive closure of the projected Gorenstein-injective category recovers the category associated with the interval from vv to ww. The source presents this as an open conjecture connecting decorated permutations, necklaces, and categories attached to positroid varieties.

Sources & referencesView supporting material

Primary source

Liam Riordan, “Cohen Macaulay modules and positroid varieties”, arXiv:2606.15401 (2026).

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