%ASerhiyenko, K. [Department of Mathematics University of California at Berkeley Berkeley CA 94720 USA]%ASerhiyenko, K. [Department of MathematicsUniversity of California at BerkeleyBerkeley CA 94720 USA]%ASherman‐Bennett, M. [Department of Mathematics University of California at Berkeley Berkeley CA 94720 USA]%ASherman‐Bennett, M. [Department of MathematicsUniversity of California at BerkeleyBerkeley CA 94720 USA]%AWilliams, L. [Department of Mathematics Harvard University Cambridge MA 02138 USA]%AWilliams, L. [Department of MathematicsHarvard UniversityCambridge MA 02138 USA]%BJournal Name: Proceedings of the London Mathematical Society; Journal Volume: 119; Journal Issue: 6; Related Information: CHORUS Timestamp: 2023-08-17 05:06:22 %D2019%IOxford University Press (OUP) %JJournal Name: Proceedings of the London Mathematical Society; Journal Volume: 119; Journal Issue: 6; Related Information: CHORUS Timestamp: 2023-08-17 05:06:22 %K %MOSTI ID: 10114439 %PMedium: X %TCluster structures in Schubert varieties in the Grassmannian %XAbstract

In this article we explain how the coordinate ring of each (open) Schubert variety in the Grassmannian can be identified with a cluster algebra, whose combinatorial structure is encoded using (target labelings of) Postnikov'splabic graphs. This result generalizes a theorem of Scott [Proc. Lond. Math. Soc. (3) 92 (2006) 345–380] for the Grassmannian, and proves a folklore conjecture for Schubert varieties that has been believed by experts since Scott's result [Proc. Lond. Math. Soc. (3) 92 (2006) 345–380], though the statement was not formally written down until Muller–Speyer explicitly conjectured it [Proc. Lond. Math. Soc. (3) 115 (2017) 1014–1071]. To prove this conjecture we use a result of Leclerc [Adv. Math. 300 (2016) 190–228] who used the module category of the preprojective algebra to prove that coordinate rings of many Richardson varieties in the complete flag variety can be identified with cluster algebras. Our proof also uses a construction of Karpman [J. Combin. Theory Ser. A142 (2016) 113–146] to build plabic graphs associated to reduced expressions. We additionally generalize our result to the setting of skew‐Schubert varieties; the latter result usesgeneralizedplabic graphs, that is, plabic graphs whose boundary vertices need not be labeled in cyclic order.

%0Journal Article