Exotic Lagrangian tori in Grassmannians

  • Marco Castronovo

    Columbia University, New York, USA
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We describe an iterative construction of Lagrangian tori in the complex Grassmannian , based on the cluster algebra structure of the coordinate ring of a mirror Landau–Ginzburg model proposed by Marsh and Rietsch (2020). Each torus comes with a Laurent polynomial, and local systems controlled by the -variables Schur polynomials at the -th roots of unity. We use this data to give examples of monotone Lagrangian tori that are neither displaceable nor Hamiltonian isotopic to each other, and that support nonzero objects in different summands of the spectral decomposition of the Fukaya category over .

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Marco Castronovo, Exotic Lagrangian tori in Grassmannians. Quantum Topol. 14 (2023), no. 1, pp. 65–99

DOI 10.4171/QT/173