Papers › Towards Landau-Ginzburg models for cominuscule spaces via the exceptional cominuscule family
Towards Landau-Ginzburg models for cominuscule spaces via the exceptional cominuscule family
Peter Spacek, Charles Wang
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We present projective Landau-Ginzburg models for the exceptional cominuscule homogeneous spaces 𝕆ℙ² = E₆ˢᶜ/P₆ and E₇ˢᶜ/P₇, known respectively as the Cayley plane and the Freudenthal variety. These models are defined on the complement X^∨_(can) of an anti-canonical divisor of the "Langlands dual homogeneous spaces" 𝕏^∨ = P^∨\G^∨ in terms of generalized Pl\"ucker coordinates, analogous to the canonical models defined for Grassmannians, quadrics and Lagrangian Grassmannians in arXiv:1307.1085, arXiv:1404.4844, arXiv:1304.4958. We prove that these models for the exceptional family are isomorphic to the Lie-theoretic mirror models defined in arXiv:math/0511124 using a restriction to an algebraic torus, also known as the Lusztig torus, as proven in arXiv:1912.09122. We also give a cluster structure on ℂ[𝕏^∨], prove that the Pl\"ucker coordinates form a Khovanskii basis for a valuation defined using the Lusztig torus, and compute the Newton-Okounkov body associated to this valuation. Although we present our methods for the exceptional types, they generalize immediately to the members of other cominuscule families.
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