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Mirror symmetry for certain blowups of Grassmannians

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arxiv 2502.13545 v1 pith:WMQQT2VC submitted 2025-02-19 math.AG

classification math.AG
keywords blowupalongmirrorringsymmetrywhenalmostblowups
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abstract

We classify when the blowup of a complex Grassmannian $G(k, n)$ along a smooth Schubert subvariety $Z$ is Fano. We compute almost all the two-point, genus zero Gromov-Witten invariants of the blowup when $Z=G(k, n-1)$. We further prove a mirror symmetry statement for the blowup $X_{2, n}$ of $G(2, n)$ along $G(2, n-1)$, by introducing a toric superpotential $f_{\rm tor}$ and showing the isomorphism between the Jacobi ring of $f_{\rm tor}$ and the small quantum cohomology ring $QH^*(X_{2, n})$.

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  1. Quantum Schubert calculus for smooth Schubert divisors of $F\ell_n$

    math.AG 2025-09 conditional novelty 7.0 of 10

    The quantum cohomology of the smooth Schubert divisor X_{w0 s_{n-1}} in Fl_n is presented, with a quantum Chevalley formula and quantum Schubert polynomials identical to those of Fl_n.

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