Geodesic
An equivariant quantum Pieri rule for the Grassmannian on cylindric shapes
The electronic journal of combinatorics, Tome 29 (2022) no. 2
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The quantum cohomology ring of the Grassmannian is determined by the quantum Pieri rule for multiplying by Schubert classes indexed by row or column-shaped partitions. We provide a direct equivariant generalization of Postnikov's quantum Pieri rule for the Grassmannian in terms of cylindric shapes, complementing related work of Gorbounov and Korff in quantum integrable systems. The equivariant terms in our Graham-positive rule simply encode the positions of all possible addable boxes within one cylindric skew diagram. As such, unlike the earlier equivariant quantum Pieri rule of Huang and Li and known equivariant quantum Littlewood-Richardson rules, our formula does not require any calculations in a different Grassmannian or two-step flag variety.
DOI : 10.37236/10015
Classification : 14N35, 14N15, 14M15

Anna Bertiger    ; Dorian Ehrlich    ; Elizabeth Milićević  1   ; Kaisa Taipale 

1 Haverford College 
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     title = {An equivariant quantum {Pieri} rule for the {Grassmannian} on cylindric shapes},
     journal = {The electronic journal of combinatorics},
     year = {2022},
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Anna Bertiger; Dorian Ehrlich; Elizabeth Milićević; Kaisa Taipale. An equivariant quantum Pieri rule for the Grassmannian on cylindric shapes. The electronic journal of combinatorics, Tome 29 (2022) no. 2. doi: 10.37236/10015

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