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arXiv · 2311.01116

Free fermionic probability theory and K-theoretic Schubert calculus

Shinsuke Iwao·Kohei Motegi·Travis Scrimshaw
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Abstract

For each of the four particle processes given by Dieker and Warren [arXiv:0707.1843], we show the $n$-step transition kernels are given by the (dual) (weak) refined symmetric Grothendieck functions up to a simple overall factor. We do so by encoding the particle dynamics as the basis of free fermions first introduced by the first author, which we translate into deformed Schur operators acting on partitions. We provide a direct combinatorial proof of this relationship in each case, where the defining tableaux naturally describe the particle motions.

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Shinsuke Iwao, Kohei Motegi, Travis Scrimshaw. 2023-11-02. Free fermionic probability theory and K-theoretic Schubert calculus. https://doi.org/10.1017/fms.2025.10146

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