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Equivariant $K$-homology of affine Grassmannian and $K$-theoretic double $k$-Schur functions

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arxiv 2408.10956 v1 pith:PZK7NEZD submitted 2024-08-20 math.RT math.AGmath.COmath.KT

classification math.RTmath.AGmath.COmath.KT
keywords functionsequivariantringaffinedoublegrassmanniank-homologymathrm
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abstract

We study the torus equivariant K-homology ring of the affine Grassmannian $\mathrm{Gr}_G$ where $G$ is a connected reductive linear algebraic group. In type $A$, we introduce equivariantly deformed symmetric functions called the K-theoretic double $k$-Schur functions as the Schubert bases. The functions are constructed by Demazure operators acting on equivariant parameters. As an application, we provide a Ginzburg-Peterson type realization of the torus-equivariant K-homology ring of $\mathrm{Gr}_{{SL}_n}$ as the coordinate ring of a centralizer family for $PGL_n(\mathbb{C})$.

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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Relativistic Toda Lattice and Equivariant $K$-Homology of Affine Grassmannian

    math.RT 2025-05 conditional novelty 7.0 of 10

    The authors explicitly realize the equivariant K-Peterson map for SL_n by a rational substitution and prove a factorization formula for K-theoretic double k-Schur functions.

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