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Loop structure on equivariant $K$-theory of semi-infinite flag manifolds

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arxiv 1805.01718 v9 pith:72TE5Z5L submitted 2018-05-04 math.AG math.QAmath.RT

classification math.AGmath.QAmath.RT
keywords equivariantflaggroupstructuremanifoldsemi-infiniteconsideredisomorphism
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abstract

We explain that the Pontryagin product structure on the equivariant $K$-group of an affine Grassmannian considered in [Lam-Schilling-Shimozono, Compos. Math. {\bf 146} (2010)] coincides with the tensor structure on the equivariant $K$-group of a semi-infinite flag manifold considered in [K-Naito-Sagaki, Duke Math. {\bf 169} (2020)]. Then, we construct an explicit isomorphism between the equivariant $K$-group of a semi-infinite flag manifold with a suitably localized equivariant quantum $K$-group of the corresponding flag manifold. These exhibit a new framework to understand the ring structure of equivariant quantum $K$-theory and the Peterson isomorphism.

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Cited by 2 Pith papers

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

  1. Towards small quantum Chern character

    math.AG 2025-07 conditional novelty 7.0 of 10

    A quantum Chern character ring homomorphism is constructed for projective spaces and incidence varieties, and a new presentation of small quantum K-theory of Milnor hypersurfaces is proved.

  2. Quantum K-theory levels in physics and math

    hep-th 2025-06 conditional novelty 6.0 of 10

    Chern-Simons levels and Ruan-Zhang levels are identified as the same twisting of quantum K-theory, with Coulomb branch equations matching difference operator symbols and geometric windows matching mirror triviality.

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