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Cluster structures on schemes of bands

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arxiv 2504.14012 v2 pith:L7GHECPW submitted 2025-04-18 math.RT math.QAmath.RA

Cluster structures on schemes of bands

classification math.RT math.QAmath.RA
keywords clusteraffinebandssub-algebrasalgebrasgroupquantumring
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We introduce new objects, called $(G,c)$-bands, associated with a simple simply-connected algebraic group $G$, and a Coxeter element $c$ in its Weyl group. We show that bands of a given type are the $K$-points of an infinite dimensional affine scheme, whose ring of regular functions has a cluster algebra structure. We also show that two important invariant sub-algebras of this ring are cluster sub-algebras. These three cluster structures have already appeared in different contexts related to the representation theories of quantum affine algebras, their Borel sub-algebras, and shifted quantum affine algebras. In this paper we show that they all belong to a common geometric setting.

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Cited by 2 Pith papers

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  1. Category $\mathcal{O}$ for truncated shifted Yangians and the bi-infinite Bott-Samelson variety

    math.RT 2026-07 accept novelty 8.0

    The complexified Grothendieck ring of integral category O for truncated shifted Yangians is isomorphic to the Cox ring of the open bi-infinite Bott-Samelson variety, proving the Hernandez-Zhang conjecture and related ...

  2. Category $\mathcal{O}$ for truncated shifted Yangians and the bi-infinite Bott-Samelson variety

    math.RT 2026-07 conditional novelty 8.0

    The Grothendieck ring of integral category O for shifted Yangians equals the Cox ring of a new open bi-infinite Bott-Samelson pro-variety, proving the Hernandez-Zhang and Frenkel-Hernandez/GHL conjectures in simply-la...