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Frobenius manifolds and a new class of extended affine Weyl groups $\widetilde{W}^{(k,k+1)}(A_l)$

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arxiv 1905.09470 v2 pith:B7GTWCXQ submitted 2019-05-22 math.DG math-phmath.MPnlin.SI

classification math.DGmath-phmath.MPnlin.SI
keywords frobeniuswidetildeaffineclassextendedgroupsmanifoldstructures
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abstract

We present a new class of extended affine Weyl groups $\widetilde{W}^{(k,k+1)}(A_l)$ for $1\leq k <l$ and obtain an analogue of Chevalley-type theorem for their invariants. We further show the existence of Frobenius manifold structures on the orbit spaces of $\widetilde{W}^{(k,k+1)}(A_l)$ and also construct Landau--Ginzburg superpotentials for these Frobenius manifold structures.

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  1. Rank shift conditions and reductions of 2d-Toda theory

    nlin.SI 2019-08 conditional novelty 7.0 of 10

    Imposing rank-one and rank-two shift conditions on symmetric and skew-symmetric moment matrices yields the C-Toda and B-Toda hierarchies with explicit Lax matrices, and shows the Pfaff lattice is the large BKP hierarchy.

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