Takumi Otani
Published 2024-11-05Version 1
For a generalized root system of affine ADE type, we introduce a twist automorphism. We prove that the Dubrovin-Zhang extended affine Weyl group is isomorphic to our (modified) extended affine Weyl group, which is an extension of the affine Weyl group by the twist automorphism. We also show that the number of root bases with a Coxeter transformation modulo the twist automorphism is equal to the degree of the Lyashko-Looijenga map of the Frobenius manifold constructed by Dubrovin-Zhang. As analogues of the extended affine Weyl group, we define an extended Artin group and an extended Seidel-Thomas braid group. We study the relationship between the extended affine Weyl group and the extended Seidel-Thomas braid group.
Q-Systems, Factorization Dynamics, and the Twist Automorphism
The convolution algebra structure on $K^G(\mathcal{B} \times \mathcal{B})$
Determining whether certain affine Deligne-Lusztig sets are empty
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