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arXiv · 2508.19066

An introduction to $(G,c)$-bands

Luca Francone·Bernard Leclerc
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Abstract

We give an introduction to our results on cluster structures for schemes of $(G,c)$-bands emphasizing their connections with seminal works of Frenkel and Reshetikhin in the 90's. In particular we construct using $(G,c)$-bands a discrete analogue of the difference Miura transformation of the loop group $LG$, and we show that it calculates the $q$-characters of the finite-dimensional representations of the quantum affine algebra $U_q(\widehat{\mathfrak{g}})$ of the same $A$, $D$, $E$ type as $G$, thus verifying a conjecture of Frenkel and Reshetikhin.

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Luca Francone, Bernard Leclerc. 2026-06-30. An introduction to $(G,c)$-bands. https://arxiv.org/abs/2508.19066

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