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arXiv · 2509.11756

Fusion in the periodic Temperley-Lieb algebra: general definition of a bifunctor

Yacine Ikhlef·Alexi Morin-Duchesne
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Abstract

The periodic Temperley-Lieb category consists of connectivity diagrams drawn on a ring with $N$ and $N'$ nodes on the outer and inner boundary, respectively. We consider families of modules, namely sequences of modules $\mathsf{M}(N)$ over the enlarged periodic Temperley-Lieb algebra for varying values of $N$, endowed with an action $\mathsf{M}(N') \to \mathsf{M}(N)$ of the diagrams. Examples of modules that can be organised into families are those arising in the RSOS model and in the XXZ spin-$\frac12$ chain, as well as several others constructed from link states. We construct a fusion product which outputs a family of modules from any pair of families. Its definition is inspired from connectivity diagrams drawn on a disc with two holes. It is thus defined in a way to describe intermediate states in lattice correlation functions. We prove that this fusion product is a bifunctor, and that it is distributive, commutative, and associative.

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Yacine Ikhlef, Alexi Morin-Duchesne. 2025-09-15. Fusion in the periodic Temperley-Lieb algebra: general definition of a bifunctor. https://doi.org/10.21468/scipostphyscore.9.3.053

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