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arxiv: 0812.0667 · v3 · submitted 2008-12-03 · 🧮 math.QA · math.RT

Periodicities of T-systems and Y-systems

classification 🧮 math.QA math.RT
keywords algebraconjecturemethodrestrictedt-systemcategoryclusterpartially
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The unrestricted T-system is a family of relations in the Grothendieck ring of the category of the finite-dimensional modules of the Yangian or the quantum affine algebra associated with a complex simple Lie algebra. The unrestricted T-system admits a reduction called the restricted T-system. In this paper we formulate the periodicity conjecture for the restricted T-systems, which is the counterpart of the known and partially proved periodicity conjecture for the restricted Y-systems. Then, we partially prove the conjecture by various methods: the cluster algebra and cluster category method for the simply laced case, the determinant method for types A and C, and the direct method for types A, D, and B (level 2).

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