Cluster algebras and Weil-Petersson forms

Details Cluster algebras and Weil-Petersson forms Cluster algebras and Weil-Petersson forms

2003-09-08

arxiv.org/abs/math/0309138v2

Mathematics

Quantum Algebra

17 pages, 7 figures; Substantial changes: new proof of Theorem 3.3. Corrected formulation and new proof of Theorem 3.4. Some o

Scientific paper

In our previous paper we have discussed Poisson properties of cluster algebras of geometric type for the case of a nondegenerate matrix of transition exponents. In this paper we consider the case of a general matrix of transition exponents. Our leading idea that a relevant geometric object in this case is a certain closed 2-form compatible with the cluster algebra structure. The main example is provided by Penner coordinates on the decorated Teichmueller space, in which case the above form coincides with the classic Weil-Petersson symplectic form.

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