Quantum cluster variables via vanishing cycles
arXiv:1112.3601
Abstract
In this paper, we provide a Hodge-theoretic interpretation of Laurent phenomenon for general skew-symmetric quantum cluster algebras, using Donaldson-Thomas theory for a quiver with potential. It turns out that the positivity conjecture reduces to the certain statement on purity of monodromic mixed Hodge structures on the cohomology with the coefficients in the sheaf of vanishing cycles on the moduli of stable framed representations. As an application, we show that the positivity conjecture (and actually a stronger result on Lefschetz property) holds if either initial or mutated quantum seed is acyclic. For acyclic initial seed the positivity has been already shown by F. Qin \cite{Q} in the quantum case, and also by Nakajima \cite{Nak} in the commutative case.
46 pages, no figures; references added, introduction expanded
References in corpus (4)
Cited by in corpus (15)
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- The critical CoHA of a quiver with potential
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- The existence of greedy bases in rank 2 quantum cluster algebras
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- Purity of critical cohomology and Kac's conjecture
- On the existence of scaling multi-centered black holes
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