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Categorified canonical bases and framed BPS states

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Abstract

We consider a cluster variety associated to a triangulated surface without punctures. The algebra of regular functions on this cluster variety possesses a canonical vector space basis parametrized by certain measured laminations on the surface. To each lamination, we associate a graded vector space, and we prove that the graded dimension of this vector space gives the expansion in cluster coordinates of the corresponding basis element. We discuss the relation to framed BPS states in \({\mathcal {N}}=2\) field theories of class \({\mathcal {S}}\).

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Acknowledgements

In writing this paper, I have benefitted from conversations with many people, including Tom Bridgeland, Michele Cirafici, Michele Del Zotto, Joseph Karmazyn, Daniel Labardini-Fragoso, Sven Meinhardt, Andrew Neitzke, Harold Williams, and Yu Zhou.

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  1. Mathematical Sciences Research Institute, Berkeley, USA

    Dylan G. L. Allegretti

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Allegretti, D.G.L. Categorified canonical bases and framed BPS states. Sel. Math. New Ser. 25, 69 (2019). https://doi.org/10.1007/s00029-019-0518-3

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