Quiver BPS Indices from Crystal Profiles
2026/07/03 by Jiakang Bao, Masahito Yamazaki · 1 voice
Physics and Astronomy · Mathematics · #hep-th #math-ph #math.AG #math.CO
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Abstract
We derive new exact formulae for elliptic genera in two spacetime dimensions with N≥ 2 supercharges, as well as their one- and zero-dimensional counterparts (for Witten indices and matrix-model partition functions). Our results are written as a discrete sum over geometric/combinatorial structures of crystals introduced previously by the authors. The contribution from each crystal may be expressed in terms of the boundary data of a finite substructure of the crystal called the molecules. Our results provide vast generalisations of the celebrated Nekrasov partition function enumerated by the Young diagrams, and uncover new combinatorics underlying the crystal melting. We also analyse the thermodynamic limit of crystals arising from two-dimensional N=(0,2) theories associated with toric Calabi-Yau fourfolds, where a projection of the Calabi-Yau geometry emerges in the limit.
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