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arXiv · 2605.18514

Monodromy of Calabi-Yau threefold flops via grade restriction rule and their quantum Kahler moduli

Ban Lin·Mauricio Romo
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Abstract

We present exact expressions, based on the grade restriction rule and window categories, for monodromies associated to certain Calabi-Yau threefold flops. We show a general formula for the monodromy action on the lattice of B-brane charges, based on the hemisphere partition function for abelian and nonabelian gauged linear sigma models. We exploit the explicit form of the discriminant in the quantum K\"ahler moduli to further refine the form of the monodromies, in several examples, using their relation to the fundamental group of nested torus links.

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Ban Lin, Mauricio Romo. 2026-05-18. Monodromy of Calabi-Yau threefold flops via grade restriction rule and their quantum Kahler moduli. https://arxiv.org/abs/2605.18514

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