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Heaps, Crystals, and Preprojective Algebra Modules by Dranowski, Anne; Elek, Balazs; Kamnitzer, Joel; Morton-Ferguson, Calder is a scholarly article available to read on EtoBox.

What is Heaps, Crystals, and Preprojective Algebra Modules about?

Fix a simply-laced semisimple Lie algebra. We study the crystal $ B(n\lambda)$, were $\lambda$ is a dominant minuscule weight and $n$ is a natural number. On one hand, $B(n\lambda)$ can be realized combinatorially by height $n$ reverse plane partitions on a heap associated to $\lambda$. On the other hand, we use this heap to define a module over the preprojective algebra of the underlying Dynkin quiver. Using the work of Saito and Savage-Tingley, we realize $B(n\lambda)$ via irreducible components of the quiver Grassmannian of $n$ copies of this module. In this paper, we describe an explicit bijection between these two models for $B(n\lambda)$ and prove that our bijection yields an isomorphism of crystals. Our main geometric tool is Nakajima's tensor product quiver varieties.

Author

Dranowski, Anne; Elek, Balazs; Kamnitzer, Joel; Morton-Ferguson, Calder

Published

2022

Language

EN