Shifted Quiver Quantum Toroidal Algebra and Subcrystal Representations

Abstract

Recently, new classes of infinite-dimensional algebras, quiver Yangian (QY) and shifted QY, were introduced, and they act on BPS states for non-compact toric Calabi-Yau threefolds. In particular, shifted QY acts on general subcrystals of the original BPS crystal. A trigonometric deformation called quiver quantum toroidal algebra (QQTA) was also proposed and shown to act on the same BPS crystal. Unlike QY, QQTA has a formal Hopf superalgebra structure which is useful in deriving representations. In this paper, we define the shifted QQTA and study a class of their representations. We define 1d and 2d subcrystals of the original 3d crystal by removing a few arrows from the original quiver diagram and show how the shifted QQTA acts on them. We construct the 2d crystal representations from the 1d crystal representations by utilizing a generalized coproduct acting on different shifted QQTAs. We provide a detailed derivation of subcrystal representations of ${\mathbb{C}}^3$, ${\mathbb{C}}^3/{\mathbb{Z}}_n(n\ge 2)$, conifold, suspended pinch point, and ${\mathbb{C}}^3/({\mathbb{Z}}_2\times {\mathbb{Z}}_2)$.

arXiv comment59+23 pages, many figures. v2:fixed typos and added references, v3: added discussions, v4: published version

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