A Note on Quiver Quantum Toroidal Algebra

TL;DR

This paper introduces a $q$-deformed version of the quiver Yangian, called quiver quantum toroidal algebra (QQTA), which extends the algebraic structures acting on BPS states in toric Calabi-Yau threefolds.

Contribution

The paper proposes the QQTA, a new algebraic structure that generalizes quiver Yangians with a $q$-deformation and analyzes its properties as a Hopf superalgebra.

Findings

QQTA is a Hopf superalgebra with a super coproduct.

QQTA contains an extra central charge C, trivial C recovers known actions.

The algebra is consistent and likely generalizable to all toric Calabi-Yau threefolds.

Abstract

Recently, Li and Yamazaki proposed a new class of infinite-dimensional algebras, quiver Yangian, which generalizes the affine Yangian $\mathfrak{gl}_{1}$. The characteristic feature of the algebra is the action on BPS states for non-compact toric Calabi-Yau threefolds, which are in one-to-one correspondence with the crystal melting models. These algebras can be bootstrapped from the action on the crystals and have various truncations. In this paper, we propose a $q$-deformed version of the quiver Yangian, referred to as the quiver quantum toroidal algebra (QQTA). We examine some of the consistency conditions of the algebra. In particular, we show that QQTA is a Hopf superalgebra with a formal super coproduct, like known quantum toroidal algebras. QQTA contains an extra central charge $C$. When it is trivial ($C=1$), QQTA has a representation acting on the three-dimensional crystals, like Li-Yamazaki's quiver Yangian. While we focus on the toric Calabi-Yau threefolds without compact 4-cycles, our analysis can likely be generalized to all toric Calabi-Yau threefolds.