# Categorification of quantum generalized kac-moody algebras and crystal bases

Seok Jin Kang, Se Jin Oh, Euiyong Park

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

## Abstract

We construct and investigate the structure of the Khovanov-Lauda-Rouquier algebras R and their cyclotomic quotients Rλ which give a categorification of quantum generalized Kac-Moody algebras. Let UA(g) be the integral form of the quantum generalized Kac-Moody algebra associated with a Borcherds-Cartan matrix A = (aij)i, j ⋯ I and let K0(R) be the Grothendieck group of finitely generated projective graded R-modules. We prove that there exists an injective algebra homomorphism $\Phi: U-{{\mathbb A}}-(\mathfrak{g}) \rightarrow K-0(R)$ and that Φ is an isomorphism if aii ≠ 0 for all i ⋯ I. Let B(∞) and B(λ) be the crystals of $U-q-(\mathfrak{g})$ and V(λ), respectively, where V(λ) is the irreducible highest weight Uq(g)-module. We denote by B(∞) and B(λ) the isomorphism classes of irreducible graded modules over R and Rλ, respectively. If aii ≠ 0 for all i ⋯ I, we define the Uq(g)-crystal structures on B(∞) and B(λ), and show that there exist crystal isomorphisms B(∞) ≃ B(∞) and B(λ) ≃ B(λ). One of the key ingredients of our approach is the perfect basis theory for generalized Kac-Moody algebras.

Original language English 1250116 International Journal of Mathematics 23 11 https://doi.org/10.1142/S0129167X12501169 Published - Nov 2012

## Keywords

• Categorification
• crystals
• Khovanov-Lauda-Rouquier algebras
• perfect bases
• quantum generalized Kac-Moody algebras

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