3 papers
hep-th2026
2d Conformal Field Theories on Magic Triangle
Kimyeong Lee, Kaiwen Sun
The magic triangle due to Cvitanović and Deligne--Gross is an extension of the Freudenthal--Tits magic square of semisimple Lie algebras. In this paper, we identify all two-dimensi…
math-ph2024
On Intermediate Exceptional Series
Kimyeong Lee, Kaiwen Sun, Haowu Wang
The Freudenthal--Tits magic square for of semi-simple Lie algebras can be extende…
math.NT2023
Hyperbolization of Affine Lie Algebras
Kaiwen Sun, Haowu Wang, Brandon Williams
In 1983, Feingold and Frenkel discovered a relation between Siegel modular forms of genus two and a rank-three hyperbolic Kac--Moody algebra extending the affine Lie algebra of typ…