T. Gannon et al., LIE GROUP WEIGHT MULTIPLICITIES FROM CONFORMAL FIELD-THEORY, Journal of physics. A, mathematical and general, 28(9), 1995, pp. 2617-2625
Dominant-weight multiplicities of simple Lie groups are expressed in t
erms of the modular matrices of Wess-Zumino-Witten conformal field the
ories, and related objects. Symmetries of the modular matrices give ri
se to new relations among multiplicities. At least for some Lie groups
, these new relations are strong enough to completely fix all multipli
cities.