How Complete is the Classification of W-Symmetries ?
W. Eholzer, A. Honecker, R. Huebel
Abstract
In 2D conformal quantum field theory, we continue a systematic study of W-algebras with two and three generators and their highest weight representations focussing mainly on rational models. We review the known facts about rational models of W(2,δ)-algebras. Our new rational models of W-algebras with two generators all belong to one of the known series. The majority of W-algebras with three generators -including the new ones constructed in this letter- can be explained as subalgebras or truncations of Casimir algebras. Nonetheless, for one solution of W(2,4,6) we reveal some features that do not fit into the pattern of Casimir algebras or orbifolds thereof. This shows that there are more W-algebras than those predicted from Casimir algebras (or Toda field theories). However, most of the known rational conformal field theories belong to the minimal series of some Casimir algebra.
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