Abstract
Conformal field theories with sl ˆ ( 2 ) − 1 / 2 symmetry are studied with a view to investigating logarithmic structures. Applying the parafermionic coset construction to the non-logarithmic theory, a part of the structure of the triplet model is uncovered. In particular, the coset theory is shown to admit the triplet W-algebra as a chiral algebra. This motivates the introduction of an augmented sl ˆ ( 2 ) − 1 / 2 -theory for which the corresponding coset theory is precisely the triplet model. This augmentation is envisaged to lead to a precise characterisation of the “logarithmic lift” of the non-logarithmic sl ˆ ( 2 ) − 1 / 2 -theory that has been proposed by Lesage et al.
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