Prelogarithmic operators and Jordan blocks in SL(2)_k affine algebra

Abstract

The free field description of logarithmic and prelogarithmic operators in non compact Wess-Zumino-Witten model is analysed. We study the structure of the Jordan blocks of the SL(2)_k affine algebra and the role of the puncture operator in the theory in relation with the unitarity bound.

16 pages. Corrected some typos, references and comments added

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