We construct logarithmic conformal field theories starting from an ordinary conformal field theory-with a chiral algebra C and the corresponding space of states V-via a two-step construction: (i) deforming the chiral algebra representation on V circle times End K [[z, z(-1)]], where K is an auxiliary finite-dimensional vector space, and (ii) extending C by operators corresponding to the endomorphisms End K. For K = C-2, with End K being the two-dimensional Clifford algebra, our construction results in extending C by an operator that can be thought of as partial derivative(-1) E, where closed integral E is a fermionic screening. This covers the (2, p) Virasoro minimal models as well as the (sl) over cap (2) WZW theory. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 46]
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