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Virasoro Algebra and O(N) Sigma Model

Jiannis Pachos

hep-tharXiv:hep-th/9705119

Abstract

Within the framework of a local expansion of the logarithm of the O(N) sigma-model vacuum functional, valid for slowly varying fields, the modified Virasoro algebra is studied. The operator-like central charge term is given, up to second order, for a general functional.

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