Abstract
Conformal invariance constrains the form of correlation functions near a free surface. In two dimensions, for a wide class of models, it completely determines the correlation functions at the critical point, and yields the exact values of the surface critical exponents. They are related to the bulk exponents in a non-trivial way. For the Q-state Potts model (0 ⩽ Q ⩽ 4) we find η <|; = 2 (3v − 1) , and for the O( N) model (−2 ⩽ N ⩽ 2), η <|; = (2v − 1) (4v − 1) .
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