Finite Size Correction and Conformal Anomaly for O(n) Spin System

Abstract

The finite size correction to the free energy of the critical O(n) model is calculated. With the use of the formula obtained by Blöte et al., the present result can predict the conformal anomaly of the model. In this way, the parameter dependence of the conformal anomaly predicted by Dotsenko and Fateev is confirmed in a certain parameter region.