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The critical exponent η is calculated in the Gross Neveu model in arbitrary dimensions to next to leading order within the 1/N expansion, by computing the skeleton equations for the propagators near the critical region. The exponent ν is also computed and the next to leading order structure of the β-function deduced. Consequently, the four-loop term of the anomalous dimension is determined.
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J. A. Gracey (1991) studied this question.
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