Abstract
By the method of functional integration the two-point functionS F for the spinor model with the interaction\( - \lambda (\bar \psi \psi )^2 \) is calculated in a two-dimensional space-time. After Fourier-transformationS F (p) results as a power series with respect to 1/√λ. If we change the order of terms, we get a series in powers of γp. Each coefficient is a series in powers of 1/√λ. The first terms of this series are considered as a good approximation for bigλ. By reasons of convergence of the integrals we must displace the expansion centre of the series in powers ofγ p fromp 2=0 top 2=a 2.
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Dedicated to ProfessorFriedrich Hund on the occasion of his 70th birthday.
The authors are indebted to Dr. A.Kühnel for his interest in this work and valuable discussions.
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Heber, G., Hoffmann, M. & Röpke, G. On the calculation of the two-point function for the thirring-model by the method of functional integration. Z. Physik 190, 191–204 (1966). https://doi.org/10.1007/BF01327142
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DOI: https://doi.org/10.1007/BF01327142