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arXiv · 1201.4020

Asymptotic behavior in a model with Yukawa interaction from Schwinger-Dyson equations

V. E. Rochev
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Abstract

A system of Schwinger-Dyson equations for pseudoscalar four-dimensional Yukawa model in the two-particle approximation is investigated. The simplest iterative solution of the system corresponds to the mean-field approximation (or, equivalently, to the leading order of 1/N-expansion) and includes a non-physical Landau pole in deep-Euclidean region for the pseudoscalar propagator $\Delta$. It is argued, however, that a full solution may be free from non-physical singularities and has the self-consistent asymptotic behavior $p^2_e\Delta\simeq C\,\log^{-4/5}\frac{p^2_e}{M^2}$. An approximate solution confirms the positivity of $C$ and the absence of Landau pole.

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V. E. Rochev. 2012-01-19. Asymptotic behavior in a model with Yukawa interaction from Schwinger-Dyson equations. https://doi.org/10.1088/1751-8113/45/20/205401

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