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首页> 外文期刊>Journal of physics, A. Mathematical and theoretical >Asymptotic behavior in a model with Yukawa interaction from Schwinger-Dyson equations
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Asymptotic behavior in a model with Yukawa interaction from Schwinger-Dyson equations

机译:Schwinger-Dyson方程与Yukawa相互作用的模型中的渐近行为

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摘要

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 Δ. It is argued, however, that a full solution may be free from non-physical singularities and has the self-consistent asymptotic behavior p ~2 _eδ? C log ~(-4/5) p ~2 _e/M ~2. An approximate solution confirms the positivity of C and the absence of Landau pole.
机译:研究了在两粒子近似下伪标量二维Yukawa模型的Schwinger-Dyson方程组。该系统的最简单的迭代解对应于平均场近似(或等效地等于1 / N扩展的前导阶数),并且在深欧几里得区域中包括伪标量传播子Δ的非物理Landau极点。然而,有人认为,一个完整的解可能没有非物理奇异性,并且具有自洽的渐近行为p〜2_eδ? C log〜(-4/5)p〜2 _e / M〜2。一个近似解证实了C的正性和不存在Landau极。

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