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首页> 外文期刊>Journal of physics, A. Mathematical and theoretical >Summing parquet diagrams using the functional renormalization group: X-ray problem revisited
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Summing parquet diagrams using the functional renormalization group: X-ray problem revisited

机译:使用功能重新归一化组对镶木图进行汇总:重新讨论了X射线问题

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摘要

We present a simple method for summing so-called parquet diagrams of fermionic many-body systems with competing instabilities using the functional renormalization group. Our method is based on partial bosonization of the interaction using multi-channel Hubbard-Stratonovich transformations. A simple truncation of the resulting flow equations, retaining only the frequencyindependent parts of the two-point and three-point vertices amounts to solving coupled Bethe-Salpeter equations for the effective interaction to leading logarithmic order. We apply our method by revisiting the X-ray problem and deriving the singular frequency dependence of the X-ray response function and the particle-particle susceptibility. Our method is quite general and should be useful in many-body problems involving strong fluctuations in several scattering channels.
机译:我们提出了一种简单的方法,用于使用功能重归一化组来求和具有竞争性不稳定性的费米离子多体系统的所谓拼花图。我们的方法基于使用多通道Hubbard-Stratonovich变换的部分玻色化相互作用。简单地截断所得流量方程,仅保留两点和三点顶点的频率无关部分,就等于求解了耦合的Bethe-Salpeter方程,以便有效地与对数阶交互。我们通过重新审视X射线问题并推导X射线响应函数的奇异频率依赖性和粒子对粒子的磁化率来应用我们的方法。我们的方法相当通用,在涉及多个散射通道中强烈波动的多体问题中应该很有用。

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