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Renormalization group study of magnetic catalysis in the 3d Gross-Neveu model

机译:3d Gross-Neveu模型中磁催化的重归一化小组研究

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摘要

Magnetic catalysis describes the enhancement of symmetry-breaking quantum fluctuations in chirally symmetric quantum field theories by the coupling of fermionic degrees of freedom to a magnetic background configuration. We use the functional renormalization group to investigate this phenomenon for interacting Dirac fermions propagating in (2 + l)-dimensional space-time, described by the Gross-Neveu model. We identify pointlike operators up to quartic fermionic terms that can be generated in the renormalization group flow by the presence of an external magnetic field. We employ the beta function for the fermionic coupling to quantitatively analyze the field dependence of the induced spectral gap. Within our pointlike truncation, the renormalization group flow provides a simple picture for magnetic catalysis.
机译:磁催化描述了手性对称量子场论中通过打破费米子自由度与磁性本底构型相结合而打破对称性的量子涨落。我们使用功能重整化小组来研究这一现象,以与在Gross(Neveu)模型所描述的(2 + l)维时空中传播的狄拉克费米子相互作用。我们确定了由四次费米子项引起的点状算子,这些项可以通过外部磁场的存在而在重归一化群流中生成。我们将β函数用于铁离子耦合,以定量分析感应光谱间隙的场依赖性。在我们的点状截断中,重归一化组流为磁催化提供了简单的图片。

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