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arXiv 0706.1603hep-th
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QED3中Bethe-Salpter方程的解

Solutions of Bethe-Salpter equations in QED3

Yuichi Hoshino

摘要:

为了理解费米子对和费米子-反费米子对凝聚的机制,本文研究了QED $_{3}$中Bethe-Salpeter方程的解.在阶梯近似下,我们对轴标量的解与对轴矢量流的Ward-Takahashi恒等式是一致的.由于无质量标量-矢量部分是由一个耦合的积分方程描述的,本文对大动量区和小动量区分别进行近似,并将其转化为位置空间的微分方程,使之易于求解,原点的边界条件导出无量纲耦合的本征值常数$λ=e^{2}/m$ .具有离散谱的无质量标量矢量费米子-反费米子(fa)系统存在解.在我们的近似中,无质量标量矢量ff系统似乎不存在。

英文摘要:

To understand the mechanism of the fermion pair and fermion-antifermion pair condensation,the solutions of Bethe-Salpeter equation in QED$_{3}$ is examined.In the ladder appoximation our solution for the axial-scalar is consistent with Ward-Takahashi-identity for the axial vector currents.Since the massless scalar-vector sector is described by a coupled integral equation,it is difficult to solve explicitly.We approximate the equation for large and small momentum region separately and convert them into differential equations in position space.These equation can be solved easily.Boundary condition at the origin leads the eigenvalue for dimensionless coupling constant $λ=e^{2}/m$.There exists solutions for massless scalar-vector fermion-antifermion (fa) system with discrete spectrum. In our approximation massless-scalar-vector ff systemes does not seem to exist.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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