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arXiv 1302.3864hep-th
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经典点电荷的有效动力学

Effective dynamics of a classical point charge

Janos Polonyi

摘要:

在经典闭合时间路径理论的框架内,通过消去电磁场,导出了点电荷的有效拉格朗日量。电磁场的短距离奇异性由UV截止调节。亚伯拉罕-洛伦兹力恢复和它的相似性异常强调。得到了完全截断依赖的线性化运动方程,当截断超过经典装药半径时,没有发现逃逸轨迹,但有效动力学表现出非因果性。辐射反作用力的强度在其截止依赖性中显示出一个极点,这一点让人想起微扰QED的朗道极点。指出了时间反演不变性的动力学破缺与动力学对称性破缺的相似性。

英文摘要:

The effective Lagrangian of a point charge is derived by eliminating the electromagnetic field within the framework of the classical closed time path formalism. The short distance singularity of the electromagnetic field is regulated by an UV cutoff. The Abraham-Lorentz force is recovered and its similarity to anomalies is underlined. The full cutoff-dependent linearized equation of motion is obtained, no runaway trajectories are found but the effective dynamics shows acausality if the cutoff is beyond the classical charge radius. The strength of the radiation reaction force displays a pole in its cutoff-dependence in a manner reminiscent of the Landau-pole of perturbative QED. Similarity between the dynamical breakdown of the time reversal invariance and dynamical symmetry breaking is pointed out.

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