缓变电磁场中的光子传输
Photon propagation in slowly varying electromagnetic fields
摘要：
本文研究了QED中单圈阶缓变电磁背景场中软光子的有效理论。这对于研究高强度激光所提供的真实电磁背景场中量子真空非线性的全光特征具有重要意义。本文的主要结果是两束线偏振反向传输的脉冲高斯激光束中光子偏振张量的一个新的解析表达式。当我们把两个激光束的峰值场强度作为自由参数时，这个场配置可以被认为是在纯粹向右或向左移动的激光束的极限情况（如果其中一个峰值场强度被设置为零）和具有两个相等强度的反向传播光束的驻波型场景之间的插值。
英文摘要：
We study the effective theory of soft photons in slowly varying electromagnetic background fields at one-loop order in QED. This is of relevance for the study of all-optical signatures of quantum vacuum nonlinearity in realistic electromagnetic background fields as provided by high-intensity lasers. The central result derived in this article is a new analytical expression for the photon polarization tensor in two linearly polarized counter-propagating pulsed Gaussian laser beams. As we treat the peak field strengths of both laser beams as free parameters this field configuration can be considered as interpolating between the limiting cases of a purely right- or left-moving laser beam (if one of the peak field strengths is set to zero) and the standing-wave type scenario with two counter-propagating beams of equal strength.
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