Electron-positron pair production in the presence of strong and oscillating electromagnetic fields

本项目旨在对时空变化强激光场中电子-正电子对产生过程进行理论研究。用非微扰数值方法计算了两束反向传播激光束在偶极子近似和驻波近似之外产生对的概率。特别是，脉冲形状对成对生产过程的可观察数量和特性的影响将被检查。此外，我们将研究一个强而缓慢变化的电场叠加一个弱而快速的脉冲（动态辅助Schwinger效应）的情况。考虑到这些问题中外场的空间依赖性和对各种脉冲形状的分析，将允许找到实验观察施温格效应所需的最有利的配置。

This project aims at the theoretical study of the electron-positron pair-creation process in strong laser fields varying in space and time. The pair-production probabilities will be calculated for the case of two counter-propagating laser beams beyond the dipole approximation and beyond the standing-wave approximation by means of a nonperturbative numerical technique. In particular, the pulse shape effects on observable quantities and characteristics of the pair-production process will be examined. Besides, we will study the scenario of a strong but slowly varying electric field superimposed by a weak but fast pulse (dynamically assistant Schwinger effect). Taking into account the spatial dependence of the external fields within these problems and the analysis of various pulse shapes will allow to find the most favorable configurations needed for the experimental observation of the Schwinger effect.