强激光场中正负粒子对产生效应的理论和数值模拟研究

Due to the rapid development of the laser technology, the topic of electron-positron pair creation process in the vacuum triggered by an ultra-strong field has received wide attention in the physics community. With the help of theoretical and numerical tools and the full temporal and spatial resolution of the Dirac equation, we study the pair creation process systematically. To further understand the pair creation dynamics in strong electromagnetic field, the content of this project is organized as follows: (1) By analyzing the bound states that exists in the system, to further understand its influence to the pair creation process. (2) To discuss the effect of the ponderomotive force towards the system energy levels and the pair creation process by using a supercritical model. (3) With further modification of the program, to study the pair creation process in a two-dimensional model with different combination of the electric and magnetic fields.

随着激光技术的快速发展，强场下真空中正负粒子产生过程，也就是“光转化为物质”这一课题，逐渐成为一个热点话题。本项目借助于理论解析和数值模拟，在全时间和空间上数值求解狄拉克方程，对强激光场中的真空极化以及正负粒子对产生过程进行深入理论研究。以进一步探索接近实际强电磁场条件下正负粒子对产生动力学过程为目的，本项目的主要研究内容可分为以下三个部分：（1）通过研究系统中存在的束缚态，进一步了解束缚态结构对正负粒子产生过程的影响。（2）对超临界外场模型进行模拟，以讨论并验证电磁场有质动力对系统能级以及粒子产生过程的作用。（3）进一步改进模型，以实现在二维模拟中不同种类电磁场组合下的粒子产生过程研究。