非平面波强激光场中的真空极化问题

项目名称： 非平面波强激光场中的真空极化问题

项目编号： No.11204370

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 胡华雨

作者单位： 中国空气动力研究与发展中心

项目金额： 24万元

中文摘要： 超强激光技术的发展，不仅提供了实验探索真空极化问题的重要手段，而研究超强激光场的传输、聚焦等特性，及其与粒子的非微扰相互作用，也需要考虑真空极化的影响。本项目研究非平面波强激光场中的真空极化问题。从数值求解非平面波激光场中的Dirac方程和Klein-Gordon方程出发，发展可靠的理论与数值结合的方法，获得足够精度的非平面波激光场缀饰粒子量子态的近似解，从而把非微扰的激光缀饰量子电动力学方法推广到具有实际意义的非平面波强激光场的情况。在此基础上计算粒子与非平面波强激光场撞击产生正负电子对问题，推导强场与虚粒子非微扰相互作用带来的对经典量子电动力学有效场理论的高阶修正，探索真空极化作用下激光场强度分布自适应变化过程。本项目的研究对发展非微扰理论方法，对理解超强激光场中的量子电动力学现象，对提高理论预测和验证实验的能力都具有重要的科学价值。

中文关键词： 强激光场；真空极化；非平面波；激光缀饰QED；Volkov态

英文摘要： The development of super intense laser technology provides an important method to explore vacuum polarization problems experimentally. It also requires the study of vacuum polarization as the transport and focusing characteristics of the super intense laser fields and the nonperturbative interactions of the fields and particles are influenced by that. This project carries out research on vacuum polarization in non-plane wave intense laser fields. It starts out with solving Dirac equation and Klein-Gordon equation in non-plane wave laser fields, and develops reliable integrated theoretical and numerical methods to obtain accurate enough approximate solutions for non-plane-wave-laser-dressed particle quantum states. Therefore it generalizes the nonperturbative laser-dressed quantum electrodynamics method to practically significant non-plane wave situations. On this basis the electron-positron pair production problems are calculated for particles colliding with non-plane wave laser fields, a higher-order modification to conventional QED effective theory is deduced as the nonperturbative interaction between the intense fields and virtual particles is taken into account, and the self-adaptive process of the laser field under the influence of vacuum polarization is explored. This research has scientifically significa

英文关键词： strong laser；vacuum polarization；non-plane-wave；laser-dressed QED；Volkov state