Dynamically assisted Schwinger effect beyond the spatially-uniform-field approximation
Dynamically assisted Schwinger effect beyond the spatially-uniform-field approximation
复制标题
DOI：
10.1103/physrevd.97.116001
复制
发表时间：
2018-05
影响因子：
5
通讯作者：
I. Aleksandrov;G. Plunien;V. Shabaev
中科院分区：
文献类型：
--
作者：
I. Aleksandrov;G. Plunien;V. Shabaev
我们研究了在强电场和弱而快速变化的脉冲的叠加作用下，从真空中产生电子-正电子对的现象。我们采用了非微扰数值技术，并进行计算超出了空间均匀场近似，即，偶极近似，考虑到快速分量的坐标依赖性。对生产过程的主要特征（粒子的动量谱和对的总量）的分析揭示了一些重要的功能，这是在以前使用的近似中没有。特别是，动量分布的结构被定性和定量地修改，并且所创建的对的总数以及由于动力学辅助的增强因子变得显著更小。
We investigate the phenomenon of electron-positron pair production from vacuum in the presence of a strong electric field superimposed by a weak but fast varying pulse which substantially increases the total particle yield. We employ a nonperturbative numerical technique and perform the calculations beyond the spatially-uniform-field approximation, i.e., dipole approximation, taking into account the coordinate dependence of the fast component. The analysis of the main characteristics of the pair-production process (momentum spectra of particles and total amount of pairs) reveals a number of important features which are absent within the previously used approximation. In particular, the structure of the momentum distribution is modified both qualitatively and quantitatively, and the total number of pairs created as well as the enhancement factor due to dynamical assistance become significantly smaller.