摘要
在空间均匀含时的强外场下真空正负电子对产生的研究中,从散射势转变点的角度,严格证明了源于量子Vlasov方程的低密度近似方法(low density approximation,LDA)与半经典的WKB(Wentzel-Kramers-Brillouin)方法等价.通过对典型例子进行数值计算和说明,对这2种方法的等价性进行了检验.当有较多转变点时,WKB积分变得烦琐,相较而言,LDA更具有计算优势.本研究将量子动力学过程和量子隧穿过程联系起来,有助于深入理解强场下真空中正负电子对的产生过程.
Electron-positron pair production in time-dependent homogenous strong external electric field is investigated.For turning points of scattering potential,low-density approximation(LDA)arising from quantum Vlasov equation is proven to be equivalent to semi-classical WKB(Wentzel-Kramers-Brillouin)method.Typical examples are used to confirmed numerically the equivalency of these two methods.When there are too many turning points,WKB integrals become tedious,then LDA is a more convenient calculation technique.Our work by the combination of quantum kinetic process with quantum tunneling process will facilitate understanding of electronpositron pair production in the vacuum under strong fields.
作者
李烈娟
麦丽开·麦提斯迪克
王莉
谢柏松
LI Liejuan;Melike MOHAMEDSEDIK;WANG Li;XIE Baisong(College of Nuclear Science and Technology,Beijing Normal University,100875,Beijing,China;Institute of Radiation Technology,Beijing Academy of Science and Technology,100875,Beijing,China)
出处
《北京师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第5期743-747,共5页
Journal of Beijing Normal University(Natural Science)
基金
国家自然科学基金资助项目(11875007)。
关键词
强场物理
正负电子对产生
低密度近似
strong field physics
electron-positron pair production
low density approximation
