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arXiv physics/0410114physics.plasm-phhep-phphysics.acc-phquant-ph
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光学激光场中电子-正电子等离子体的脉动

Pulsations of the electron-positron plasma in the field of optical lasers

D. B. Blaschke, A. V. Prozorkevich, S. A. Smolyansky, A. V. Tarakanov

摘要:

讨论了利用强激光脉冲产生真空正负电子对的可能性。我们采用量子动力学公式的问题与源项描述真空对生产在一个均匀的电场与任意时间依赖性(动态Schwinger机制)。对于一个弱于临界值E_{cr} =m^2/ |e|的周期场,电子-正电子等离子体密度以两倍于场频率的频率近似周期性地变化。在这些条件下,体积λ ^3中每个周期密度的平均值$<n>$是比剩余密度n_r更合适的特征量,剩余密度n_r是在整数个场周期上采用并使用虚时间法计算的。该值<n>与场强的平方成比例,而不依赖于频率。我们表明,在参数<n>的光学激光可以更有效地比X射线之一。我们希望不仅可以通过计划中的X射线自由电子激光,而且已经可以在当今的光学激光器上观察到真空产生效应。

英文摘要:

The possibility to observe vacuum electron-positron pair creation due to a powerful optical laser pulse is discussed. We employ a quantum kinetic formulation of the problem with a source term describing the vacuum pair production in a homogeneous electric field with arbitrary time dependence (dynamical Schwinger mechanism). For a periodic field weak in comparison with the critical value E_{cr}=m^2/|e|, the electron-positron plasma density changes approximately periodically with twice the field frequency. Under these conditions, the mean value $<n>$ for the density per period in the volume lambda^3 is a more appropriate characteristic quantity than the residual density n_r which is taken over an integer number of field periods and calculated using the imaginary time method. The value <n> is proportional to the squared field intensity and does not depend on the frequency. We show that in terms of the parameter <n> an optical laser can be more effective than a X-ray one. We expect that it is possible to observe the vacuum creation effect not only by means of the planned X-ray free electron lasers but already at present-day optical lasers.

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