论文标题
刺激的真空排放和强电磁场中的光子吸收
Stimulated vacuum emission and photon absorption in strong electromagnetic fields
论文作者
论文摘要
根据量子电动力学（QED），强大的外场可以使真空状态衰减产生电子峰值对。在这里，我们研究了伴随着非扰动过程的软光子的发射。我们的分析是在毛茸茸的图片中进行的，以精细结构常数进行一阶。结果表明，除纯真空外，在初始状态下的光子的存在引起了光子发射的额外（刺激）通道。另一方面，由于对生产过程中的光子吸收，最终（信号）光子的数量也包括负贡献。这些贡献得到了评估和比较。为了在现实场参数的域中获得定量预测，我们采用了WKB方法。我们建议使用光学探针光子束，该光束的强度在横穿空间区域时会发生变化，其中存在背景激光场的强力组件。可以证明，一旦强度背景字段的强度超过$ 10^{27}〜\ text {w/cm}^2 $，就可以在实验上观察到$ 1 \％$的相对强度变化。预计这一发现将显着支持非扰动制度中非线性QED现象的可能实验研究。
According to quantum electrodynamics (QED), a strong external field can make the vacuum state decay producing electron-positron pairs. Here we investigate emission of soft photons which accompanies a nonperturbative process of pair production. Our analysis is carried out within the Furry picture to first order in the fine-structure constant. It is shown that the presence of photons in the initial state gives rise to an additional (stimulated) channel of photon emission besides the pure vacuum one. On the other hand, the number of final (signal) photons includes also a negative contribution due to photon absorption within the pair production process. These contributions are evaluated and compared. To obtain quantitative predictions in the domain of realistic field parameters, we employ the WKB approach. We propose to use an optical probe photon beam, whose intensity changes as it traverses a spatial region where a strong electric component of a background laser field is present. It is demonstrated that relative intensity changes on the level of $1 \%$ can be experimentally observed once the intensity of the strong background field exceeds $10^{27}~\text{W/cm}^2$ within a large laser wavelength interval. This finding is expected to significantly support possible experimental investigations of nonlinear QED phenomena in the nonperturbative regime.
