动态Schwinger过程的余辉：软光子的聚集
Afterglow of the dynamical Schwinger process: soft photons amass
摘要：
我们把电场到光子的转换作为动态Schwinger过程的第二个探测。在空间均匀电场中，电子-正电子（$e^+e^-$）对的量子涨落在质量壳层上被提升，留下一个渐近小的有限对密度。$e^+e^-$动力学又耦合到量子化的光子场，并驱动其在壳层模式的占领。用最低阶微扰理论计算了伴随Schwinger过程的渐近光子的光谱性质。光学范围内的软光子在次临界区域中产生，从而提供了一个有希望的发现途径，例如，用于即将投入运行的极光计划（ELI-NP）的激光参数。
英文摘要：
We consider the conversion of an electric field into photons as a secondary probe of the dynamical Schwinger process. In spatially homogeneous electric fields, quantum fluctuations of electron-positron ($e^+e^-$) pairs are lifted on the mass shell leaving asymptotically a small finite pair density. The $e^+e^-$ dynamics in turn couples to the quantized photon field and drives its on-shell mode occupation. The spectral properties of the emerging asymptotic photons accompanying the Schwinger process are calculated in lowest-order perturbation theory. Soft photons in the optical range are produced amass in the sub critical region, thus providing a promising discovery avenue, e.g. for laser parameters of the Extreme Light Initiative (ELI-NP) to be put in operation soon.
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