论文标题
Schwinger粒子的产生：快速关闭外场与动态辅助
Schwinger particle production: Rapid switch off of the external field versus dynamical assistance
论文作者
论文摘要
我们考虑在迅速打开和关闭强电背景的情况下，电子峰值对产生的过程并检查了总颗粒产量。对于足够尖锐的场曲线，可以大大增强粒子数。已经证明，这种增强与在强背景上叠加的弱高频场的动态辅助现象非常相似。通过精确的数值计算，全球instanton方法和局部恒定场近似，对这两种机制进行了分析。我们确定了开关曲线的时间尺度，导致成对产生增强，并认为通过塑造逼真的激光脉冲的关闭的转换，颗粒的产量极不可能增加。另一方面，我们确认可以通过在强大的电力背景中添加一个迅速振荡的场来观察动态辅助的舒温格效应是可行的。
We consider the process of electron-positron pair production in the presence of strong electric backgrounds being rapidly switched on and off and examine the total particle yield. For sufficiently sharp field profiles, the particle number can be substantially enhanced. It is demonstrated that this enhancement is quite similar to the phenomenon of dynamical assistance by a weak high-frequency field superimposed on a strong background. Both these mechanisms are analyzed by means of exact numerical computations, worldline instanton approach, and the locally-constant field approximation. We identify the time scale of the switching profile leading to the pair-production enhancement and argue that the particle yield is highly unlikely to be increased by shaping the switch off of realistic laser pulses. On the other hand, we confirm that it is feasible to observe the dynamically assisted Schwinger effect by adding a rapidly oscillating field to a strong electric background.
