论文标题
在强电场中创建对的电流
Currents of created pairs in strong electric fields
论文作者
论文摘要
我们计算在4D QED中为各种初始状态的4D QED中创建的粒子的树 - 创建粒子的水平。也就是说，我们在脉冲背景中的初始真空和过去无穷大的热状态。在这两种情况下，我们都发现电流随脉冲的长度线性增长，其比例系数包含特征性的schwinger因子。对于恒定的电场背景，我们计算几种不同初始状态的电流。我们观察到，在这种情况下，电流为零或线性分歧。我们解释了这种行为的原因，并比较普通和标量QED的情况。最后，当可以观察到所谓的克莱因悖论时，我们在存在这种设置的情况下计算二维情况下的电流。
We calculate tree--level currents of created particles in strong background electric fields in 4D QED for various initial states. Namely, we do that in pulse background for initial vacuum and thermal states at past infinity. In both cases we find that the current grows linearly with the length of the pulse with coefficients of proportionality containing the characteristic Schwinger's factor. For the constant electric field background we calculate the current for several different initial states. We observe that in such a case the current is either zero or linearly divergent. We explain the reason for such a behaviour and compare the situation in ordinary and scalar QED. Finally, we calculate the current in two--dimensional situation in the presence of such settings when the so called Klein paradox can be observed.
