论文标题
在不均匀电场中的配对生产与相位调制
Pair production in inhomogeneous electric fields with phase modulation
论文作者
论文摘要
在具有较高或/和低中央频率以及正弦波调制的空间非均匀电场中研究了电子峰值对生产。发现动量光谱（降低的粒子数）对相位的调制振幅（调制频率）更敏感。应用调制参数越强，动量频谱中的干扰效应就越明显。特别是，对于高中央频率场，在调制振幅变大时会严重破坏动量光谱中的极好的对称性。通过调制参数，还可以在大约几次或/和一个顺序的情况下大大增强颗粒数。此外，仔细检查了空间尺度对减少粒子数的影响，并发现它在小空间尺度下迅速增加，而在大空间尺度下，它往往是恒定的。为减少的粒子数揭示了两个有趣的特征，即找到最佳调制参数，并且可以通过不同的调制参数获得相同的粒子数。后一个发现很重要，因为即使对于最佳对生产，也可以选择不同的相位调制方式来实现所需的对数。
Electron-positron pair production is investigated in spatial inhomogeneous electric fields with high or/and low central frequency as well as sinusoidal phase modulation. It is found that the momentum spectrum (the reduced particle number) is more sensitive to the modulated amplitude (modulated frequency) of the phase. The stronger the modulation parameters are applied, the more remarkable the interference effect in momentum spectrum occur. In particular, for high central frequency field, an extremely good symmetry in momentum spectrum is found while it is destroyed severely when the modulated amplitude becomes large. The reduced particle number can be also enhanced greatly at about a few times or/and one order by the modulation parameters. Moreover, the effect of spatial scales on the reduced particle number are examined carefully and found that it increases rapidly at small spatial scales, while it tends to be a constant at large spatial scales. Two interesting features are revealed for the reduced particle number, i.e., the optimal modulation parameters are found and the same particle number can be got through different set of modulation parameters. The latter findings is important because one can choose different ways of phase modulation to realize the required pair number even if for the optimal pair production.
