Locally-constant field approximation in studies of electron-positron pair production in strong external fields
Locally-constant field approximation in studies of electron-positron pair production in strong external fields
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DOI：
10.1103/physrevd.99.016020
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发表时间：
2018-11
影响因子：
5
通讯作者：
I. Aleksandrov;G. Plunien;V. Shabaev
中科院分区：
文献类型：
--
作者：
I. Aleksandrov;G. Plunien;V. Shabaev
在本研究中，我们重新审视了广泛使用的局部恒定场近似（LCFA）的背景下，在强电磁背景中的对生产现象。通过非微扰数值计算，我们评估的LCFA的有效性，考虑几个空间均匀的场配置和一些时空相关的情况。通过研究产生的粒子的动量谱，我们确定了LCFA的适用性标准。它表明，Keldysh参数本身不允许一个判断，如果LCFA应该准确地执行。事实上，外场参数必须服从更少的平凡关系，其形式取决于场位形。我们揭示了这些关系的几个通用属性，也可以应用到更广泛的类的其他对生产的情况。
In the present investigation we revisit the widely-used locally-constant field approximation (LCFA) in the context of the pair-production phenomenon in strong electromagnetic backgrounds. By means of nonperturbative numerical calculations, we assess the validity of the LCFA considering several spatially homogeneous field configurations and a number of space-time-dependent scenarios. By studying the momentum spectra of particles produced, we identify the criteria for the applicability of the LCFA. It is demonstrated that the Keldysh parameter itself does not allow one to judge if the LCFA should perform accurately. In fact, the external field parameters must obey less trivial relations whose form depends on the field configuration. We reveal several generic properties of these relations which can also be applied to a broader class of other pair-production scenarios.