Bell-Szekeres (BS) solution for colliding electromagnetic waves in Einstein-Maxwell (EM) theory describes also colliding waves in nonlinear electrodynamics (NED) with an emergent cosmological constant. Our NED model covers the first leading orders to the well-known Heisenberg-Euler (HE) type in a particular gauge of pure magnetic field. Prior to the problem of collision we obtain dyonic solution for the considered NED theory in a conformally flat spacetime which has both electric and magnetic fields with constant invariants. Our sole finding is that null currents inevitably arise in the process of collision of plane waves in the HE type NED theory.

中文翻译：

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非线性电动力学模型中的碰撞波

爱因斯坦-麦克斯韦 (EM) 理论中用于碰撞电磁波的 Bell-Szekeres (BS) 解决方案还描述了非线性电动力学 (NED) 中具有涌现宇宙常数的碰撞波。我们的 NED 模型涵盖了特定规格的纯磁场中著名的 Heisenberg-Euler (HE) 类型的第一个主要订单。在碰撞问题之前，我们在共形平坦时空中获得了所考虑的 NED 理论的动态解，该时空具有恒定不变的电场和磁场。我们唯一的发现是在HE型NED理论中，平面波碰撞过程中不可避免地会出现零电流。