论文标题
电磁信号在动态轴背景下的时间域特性
Time-domain properties of electromagnetic signals in a dynamical axion background
论文作者
论文摘要
动态轴心背景中的电磁波在高频和低频下以高频和不稳定性的形式显示出超亮的速度，从而改变了光子在空间中传播的方式。局部干扰是有因果传播的，但与普通的麦克斯韦理论不同，传播发生在内部和灯笼上。对于不稳定的模式，电磁场中的能量密度沿着定时位移呈指数增长。在本文中，我们在各种限制中得出了轴突电动力学中的延迟绿色功能，并研究了传播信号的时间域特性。
Electromagnetic waves in a dynamical axion background exhibit superluminal group velocities at high frequencies and instabilities at low frequencies, altering how photons propagate through space. Local disturbances propagate causally, but unlike in ordinary Maxwell theory, propagation occurs inside as well as on the lightcone. For the unstable modes, the energy density in the electromagnetic field grows exponentially along timelike displacements. In this paper we derive retarded Green functions in axion electrodynamics in various limits and study the time-domain properties of propagating signals.
