经典电动力学中分段常数轴子场的测量
Measuring a piecewise constant axion field in classical electrodynamics
摘要：
为了解决物质介质中的“波斯特约束”问题，我们考虑了平面电磁波在具有分段常数轴子场的介质中的传播。虽然一个恒定的轴子场不影响波在均匀介质中的传播，我们表明，在两种介质之间的界面处的波的反射和透射是敏感的轴子值的差异。尽管恒定的轴子值对麦克斯韦方程组没有贡献，但这一观测结果可以用来通过实验确定物质中的轴子片。
英文摘要：
In order to settle the problem of the "Post constraint" in material media, we consider the propagation of a plane electromagnetic wave in a medium with a piecewise constant axion field. Although a constant axion field does not affect the wave propagation in a homogeneous medium, we show that the reflection and transmission of a wave at an interface between the two media is sensitive to the difference of the axion values. This observation can be used to determine experimentally the axion piece in matter despite the fact that a constant axion value does not contribute to the Maxwell equations.
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