标题： 介质电磁学中爱因斯坦协变性原理的一些后果 显示英文标题

标题： Some consequences of the Einstein covariance principle in electrodynamics of media

摘要： 我们证明了爱因斯坦协变性原理提供了一个机会，可以从已知解中生成给定协变方程的无限多个解。 利用这一结论，我们推导出在任意外部场中的介质中电荷和电流密度的精确表达式。 我们得到，在均匀非色散介质中，点粒子的场在短距离处与众所周知的表达式不同。 我们还表明，在线性介质中，二次谐波产生和光学检测在径向极化辐射的场中成为可能。 显示英文摘要

摘要： We show that the Einstein covariance principle provides an opportunity to generate infinitely many solutions of given covariant equation from a known one. With use of this statement we derive exact expressions for charge and current densities in a medium in an arbitrary external field. We obtain that in a homogeneous nondispersive medium the field of a point particle differs at short-distances from the well known expression. We also demonstrate that in a linear medium second harmonic generation and optical detection become possible in the field of radially polarized radiation.