
边寒剑 发表于 2013-12-20 16:30* D# w) A. Q J5 t) W' c% W
我一直对克鲁扎方程很感兴趣,他们能够将万有引力和电磁力统一,但是需要多加一个维。所以也许宇宙是四维 ...
At the time, it was known that Maxwell's equations, when applied to moving bodies, led to asymmetries (Moving magnet and conductor problem), and that it had not been possible to discover any motion of the Earth relative to the 'light medium'. Einstein puts forward two postulates to explain these observations. First, he applies the principle of relativity, which states that the laws of physics remain the same for any non-accelerating frame of reference (called an inertial reference frame), to the laws of electrodynamics and optics as well as mechanics. In the second postulate, Einstein proposes that the speed of light has the same value in all inertial frames of reference, independent of the state of motion of the emitting body.
冰蚁 发表于 2013-12-26 23:034 N8 o9 I. C4 W
电动力学 electrodynamics 研究电子/电流运动的,说白了就是电磁学。
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爱因斯坦的狭义相对论取这个名字 ...
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