Hello, I have a question. In Ryder chapter 2, he develops the KG equation and says something along the lines of "the density, in order to be relativistic, must transform like the time component of a 4 vector" and he immediately gives:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\rho=\frac{i\hbar}{2m}\left(\phi^*\frac{\partial \phi}{\partial t}-\phi\frac{\partial \phi^*}{\partial t}\right)[/tex]

Where did this come from? Seems like he just pulled it out of thin air...o.o

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# Klein-Gordon equation

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