I wanna prove the invariance of the Klein-Gordon Lagrangian [itex] \mathcal{L}=\frac 1 2 \partial^\mu \phi \partial_\mu \phi-\frac 1 2 m^2 \phi^2 [/itex] under a general Lorentz transformation [itex] \Lambda^\alpha_\beta [/itex] but I don't know what should I do. I don't know how to handle it. How should I do it?(adsbygoogle = window.adsbygoogle || []).push({});

Thanks

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# Lorentz invariance of Klein-Gordon Lagrangian

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