Hello! Can someone explain to me what exactly a local gauge invariance is? I am reading my first particle physics book and it seems that putting this local gauge invariance to different lagrangians you obtain most of the standard model. The math makes sense to me, I just don't see what is the physical meaning of this local gauge invariance and why would you come up with it? Like, it seems such an easy thing to do, just make the phase of wave function depends on position, but doing this you obtain everything up to Higgs field, and I am not sure I understand, physically, why. Thank you(adsbygoogle = window.adsbygoogle || []).push({});

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# I Local Gauge invariance

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