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kexue
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Is it correct that theories such as the free complex scalar field or the free Dircac field with their global U(1) symmetry give rise to only globally conserved charges (a globally conserved Noether charge)? If so, how can that be shown?
Also, is it somewhat correct to say that the main reason for gauging a global symmetry, i.e. turning it into a local symmetry, is turning the globally conserverd charge into locally conserved one?
thank you
Also, is it somewhat correct to say that the main reason for gauging a global symmetry, i.e. turning it into a local symmetry, is turning the globally conserverd charge into locally conserved one?
thank you