- #26

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The symmetries like U(1):marlon said:Willem,

It is useless to use field equations because the symmetries at hand (which are broken and thus yield mass) are inherent to the Lagrangian, not to the field equation !!!

[tex]\Phi \rightarrow \Phi e^{i \phi}[/tex]

apply to the fields right?

I did! But the potential I used can be shown to be the most general form that can be used in a renormalizable theory (according to my book). So it can't harm to use that one...Again i suggest you look at the examples i gave in the two references...

regards

marlon

Where did I mix these up?ps : when using the variational principle, you can vary to both fields. The two approaches are equivalent. This does NOT mean that you can mix them up.