Saturday, January 31, 2015

homework and exercises - Noether's theorem for scale invariance



When we have the Lagrangian L=12μϕμϕ

We have a symmetry given by xμeαxμ,ϕeαϕ.
I'm struggling to find the Noether charge for this symmetry. The formula is jμ=Lμϕδϕkμ
where δϕ=ϕ
in this case, but I can't find kμ such that δL=μkμ.




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