When we have the Lagrangian L=12∂μϕ∂μϕ We have a symmetry given by xμ↦eαxμ,ϕ↦e−αϕ. I'm struggling to find the Noether charge for this symmetry. The formula is jμ=∂L∂∂μϕδϕ−kμ where δϕ=−ϕ in this case, but I can't find kμ such that δL=∂μkμ.
Saturday, January 31, 2015
homework and exercises - Noether's theorem for scale invariance
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