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Noether theorem and scaling, ex.: 1-D Harmonic Oscillator

  1. Aug 18, 2013 #1
    Hello,

    if I think of the harmonic oscillator action S = ∫L dt, L = 1/2 (dx/dt)^2 - 1/2 x^2, and then of the "scaling transformation" x -> x' = 1/a x (a>0, const), then x = a x', and in new coordinates x', S' has the same form as in x except for multiplication by the constant a, formally S'[x'(t)] = a.S[x'(t)]. Thus in scaled coordinates, the action functional S' (and its functional derivative) will "simply" be multiplied by a (positive) constant.
    (I understand that stationary "points" and extrema "points" of the functional S'[x'] remain (formally) "unchanged" compared to the functional S[x])

    Does Noether's theorem apply to a such transformation ?

    Thank you

    I wish you a pleasant day
     
  2. jcsd
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