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Add the Hermetian conjugate to make Lagrangian real

  1. Aug 16, 2015 #1
    How does adding a h.c. term make a Lagrangian real? Like here on page 99 (11.51)?

    thanks in advance
  2. jcsd
  3. Aug 16, 2015 #2


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    Staff: Mentor

    You add something with the same real part but with the negative imaginary part. The sum has an imaginary component of zero.

    ##z + \bar z## is always real (even if you replace z by more complex structures).
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