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I get confused when trying to find this. Please describe it as simply as possible, but keep in mind I have no budget whatsoever to pay for textbooks, so here goes:

How do you find the creation and annihilation operators of a scalar field given the Lagrangian density?

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    $\begingroup$ Would this be of any help? $\endgroup$ – Demosthene Mar 6 '15 at 1:22
  • $\begingroup$ It is a little too hard to understand.. $\endgroup$ – Damon Blevins Mar 7 '15 at 17:31