In all of the introductory Quantum Field Theory texts I gave read so far, (such as Zee, Srednicki, Luke), there is an introduction to the concept of fields as operators, following the simple harmonic oscillator analogy.
After an illustration of how creation and annihilation operators methods are applied, the texts then go on to discuss the various (and large) range of other topics related to QFT.
My question is: does the level of discussion specifically around the process of creation of a particle from a field in these texts reflect as much as we can say about the subject, or do more advanced texts go further into this mechanism?
My problem here is that I don't know enough about QFT when searching online to recognize if there are more advanced discussions in standard texts, for example Weinbergs' Fields, which is why I am asking here.
At this stage, I simply want to know is the topic taken further later in more advanced texts, or does the simple harmonic model pretty much sum up our current model? (Probably not).
The reason I ask is simple curiosity, I certainly am not ready to tackle anything more than is contained in the excellent texts listed above.
I have read questions such as Excitations in a Field but that doesn't really address my question.