- #1

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- Summary:
- In quantum field theory, when quantising the Klein Gordon field reorder some operators without caring of their commutators for the hamiltonian

As explained in the summary, it seems that the commutators of some operators (creation and anihilation) can be ignored when quantising the hamiltonian of the Klein Gordon Field. I wonder why we are allowed to do such a thing.

Is that possible because we are solely within a semiquantum (semiclassical) level? But if this was the case, how can one know which commutators can be ignored and which cannot? Or may be all of them can be ignored?

I need some help on this.

Thanks in advance.

Is that possible because we are solely within a semiquantum (semiclassical) level? But if this was the case, how can one know which commutators can be ignored and which cannot? Or may be all of them can be ignored?

I need some help on this.

Thanks in advance.