Normal ordering of hamiltonian
Physics Asked on November 24, 2020
I came across this in the lecture notes of quantum field theory by David Tong. Inside time ordering interactions aren’t taken to be normal ordered. Interaction hamiltonian should be normal ordered otherwise it is not well defined (due to ordering ambiguity and related singularities). Most standard QFT textbooks don’t address this issue. Am i missing something here or normal ordering was assumed?
One Answer
Here there should be normal ordering for individual interaction terms inside time ordering.
Answered by Roy on November 24, 2020
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