Group theory is one of the most important tools in quantum field theory. In Quantum Field Theory Demystified, available on Amazon.com, it is discussed in two chapters. I have posted one of those chapters here.
In the section where you mention renormalization on page 133, is there a factor of omega/2 missing in front of the integral in the renormalized Hamiltonian, or is there something that I'm not seeing?
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In the section where you mention renormalization on page 133, is there a factor of omega/2 missing in front of the integral in the renormalized Hamiltonian, or is there something that I'm not seeing?
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