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Results tagged with quantum-electrodynamics
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user 325017
Quantum electrodynamics (QED) is the quantum field theory believed to describe electromagnetic interaction. It is the simplest example of a quantum gauge theory, where the gauge group is abelian, U(1).
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Vacuum polarisation in QED - why is it significant to renormalisation?
I have followed along for the derivation of the amplitude of the 2-photon vacuum polarisation and the book says the result is important for the renormalisation of QED, why is this?
- 213k
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How many different diagrams contribute to the two-photon amplitude in QED?
I can only think of this particular diagram, though there must be more as I believe the amplitude is supposed to be equal to 0, as it is used to highlight renormalisation in QED.
Which other processe …
- 23k