Canonical quantization of the electromagnetic field in arbitrary \(\xi \)-gauge. (English) Zbl 1540.81172
Summary: We carry out the canonical quantization of the electromagnetic field in arbitrary \(\xi \)-gauge and compute its propagator. In this way we fill a gap in the literature and clarify some existing confusion about Feynman \(\text{i}\epsilon\) prescription for the propagator of the electromagnetic field. We also discuss the BRST quantization and investigate the apparent singularities present in the theory when the gauge parameter \(\xi\) takes the value \(-1\). We find that this is a mere artifact due to the choice of basic modes and show that in the appropriate basis the commutation relations and the BRST transformation are, in fact, independent of the gauge parameter. The latter only appears as the coefficient of a BRST exact term in the Hamiltonian, which constitutes an extremely simple proof of the independence of any physical process on the gauge parameter \(\xi \).
MSC:
| 81V10 | Electromagnetic interaction; quantum electrodynamics |
| 81T10 | Model quantum field theories |
| 81T20 | Quantum field theory on curved space or space-time backgrounds |
| 70S15 | Yang-Mills and other gauge theories in mechanics of particles and systems |
| 58J47 | Propagation of singularities; initial value problems on manifolds |
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