The fixed-background-field approximation of QED is re-expressed as full QED evaluated between asymptotic photon coherent states, with background time-dependence arising from picture choice rather than an explicitly time-dependent Hamiltonian.
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Coherent-field QED transitions based on coherent-state boundary conditions
The fixed-background-field approximation of QED is re-expressed as full QED evaluated between asymptotic photon coherent states, with background time-dependence arising from picture choice rather than an explicitly time-dependent Hamiltonian.