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Quantum Electrodynamics with External Field Breaking
Transition Processes in the External Field Breaking the Stability of Vacuum
The Problem of Mean Values in Quantum Electrodynamics with Unstable Vacuum
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A. I. Nikishov annihilation operators antiparticles arbitrary number breaking the stability causal propagator coincides compute consider constant uniform field contour corresponding creation and annihilation D. M. Gitman Dc x,x defined density matrix Dirac equation E. S. Fradkin electric field electromagnetic field electron expression external electromagnetic field external field Feynman diagrams field operators formulas Green functions Hamiltonian Klein-Gordon equation magnetic field mean value normal form number of pairs number of particles obtain one-electron overall probability overall radiation probability pair creation perturbation theory photon photon with momentum Phys plane wave field polarization positrons quantity quantum electrodynamics quantum field theory quantum numbers radiative interaction radiative perturbation theory relations relative probability amplitudes Russian S. P. Gavrilov s)ds Scalar QED Shvartsman solutions stability of vacuum Substituting total number unitarity unstable vacuum V. I. Ritus V. S. Popov variables vectors Vuzov zero-order processes ZhETF