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Physics  2003 

Fermion production in time-dependent fields

DOI: 10.1103/PhysRevD.68.105005

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The exact fermion propagator in a classical time-dependent gauge field is derived by solving the equation of motion for the Dirac Green's functions. From the retarded propagator obtained in this way the momentum spectrum for the produced fermion pairs is calculated. Different approximations and the exact solution for the propagator and the momentum spectrum are presented.


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