Pair production in spacetime-dependent fields using WKB-like techniques

Johannes Oertel
The WKB method, well-known from quantum mechanics, has been sucessfully applied to the problem of non-perturbative pair production in time-dependent background fields, such as in cosmological particle creation or in the Sauter-Schwinger effect, i.e. particle creation due to a strong electromagnetic field. It can be used to calculate the pair production probability for a wide range of field profiles and to obtain the momentum spectrum of the produced pairs as well. We present a perturbative...
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