First WKB and worldline-instanton calculations of nonlinear trident in time-dependent and spacetime-dependent electric fields, including direct and exchange terms and a Coulomb suppression factor.
Trident pair production in a constant crossed field
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abstract
We isolate the two-step mechanism involving a real intermediate photon from the one-step mechanism involving a virtual photon for the trident process in a constant crossed field. The two-step process is shown to agree with an integration over polarised sub-processes. At low to moderate quantum non-linearity parameter, the one-step process is found to be suppressed. When the parameter is large, the two decay channels are comparable if the field dimensions are not much greater than the formation length.
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Nonlinear trident using WKB and worldline instantons
First WKB and worldline-instanton calculations of nonlinear trident in time-dependent and spacetime-dependent electric fields, including direct and exchange terms and a Coulomb suppression factor.