Pair Production Beyond the Schwinger Formula in Time-Dependent Electric Fields
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We investigate electron-positron pair production in pulse-shaped electric background fields using a non-Markovian quantum kinetic equation. We identify a pulse-length range for subcritical fields still in the nonperturbative regime where the number of produced pairs significantly exceeds that of a naive expectation based on the Schwinger formula. From a conceptual viewpoint, we find a remarkable quantitative agreement between the (real-time) quantum kinetic approach and the (imaginary-time) effective action approach.
5 pages, 3 figures. Typos corrected and references added, PRD Version
5 pages, 3 figures. Typos corrected and references added, PRD Version