Diffraction at a time grating in electron-positron pair creation from vacuum
arXiv:1807.05386 · doi:10.1103/PhysRevD.98.056009
Abstract
The Sauter-Schwinger process of electron-positron pair creation from vacuum, driven by a sequence of time-dependent electric-field pulses, is studied in the framework of quantum-field theoretical approach. As demonstrated by our numerical results, the probability distributions of produced pairs exhibit intra- and inter-pulse interference structures. We show that such structures can be observed beyond the regime of applicability of the WKB theory, which was the focus of earlier investigations. Going beyond these developments, we perform the analysis of the time-evolution operator for an arbitrary eigenmode of the fermionic field. This shows that a perfect coherent enhancement of the inter-pulse peaks can never be reached. A nearly perfect coherence, on the other hand, is due to nonadiabatic transitions at avoided crossings of the phases defining the unitary time evolution. This analysis allows us to determine the conditions under which the nearly perfect coherence is lost.
arXiv comment13 pages, 6 figures
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- Threshold effects in electron-positron pair creation from the vacuum: Stabilization and longitudinal vs transverse momentum sharing
- Electron-positron pair creation in the superposition of two oscillating electric field pulses with largely different frequency, duration and relative positioning
- Unitary vs pseudo-unitary time evolution and statistical effects in the dynamical Sauter-Schwinger process
- Vortex Structures and Momentum Sharing in Dynamic Sauter-Schwinger Process
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