Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-04-14
Phys.Rev.Lett.104:250402,2010
Physics
High Energy Physics
High Energy Physics - Theory
5 pages, 4 figs.; v2 sign typo corrected, version to appear in PRL
Scientific paper
10.1103/PhysRevLett.104.250402
Particle production due to external fields (electric, chromo-electric or gravitational) requires evolving an initial state through an interaction with a time-dependent background, with the rate being computed from a Bogoliubov transformation between the in and out vacua. When the background fields have temporal profiles with sub-structure, a semiclassical analysis of this problem confronts the full subtlety of the Stokes phenomenon: WKB solutions are only local, while the production rate requires global information. Incorporating the Stokes phenomenon, we give a simple quantitative explanation of the recently computed [Phys. Rev. Lett. 102, 150404 (2009)] oscillatory momentum spectrum of e+e- pairs produced from vacuum subjected to a time-dependent electric field with sub-cycle laser pulse structure. This approach also explains naturally why for spinor and scalar QED these oscillations are out of phase.
Dumlu Cesim K.
Dunne Gerald V.
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