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Proceedings Paper

Improved local constant-field approximation for strong-field QED codes (Conference Presentation)
Author(s): Antonino Di Piazza

Paper Abstract

The local-constant-field approximation (LCFA) is an essential theoretical tool for investigating strong-field QED phenomena in background electromagnetic fields with complex spacetime structure. In [1] we have analyzed the shortcomings of the LCFA in nonlinear Compton scattering for the case of a background plane-wave field. Here, we generalize that analysis to background fields, which can feature a virtually arbitrary spacetime structure [2]. In addition, we provide an explicit and simple implementation of an improved expression of the nonlinear Compton scattering differential probability that solves the main shortcomings of the standard LCFA, and is suitable for background electromagnetic fields with arbitrary spacetime structure such as those of particle-in-cell (PIC) codes. Finally, we carry out a systematic procedure to calculate the probability of nonlinear Compton scattering per unit of emitted photon light-cone energy and of nonlinear Breit-Wheeler pair production per unit of produced positron light-cone energy beyond the LCFA in a plane-wave background field, which allows us to identify the limits of validity of this approximation quantitatively. [1] A. Di Piazza, M. Tamburini, S. Meuren, and C. H. Keitel, Phys. Rev. A vol. 98, 012134 (2018) [2] A. Di Piazza, M. Tamburini, S. Meuren, and C. H. Keitel, arXiv:1811.05834

Paper Details

Date Published: 14 May 2019
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Proc. SPIE 11039, Research Using Extreme Light: Entering New Frontiers with Petawatt-Class Lasers IV, 1103906 (14 May 2019); doi: 10.1117/12.2525076
Show Author Affiliations
Antonino Di Piazza, Max-Planck-Institut für Kernphysik (Germany)


Published in SPIE Proceedings Vol. 11039:
Research Using Extreme Light: Entering New Frontiers with Petawatt-Class Lasers IV
Georg Korn; Luis O. Silva, Editor(s)

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