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- W2081121467 abstract "The conventional formulation of quantum electrodynamics in which the system develops from one space-like hyperplane to the next is here replaced by one in which the development proceeds over null hyperplanes. For detailed study a quantized electromagnetic field ${A}^{ensuremath{mu}}$ is chosen to interact with a quantized spin-0 particle field $ensuremath{Phi}$ in an unquantized electromagnetic field $A_{mathrm{ext}}^{}{}_{}{}^{ensuremath{mu}}$ as background. If the latter is chosen to be a laser field, the $ensuremath{Phi}ensuremath{-}A_{mathrm{ext}}^{}{}_{}{}^{ensuremath{mu}}$ interaction permits exact closed-form solutions (Volkov) and allows the construction of wave packets which cannot be done in the usual formulation. The perturbation solution for the $S$ matrix is therefore conveniently based on the Furry picture. The null-plane formulation has various advantages. In particular, the gauge problem which causes difficulties in the usual theory is absent in the null-plane gauge chosen here. Since there are only two dynamically independent components of ${A}^{ensuremath{mu}}$, the commutation relations, field equations, gauge conditions, and vacuum definition are all mutually consistent. A natural nullplane gauge is used. Similarities and differences between this and the conventional theory are pointed out. As an application the Compton scattering of a charged particle with a laser beam is shown to lead to an intensity-dependent frequency shift. The controversy on this issue is settled here without divergent phase factors, because our wave-packet description permits a clean separation of the particle beam from the laser." @default.
- W2081121467 created "2016-06-24" @default.
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- W2081121467 date "1971-04-15" @default.
- W2081121467 modified "2023-09-26" @default.
- W2081121467 title "Quantum Electrodynamics on Null Planes and Applications to Lasers" @default.
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- W2081121467 doi "https://doi.org/10.1103/physrevd.3.1692" @default.
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