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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik

MP 8: Quantenfeldtheorie II

MP 8.2: Vortrag

Donnerstag, 20. März 2014, 12:10–12:30, SPA SR125

Justification of the single-mode approximation for the quantum electrodynamics in a strong electromagnetic field — •Oleg Skoromnik¹ and Iliya Feranchuk² — ¹Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, 69117 Heidelberg, Germany — ²Belarusian State University, 4 Nezavisimisty ave., 220030 Minsk, Belarus

The interaction Hamiltonian of an electron and a quasi-monochromatic pulse of a strong quantized electromagnetic field is examined. Canonical transformations of the field variables are found that allows the division of the system's Hamiltonian on two parts. The first one defines the interaction between an electron and a single collective mode of the field. Parameters of this mode correspond to the central lines of the resonant mode in the pulse. The second part describes the field fluctuations relatively to the collective mode. Estimation of the field intensity is found when the effective single-mode Hamiltonian can be used for the system's description.