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Front-form approach to quantum electrodynamics in an intense plane-wave field with an application to the vacuum polarization

Bragin, Sergey

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Abstract

Quantum electrodynamics in an intense plane-wave field is considered within the framework of light-cone quantization. In this context, high-energy vacuum birefringence and dichroism in an intense laser field are investigated. In particular, a setup is analyzed, in which probe gamma photons are generated via Compton backscattering, propagate through an intense laser pulse, and are subsequently detected via pair production in matter. The polarization of the photon beam is characterized by the Stokes parameters, and their change due to vacuum birefringence and dichroism is determined. The magnitude of the polarization effects is assessed for upcoming high-power laser facilities. Optimal parameters and regimes are identified, and the required statistics and the duration of the experiment in order to confirm the prediction of quantum electrodynamics are estimated. Furthermore, an approach for the treatment of the bispinor part of scattering amplitudes in a plane-wave field is introduced. Simplified expressions for the vertex functions, arising from the interaction terms of the lightfront Hamiltonian, are obtained. It is demonstrated that with the developed technique the evaluation of the gamma-matrix traces for scattering in an external plane-wave field can be performed in a relatively straightforward way and the final results can be written in a compact form.

Item Type: Dissertation
Supervisor: Di Piazza, PD Dr. Antonino
Place of Publication: Heidelberg
Date of thesis defense: 28 May 2019
Date Deposited: 19 Jul 2019 15:14
Date: 2019
Faculties / Institutes: Service facilities > Graduiertenschulen > Graduiertenschule Fundamentale Physik (HGSFP)
Service facilities > Max-Planck-Institute allgemein > MPI for Nuclear Physics
Subjects: 530 Physics
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