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An effective action approach to photon propagation on a magnetized background
Umeå University, Faculty of Science and Technology, Department of Physics.
2009 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 87, no 3, 31001-31005 p.Article in journal (Refereed) Published
Abstract [en]

A new explicit analytical form of the dispersion relation for photon propagation in the presence of a strong background magnetic field is derived within the effective action framework. The dispersion relation is expressed in terms of well-known special functions, and the treatment is exact within the linearization procedure, the one-loop approximation, and the soft photon approximation. The results are incorporated in a kinetic spin plasma description for the purpose of studying quantum electrodynamical effects of strongly magnetized plasmas. The results are applied to astrophysical examples.

Place, publisher, year, edition, pages
IOP Publishing , 2009. Vol. 87, no 3, 31001-31005 p.
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-29845DOI: 10.1209/0295-5075/87/31001OAI: oai:DiVA.org:umu-29845DiVA: diva2:278285
Available from: 2009-11-25 Created: 2009-11-25 Last updated: 2017-12-12Bibliographically approved
In thesis
1. QED and collective effects in vacuum and plasmas
Open this publication in new window or tab >>QED and collective effects in vacuum and plasmas
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The theory of quantum electrodynamics (QED) was born out of an attempt to merge Einsteins theory of special relativity and quantum mechanics. Einsteins energy/mass equivalence together with Heisenberg's uncertainty principle allows for particle pairs to be spontaneously created and annihilated in vacuum. These spontaneous fluctuations gives the quantum vacuum properties analogous to that of a nonlinear medium. Although these fluctuations in general does not give note of themselves, effects due to their presence can be stimulated or enhanced through external means, such as boundary conditions or electromagnetic fields. Whereas QED has been very well tested in the high-energy, low-intensity regime using particle accelerators, the opposite regime where the photon energy is low but instead the intensity is high is still to a large degree not investigated. This is expected to change with the rapid progress of modern high-power laser-systems.

In this thesis we begin by studying the QED effect of photon-photon scattering. This process has so far not been successfully verified experimentally, but we show that this may change already with present day laser powers. We also study QED effects due to strong magnetic fields. In particular, we obtain an analytical description for vacuum birefringence valid at arbitrary field strengths. Astrophysics already offer environments where QED processes may be influential, e.g. in neutron star and magnetar environments. For astrophysical purposes we investigate how effects of QED can be implemented in plasma models. In particular, we study QED dispersive effects due to weak rapidly oscillating fields, nonlinear effects due to slowly varying strong fields, as well as QED effects in strongly magnetized plasmas. Effects of quantum dispersion and the electron spin has also been included in an extended plasma description, of particular interest for dense and/or strongly magnetized systems.

Place, publisher, year, edition, pages
Umeå: Umeå universitet. Institutionen för fysik, 2010. 59 p.
Keyword
QED, quantum electrodynamics, quantum plasmas, quantum vacuum
National Category
Fusion, Plasma and Space Physics
Research subject
Physics
Identifiers
urn:nbn:se:umu:diva-35615 (URN)978-91-7264-972-9 (ISBN)
Public defence
2010-09-22, MIT-huset, MA121, Umeå universitet, Umeå, 13:00 (English)
Opponent
Supervisors
Available from: 2010-09-01 Created: 2010-08-26 Last updated: 2010-09-01Bibliographically approved

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Publisher's full texthttp://www.iop.org/EJ/article/0295-5075/87/3/31001/epl_87_3_31001.html

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