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Short wavelength quantum electrodynamical correction to cold plasma-wave propagation
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
2006 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 13, no 10, 102102-102107 p.Article in journal (Refereed) Published
Abstract [en]

The effect of short wavelength quantum electrodynamic (QED) correction on plasma-wave propagation is investigated. The effect on plasma oscillations and on electromagnetic waves in an unmagnetized as well as a magnetized plasma is investigated. The effects of the short wavelength QED corrections are most evident for plasma oscillations and for extraordinary modes. In particular, the QED correction allow plasma oscillations to propagate, and the extraordinary mode loses its stop band. The significance of our results is discussed.

Place, publisher, year, edition, pages
American Institute of Physics , 2006. Vol. 13, no 10, 102102-102107 p.
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-11967DOI: 10.1063/1.2356315OAI: oai:DiVA.org:umu-11967DiVA: diva2:151638
Available from: 2007-03-17 Created: 2007-03-17 Last updated: 2017-12-14Bibliographically 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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