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Linear pair-creation damping of high-frequency plasma oscillation
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-1555-7616
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0003-2716-098x
2022 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 29, no 4, article id 042106Article in journal (Refereed) Published
Abstract [en]

We have studied the linear dispersion relation for Langmuir waves in plasmas of very high density, based on the Dirac-Heisenberg-Wigner formalism. The vacuum contribution to the physical observables leads to ultraviolet divergences, which are removed by a charge renormalization. The remaining vacuum contribution is small and is in agreement with previously derived expressions for the time-dependent vacuum polarization. The main new feature of the theory is a damping mechanism similar to Landau damping, but where the plasmon energy gives rise to creation of electron-positron pairs. The dependence of the damping rate (pair-creation rate) on the wavenumber, temperature, and density is analyzed. Finally, the analytical results of linearized theory are compared with numerical solutions.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2022. Vol. 29, no 4, article id 042106
National Category
Fusion, Plasma and Space Physics Condensed Matter Physics
Identifiers
URN: urn:nbn:se:umu:diva-194333DOI: 10.1063/5.0087085ISI: 000788793900002Scopus ID: 2-s2.0-85128402117OAI: oai:DiVA.org:umu-194333DiVA, id: diva2:1655930
Available from: 2022-05-04 Created: 2022-05-04 Last updated: 2023-05-08Bibliographically approved
In thesis
1. Modelling and analyzing strong-field effects in quantum plasma
Open this publication in new window or tab >>Modelling and analyzing strong-field effects in quantum plasma
2023 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Modellering och analys av effekter från starka fält i kvantkinetiska plasmor
Abstract [en]

Under the extreme conditions that can be found around dense stars and in the accretion discs of black holes, several strong-field quantum phenomena dominate the dynamics of the plasma. This includes the creation of matter and anti-matter from the vacuum (Schwinger mechanism), radiation reaction and Landau quantization. Some of these strong field phenomena were presented theoretically a century ago but have never been verified in experiments due to the difficulty of creating the required extreme conditions in the lab. However, with the development of laser facilities in the past decades, it will be possible to observe several extreme physical phenomena in the near future. To conduct experiments on these extreme phenomena, theoretical simulations need to be constructed as a guide for optimizing experiments.

This thesis is concerned with developing and analyzing strong field phenomena in kinetic plasma models. The focus is to extend current kinetic models to include several physical phenomena that are relevant to future experiments on laser-plasma interaction. In particular, a kinetic theory based on the Wigner transformation of the Dirac equation has been analyzed in different regimes. This kinetic model is used to study the plasma dynamics at the Schwinger limit, where collective plasma effects and several quantum processes are studied.

Place, publisher, year, edition, pages
Umeå: Umeå University, 2023. p. 69
Keywords
Plasma physics, Strong-field physics, Kinetic theory, Quantum plasma
National Category
Fusion, Plasma and Space Physics
Research subject
Physics
Identifiers
urn:nbn:se:umu:diva-208019 (URN)978-91-8070-067-2 (ISBN)978-91-8070-068-9 (ISBN)
Public defence
2023-06-01, NAT.D.450, Förvaltningshuset Hus D, 901 87, Umeå, 13:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council, 2016-03806
Available from: 2023-05-11 Created: 2023-05-08 Last updated: 2023-05-10Bibliographically approved

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Al-Naseri, HaidarBrodin, Gert

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