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Plasma dynamics and vacuum pair creation using the Dirac-Heisenberg-Wigner formalism
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: 0000-0003-3904-4193
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0003-2716-098x
2021 (English)In: Physical review. E, ISSN 2470-0045, E-ISSN 2470-0053, Vol. 104, no 1, article id 015207Article in journal (Refereed) Published
Abstract [en]

We derive a system of coupled partial differential equations for the equal-time Wigner function in an arbitrary strong electromagnetic field using the Dirac-Heisenberg-Wigner formalism. In the electrostatic limit, we present a system of four coupled partial differential equations, which are completed by Ampères law. This electrostatic system is further studied for two different cases. In the first case, we consider linearized wave propagation in a plasma accounting for the nonzero vacuum expectation values. We then derive the dispersion relation and compare it with well-known limiting cases. In the second case, we consider Schwinger pair production using the local density approximation to allow for analytical treatment. The dependence of the pair production rate on the perpendicular momentum is investigated and it turns out that the spread of the produced pairs along with perpendicular momentum depends on the strength of the applied electric field.

Place, publisher, year, edition, pages
American Physical Society, 2021. Vol. 104, no 1, article id 015207
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:umu:diva-186411DOI: 10.1103/PhysRevE.104.015207ISI: 000674387800007Scopus ID: 2-s2.0-85110430469OAI: oai:DiVA.org:umu-186411DiVA, id: diva2:1582212
Available from: 2021-07-29 Created: 2021-07-29 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, HaidarZamanian, JensBrodin, Gert

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