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Linear pair-creation damping of high-frequency plasma oscillation
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.ORCID-id: 0000-0002-1555-7616
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.ORCID-id: 0000-0003-2716-098x
2022 (Engelska)Ingår i: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 29, nr 4, artikel-id 042106Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
American Institute of Physics (AIP), 2022. Vol. 29, nr 4, artikel-id 042106
Nationell ämneskategori
Fusion, plasma och rymdfysik Den kondenserade materiens fysik
Identifikatorer
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
Tillgänglig från: 2022-05-04 Skapad: 2022-05-04 Senast uppdaterad: 2023-05-08Bibliografiskt granskad
Ingår i avhandling
1. Modelling and analyzing strong-field effects in quantum plasma
Öppna denna publikation i ny flik eller fönster >>Modelling and analyzing strong-field effects in quantum plasma
2023 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Alternativ titel[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.

Ort, förlag, år, upplaga, sidor
Umeå: Umeå University, 2023. s. 69
Nyckelord
Plasma physics, Strong-field physics, Kinetic theory, Quantum plasma
Nationell ämneskategori
Fusion, plasma och rymdfysik
Forskningsämne
fysik
Identifikatorer
urn:nbn:se:umu:diva-208019 (URN)978-91-8070-067-2 (ISBN)978-91-8070-068-9 (ISBN)
Disputation
2023-06-01, NAT.D.450, Förvaltningshuset Hus D, 901 87, Umeå, 13:00 (Engelska)
Opponent
Handledare
Forskningsfinansiär
Vetenskapsrådet, 2016-03806
Tillgänglig från: 2023-05-11 Skapad: 2023-05-08 Senast uppdaterad: 2023-05-10Bibliografiskt granskad

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Al-Naseri, HaidarBrodin, Gert

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Physics of Plasmas
Fusion, plasma och rymdfysikDen kondenserade materiens fysik

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