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Applicability of the Klein-Gordon equation for pair production in vacuum and plasma
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
2023 (Engelska)Ingår i: Physical review. E, ISSN 2470-0045, E-ISSN 2470-0053, Vol. 108, nr 5, artikel-id 055205Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In this paper, a phase-space description of electron-positron pair-creation will be applied, based on a Wigner transformation of the Klein-Gordon equation. The resulting theory is similar in many respects to the equations from the Dirac-Heisenberg-Wigner formalism. However, in the former case, all physics related to particle spin is neglected. In the present paper we compare the pair-production rate in vacuum and plasmas, with and without spin effects, in order to evaluate the accuracy and applicability of the spinless approximation. It is found that for modest frequencies of the electromagnetic field, the pair production rate of the Klein-Gordon theory is a good approximation to the Dirac theory, provided the matter density is small enough for Pauli blocking to be neglected, and a factor of two related to the difference in the vacuum energy density is compensated for.  

Ort, förlag, år, upplaga, sidor
American Physical Society, 2023. Vol. 108, nr 5, artikel-id 055205
Nationell ämneskategori
Fusion, plasma och rymdfysik
Forskningsämne
fysik
Identifikatorer
URN: urn:nbn:se:umu:diva-208015DOI: 10.1103/PhysRevE.108.055205Scopus ID: 2-s2.0-85177615325OAI: oai:DiVA.org:umu-208015DiVA, id: diva2:1755339
Forskningsfinansiär
Knut och Alice Wallenbergs Stiftelse
Anmärkning

Originally included in thesis in manuscript form. 

Tillgänglig från: 2023-05-08 Skapad: 2023-05-08 Senast uppdaterad: 2023-11-30Bibliografiskt 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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