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Nonlinear wave interaction and spin models in the magnetohydrodynamic regime
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- Brodin, Gert (författare)
- Umeå universitet,Institutionen för fysik
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- Lundin, Joakim (författare)
- Umeå universitet,Institutionen för fysik
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- Zamanian, Jens, 1982- (författare)
- Umeå universitet,Institutionen för fysik
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- Stefan, Martin (författare)
- Umeå universitet,Institutionen för fysik
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(creator_code:org_t)
- 2011-08-12
- 2011
- Engelska.
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Ingår i: New Journal of Physics. - Bristol, UK : Institute of Physics Pub.. - 1367-2630. ; 13:August, s. 083017-08331
- Relaterad länk:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Here we consider the influence on the electron spin in the magnetohydrodynamic (MHD) regime. Recently developed models that include spin-velocity correlations are taken as the starting point. A theoretical argument is presented, suggesting that in the MHD regime a single-fluid electron model with spin correlations is equivalent to a model with spin-up and spin-down electrons constituting different fluids, but where the spin-velocity correlations are omitted. Three-wave interaction of two shear Alfven waves and a compressional Alfven wave is then taken as a model problem to evaluate the asserted equivalence. The theoretical argument turns out to be supported, because the predictions of the two models agree completely. Furthermore, the three-wave coupling coefficients obey the Manley-Rowe relations, which further support the soundness of the models and the validity of the assumptions made in the derivation. Finally, we point out that the proposed two-fluid model can be incorporated in standard particle-in-cell schemes with only minor modifications.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- Non-linear dynamics, chaos
- Icke-linjär dynamik, kaos
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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