A Basis of Casimirs in 3D Magnetohydrodynamics
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Abstract We prove that any regular Casimir in 3D magnetohydrodynamics (MHD) is a function of the magnetic helicity and cross-helicity. In other words, these two helicities are the only independent regular integral invariants of the coadjoint action of the MHD group $\textrm{SDiff}(M)\ltimes \mathfrak X^*(M)$, which is the semidirect product of the group of volume-preserving diffeomorphisms and the dual space of its Lie algebra.
2015 ◽
Vol 2015
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pp. 1-9
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2009 ◽
Vol 06
(04)
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pp. 555-572
2015 ◽
Vol 48
(17)
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pp. 175501
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1985 ◽
Vol 37
(1)
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pp. 122-140
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2012 ◽
Vol 16
(3)
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pp. 859-872
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1998 ◽
Vol 09
(05)
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pp. 599-621
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2020 ◽
Vol 17
(1)
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pp. 100-108