Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Variational approach to low-frequency kinetic-MHD in the current
  coupling scheme   Hybrid kinetic-MHD models describe the interaction of an MHD bulk fluid with
an ensemble of hot particles, which is described by a kinetic equation. When
the Vlasov description is adopted for the energetic particles, different
Vlasov-MHD models have been shown to lack an exact energy balance, which was
recently recovered by the introduction of non-inertial force terms in the
kinetic equation. These force terms arise from fundamental approaches based on
Hamiltonian and variational methods. In this work we apply Hamilton's
variational principle to formulate new current-coupling kinetic-MHD models in
the low-frequency approximation (i.e. large Larmor frequency limit). More
particularly, we formulate current-coupling hybrid schemes, in which energetic
particle dynamics are expressed in either guiding-center or gyrocenter
coordinates.

25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex