Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Energy-conserving Finite-beta Electromagnetic Drift-fluid Equations   Nonlinear energy-conserving drift-fluid equations that are suitable to
describe self-consistent finite-beta low-frequency electromagnetic
(drift-Alfven) turbulent fluctuations in a nonuniform, anisotropic, magnetized
plasma are derived from a variational principle. The variational principle is
based on a drift-fluid Lagrangian that contains linear and nonlinear E x B
velocities derived directly from the corresponding single-particle finite-beta
gyrocenter Hamiltonian (in the zero-Larmor-radius limit). Covariant
electromagnetic effects introduce a magnetic generalization to the standard ion
polarization density as well as introduce a new ion magnetization current,
which are both missing from existing gyrofluid and drift-fluid Poisson-Ampere
equations. An exact energy conservation law is also derived directly from the
drift-fluid Lagrangian by application of the Noether method.

30
The categories of this paper are: q-alg
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph