Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reduced Lagrangian and Hamiltonian formulations of Euler-Yang-Mills
  fluids   The Lagrangian and Hamiltonian structures for an ideal gauge-charged fluid
are determined. Using a Kaluza-Klein point of view, the equations of motion are
obtained by Lagrangian and Poisson reductions associated to the automorphism
group of a principal bundle. As a consequence of the Lagrangian approach, a
Kelvin-Noether theorem is obtained. The Hamiltonian formulation determines a
non-canonical Poisson bracket associated to these equations.

5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con