Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gauge Invariance and Hall Terms in the Quasiclassical Equations of
  Superconductivity   This paper presents a careful derivation of the quasiclassical equations of
superconductivity so that a manifest gauge invariance is retained with respect
to the space-time arguments of the quasiclassical Green's function $\hat{g}$.
The terms responsible for the Hall effect naturally appear from the derivation.
The equations are applicable to clean as well as dirty superconductors for an
arbitrary external frequency much smaller than the Fermi energy. Thus, they
will form a basis toward a complete microscopic understanding of the Hall
effect in type-II superconductors.

30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org