Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On cold gases with anisotropic interactions   A cold gas of particles with anisotropic interactions of general form, due to
a polarizing field, is studied. Special cases are atoms or molecules with
dipole-dipole or quadrupole-quadrupole interactions. It is shown that the
angular dependence of an observable on the direction of the polarizing field is
largely determined by symmetry. For a gas in a confined quasi two-dimensional
geometry, the effective interaction is calculated in general form. Some
examples of dipole and quadrupole gases are considered. It is concluded that
when anisotropic forces are studied in a general manner, one can obtain simpler
results and better understanding for some problems.

32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th