Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Statistical field theory for simple fluids: the collective variables
  representation   An alternative representation of an exact statistical field theory for simple
fluids, based on the method of collective variables, is presented. The results
obtained are examined from the point of another version of theory that was
developed recently by performing a Hubbard-Stratonovich transformation of the
configurational Boltzmann factor [J.-M. Caillol, Mol. Phys. 101 (2003) 1617].
The analytical expressions for the pressure and the free energy are derived in
two-loop approximation for both versions of theory and it is shown that they
are indeed equivalent.The results yield a new type approximation within an
untested approximation scheme.

31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph