Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Light-Scattering by Longitudinal phonons in Supercooled Molecular
  Liquids II: Microscopic Derivation of the Phenomenological Equations   The constitutive equations for the orientational dynamics of a liquid formed
of linear molecules are derived microscopically. The resulting generalised
Langevin equations coincide with the phenomenological approach of Dreyfus et
al. Formally exact expressions are given for the phenomenological coefficients
and various constraints are shown to be consequences of this microscopic
approach.

29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg