Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the mode structure of imperfect fluids   This paper tries to obtain a simple picture of several aspects of the mode
structure in relativistic non-equilibrium thermodynamics. Its pedagogical focus
is on the relation between long-wavelength perturbation modes of the causal
M\"{u}ller-Israel-Stewart (MIS) theory and those of the traditional Eckart
theory. Principally, this issue was clarified in a series of papers by Hiscock
and Lindblom (see [8-10]). Here, I put together some essential features which
do not require the entire formalism of the complete theory.

27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs