Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the existence of solutions and causality for relativistic viscous
  conformal fluids   We consider a stress-energy tensor describing a pure radiation viscous fluid
with conformal symmetry introduced in arXiv:1708.06255. We show that the
corresponding equations of motions are causal in Minkowski background and also
when coupled to Einstein's equations, and solve the associated initial-value
problem.

34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th