Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The QCD equation of state and quark star properties   We review our quasiparticle model for the thermodynamics of strongly
interacting matter at high temperature, and its extrapolation to non-zero
chemical potential. Some implications of the resulting soft equation of state
of quark matter at low temperatures are pointed out.

2
The categories of this paper are: math
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin