Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Viscosity and thermodynamic properties of QGP in relativistic heavy ion
  collisions   We study the viscosity and thermodynamic properties of QGP at RHIC by
employing the recently extracted equilibrium distribution functions from two
hot QCD equations of state of $O(g^5)$ and $O(g^6\ln(1/g))$ respectively. After
obtaining the temperature dependence of energy density, and entropy density, we
focus our attention on the determination of shear viscosity for a rapidly
expanding interacting plasma, as a function of temperature. We find that
interactions significantly decrease the shear viscosity. They decrease the
viscosity to entropy density ratio, $\eta/{\mathcal S}$ as well.

21
The categories of this paper are: adap-org
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
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
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph