Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Entropy production in high-energy heavy-ion collisions and the
  correlation of shear viscosity and thermalization time   We study entropy production in the early stage of high-energy heavy-ion
collisions due to shear viscosity. We employ the second-order theory of
Israel-Stewart with two different stress relaxation times, as appropriate for
strong coupling or for a Boltzmann gas, respectively, and compare the
hydrodynamic evolution. Based on present knowledge of initial particle
production, we argue that entropy production is tightly constrained. We derive
new limits on the shear viscosity to entropy density ratio $\eta/s$,
independent from elliptic flow effects, and determine the corresponding
Reynolds number. Furthermore, we show that for a given entropy production
bound, that the initial time $\tau_0$ for hydrodynamics is correlated to the
viscosity. The conjectured lower bound for $\eta/s$ provides a lower limit for
$\tau_0$.

35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
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
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio