Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hybrid approaches to heavy ion collisions and future perspectives   We present the current status of hybrid approaches to describe heavy ion
collisions and their future challenges and perspectives. First we present a
hybrid model combining a Boltzmann transport model of hadronic degrees of
freedom in the initial and final state with an optional hydrodynamic evolution
during the dense and hot phase. Second, we present a recent extension of the
hydrodynamical model to include fluctuations near the phase transition by
coupling a chiral field to the hydrodynamic evolution.

22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
3
The categories of this paper are: physics
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int