Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collective phenomena in ultra-relativistic nuclear collisions:
  anisotropic flow and more   Many features of multiparticle production in ultra-relativistic nuclear
collisions reflect the collision geometry and other collision characteristics
determining the initial conditions. As the initial conditions affect to a
different degree all the particles, it leads to truly multiparticle effects
often referred to as anisotropic collective flow. Studying anisotropic flow in
nuclear collisions provides unique and invaluable information about the system
evolution and the physics of multiparticle production in general. Being not
able to cover all aspects of anisotropic flow in one lecture, I decided in the
first part of the lecture to discuss briefly a few important and established
results, and in the second part, to focus, in a little more detail, on one
recent development -- a recent progress in our understanding of the role of
fluctuations in the initial conditions. I also discuss some future measurements
that might reveal further details of the multiparticle production processes.

13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph