Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three-Fluid Simulations of Relativistic Heavy-Ion Collisions   A relativistic 3-fluid 3D hydrodynamic model has been developed for
describing heavy-ion collisions at incident energies between few and $\sim$ 200
A$\cdot$GeV. In addition to two baryon-rich fluids which simulate mutually
decelerating counterflows of target and projectile nucleons, the new model
incorporates evolution of a third, retarded baryon-free fluid created by this
decelerated baryonic matter. Different equations of state, including those with
the deconfinement phase transition, are treated. A reasonable agreement with
experiment is illustrated by proton rapidity spectra, their dependence on
collision centrality and beam energy.

22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int