Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Heavy-Ion Collisions toward High-Density Nuclear Matter   In the present paper, the current efforts in heavy-ion collisions toward
high-density nuclear matter will be discussed. First, the essential points
learned from RHIC and LHC will be reviewed. Then, the present data from the
STAR Beam Energy Scan are discussed. Finally, the current efforts, NICA, FAIR,
HIAF, and J-PARC-HI (heavy ion) are described. In particular, the efforts of
the J-PARC-HI project are described in detail.

2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg