Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Heavy Nuclei from RHIC to the Cosmos   Ultra-relativistic heavy ion collisions produce a high-temperature,
thermalized system that may mimic the conditions present shortly after the big
bang. This writeup will given an overview of early results from the
Relativistic Heavy Ion Collider (RHIC), and discuss what we have learned about
hot, strongly interacting nuclear systems. The thermal and chemical composition
of the system will be discussed, along with observables that are sensitive to
the early evolution of the system. I will also discuss the implications of the
RHIC results for cosmic ray air showers.

23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin