Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Progress in Understanding the Nuclear Equation of State at the Quark
  Level   At the present time there is a lively debate within the nuclear community
concerning the relevance of quark degrees of freedom in understanding nuclear
structure. We outline the key issues and review the impressive progress made
recently within the framework of the quark-meson coupling model. In particular,
we explain in quite general terms how the modification of the internal
structure of hadrons in-medium leads naturally to three- and four-body forces,
or equivalently, to density dependent effective interactions.

31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph