Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quark-meson coupling model with constituent quarks: Exchange and pionic
  effects   The binding energy of nuclear matter including exchange and pionic effects is
calculated in a quark-meson coupling model with massive constituent quarks. As
in the case with elementary nucleons in QHD, exchange effects are repulsive.
However, the coupling of the mesons directly to the quarks in the nucleons
introduces a new effect on the exchange energies that provides an extra
repulsive contribution to the binding energy. Pionic effects are not small.
Implications of such effects on observables are discussed.

2
The categories of this paper are: math
1
The categories of this paper are: cs
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc