Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Density Dependence of Nucleon Bag Constant, Radius and Mass in an
  Effective Field Theory Model of QCD   With the global color symmetry model (GCM) being extended to finite chemical
potential, the density dependence of the bag constant, the total energy and the
radius of a nucleon, as well as the quark condensate in nuclear matter are
investigated. A maximal nuclear matter density for the existence of the bag
with three quarks confined within is obtained. The calculated results indicate
that, before the maximal density is reached, the bag constant, the total energy
of a nucleon and the quark condensate decrease gradually, and the radius of a
nucleon increases, with the increasing of the nuclear matter density.
Nevertheless no sudden change emerges. As the maximal nuclear matter density is
reached, a phase transition from nucleons to quarks takes place and the chiral
symmetry is restored.

17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph