Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhancement of quark number susceptibility with an alternative pattern
  of chiral symmetry breaking in dense matter   We explore a possible phase where chiral $SU(2)_L \times SU(2)_R$ symmetry is
spontaneously broken while its center $Z_2$ symmetry remains unbroken and its
consequence on thermal quantities. In this phase, chiral symmetry breaking is
driven by a quartic quark condensate although a bilinear quark condensate
vanishes. A Ginzburg-Landau free energy leads to a new tricritical point (TCP)
between the $Z_2$ broken and unbroken phases. Furthermore, a critical point can
appear even in the chiral limit where explicit breaking is turned off, instead
of a TCP at which restoration of chiral and its center symmetries takes place
simultaneously. The net quark number density exhibits an abrupt change near the
restoration of the center symmetry rather than that of the chiral symmetry.
Hadron masses in possible phases are also studied in a linear sigma model. We
show that, in the $Z_2$ symmetric phase, the $\bar{q}q$-type scalar meson with
zero isospin I=0 splits from the $\bar{q}q$-type pseudoscalar meson with I=1.

11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio