Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Restoration and Dynamical Breakdown of the \phi \to -\phi Symmetry in
  the (1+1)-dimensional Massive sine-Gordon Field Theory   Within the framework of the Gaussian wave-functional approach, we investigate
the influences of quantum and finite-temperature effects on the
Z_2-symmetry(\phi \to -\phi) of the (1+1)-dimensional massive sine-Gordon field
theory. It is explicitly demonstrated that by quantum effects the Z_2-symmetry
can be restored in one region of the parameter space and dynamically
spontaneously broken in another region. Moreover, a finite-temperature effect
can further restore the Z_2-symmetry only.

20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex