Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gauge theory on $Z_2 \times Z_2 \ti Z_2 $ Discrete Group and a
  Spontaneous $CP$ Violation Toy Model   In the spirit of Non-commutative differential calculus on discrete group, we
construct a toy model of spontaneous $CP$ violation (SCPV). Our model is
different from the well-known Weinberg-Branco model although it involves three
Higgs doublets and preserve neutral flavor current conservation (NFC) after
using the $Z_2 \ti Z_2 \ti Z_2$ discrete symmetry and imposing some constraints
on Yukawa couplings.

25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph