Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spontaneous CP violation in the 2HDM: physical conditions and the
  alignment limit   For the general Two-Higgs-Doublet model, we present conditions for having
spontaneous CP violation, in terms of physical masses and couplings. These
relations involve the charged-Higgs mass, its cubic couplings with neutral
scalars and quartic coupling, and become particularly simple in the alignment
limit. In the simplified model with softly broken $Z_2$ symmetry, some
deviation from alignment is required for spontaneous CP violation to be
present.

5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph