Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dark photon portal into mirror world   Dark photons and mirror matter are well-motivated dark matter candidates. It
is possible that both of them arose during the compactification and symmetry
breaking scenario of the heterotic $E_8\times E_8$ string theory and are
related to each other. In this case, dark photons can become a natural portal
into the mirror world. Unfortunately, the expected magnitude of the induced
interactions of ordinary matter with mirror matter is too small to be of
phenomenological interest.

22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol