Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Is the electromagnetic field a source of a mediating field in hidden
  sector?   We continue the discussion of a proposed model of hidden sector of the
Universe, consisting of sterile spin-1/2 Dirac fermions ("sterinos"), sterile
spin-0 bosons ("sterons") with spontaneously nonzero vacuum expectation value,
and sterile nongauge mediating bosons ("A bosons") described by an
antisymmetric-tensor field (of dimension one). The Standard-Model
electromagnetic field (of dimension two) multiplied by the steron vacuum
expectation value becomes in a spontaneous way a source of A-boson field
mediating new weak interactions in hidden sector and providing - due to the
action of electromagnetic field in both sectors - a weak coupling between
hidden and Standard-Model sectors ("photonic portal"). The proposed photonic
portal emphasizes even more the role of electromagnetic field in the structure
of the Universe.

24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an