Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dark Higgs Dark Matter   A new $U(1)$ dark gauge group coupled to the Standard Model (SM) via the
kinetic mixing portal provides a natural dark matter candidate in the form of
the Higgs field, $h_d$, responsible for generating the mass of the dark photon,
$\gamma_d$. We show that the condition $m_{h_d}\leq m_{\gamma_d}$, together
with smallness of the kinetic mixing parameter, $\epsilon$, and/or dark gauge
coupling, $g_d$, leads the dark Higgs to be sufficiently metastable to
constitute dark matter. We analyze the Universe's thermal history and show that
both freeze-in, ${\rm SM}\to \{\gamma_d, h_d\}$, and freeze-out, $ \{\gamma_d,
h_d\} \to {\rm SM}$, processes can lead to viable dark Higgs dark matter with a
sub-GeV mass and a kinetic mixing parameter in the range
$10^{-13}\lesssim\epsilon\lesssim10^{-6}$. Observable signals in astrophysics
and cosmology include modifications to primordial elemental abundances, altered
energetics of supernovae explosions, dark Higgs decays in the late Universe,
and dark matter self-interactions.

19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph