Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hidden strongly interacting massive particles   We consider dark matter as Strongly Interacting Massive Particles (SIMPs) in
a hidden sector, thermally decoupled from the Standard Model heat bath. Due to
its strong interactions, the number-changing processes of the SIMP lead to its
thermalization at temperature $T_{\rm{D}}$ different from the visible sector
temperature $T$, and subsequent decoupling as the Universe expands. We study
the evolution of the dark SIMP abundance in detail and find that a hidden SIMP
provides for a consistent framework for self-interacting dark matter.
Thermalization and decoupling of a composite SIMP can be treated within the
domain of validity of chiral perturbation theory unlike the simplest
realizations of the SIMP, where the SIMP is in thermal equilibrium with the
Standard Model.

5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int