Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lightening the Dark Matter from its Viscosity and Explanation of EDGES
  Anomaly   We study the visible photon production from the viscous dissipation of the
dark matter (DM) fluid. The visible photon production depends on the magnitude
of the dark matter viscosity and becomes important at the late times. We argue
that for sufficiently large dark matter viscosity, the number of the resonantly
converted visible photons becomes large which populates the Rayleigh-Jeans (RJ)
tails of the Cosmic Microwave Background (CMB) radiation. Consequently, these
excess visible photons possibly can explain the reported EDGES anomaly in the
21 cm signal. Further, we explore the parameter space for which the 21 cm
signal can provide the region to probe the dark radiation and the DM viscosity.

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The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph