Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraints on dark matter interactions with standard model particles
  from CMB spectral distortions   We propose a new method to constrain elastic scattering between dark matter
(DM) and standard model particles in the early Universe. Direct or indirect
thermal coupling of non-relativistic DM with photons leads to a heat sink for
the latter. This results in spectral distortions of the cosmic microwave
background (CMB), the amplitude of which can be as large as a few times the
DM-to-photon number ratio. We compute CMB spectral distortions due to
DM-proton, DM-electron and DM-photon scattering for generic energy-dependent
cross sections and DM mass m_DM >~ 1 keV. Using FIRAS measurements we set
constraints on the cross sections for m_DM <~ 0.1 MeV. In particular, for
energy-independent scattering we obtain sigma[DM-proton] <~ 10^(-24) cm^2
(keV/m_DM)^(1/2), sigma[DM-electron] <~ 10^(-27) cm^2 (keV/m_DM)^(1/2) and
sigma[DM-photon] <~ 10^(-39) cm^2 (m_DM/keV). An experiment with the
characteristics of PIXIE would extend the regime of sensitivity up to masses
m_DM ~ 1 GeV.

15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn