Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraints on scattering of keV--TeV dark matter with protons in the
  early Universe   We present the first cosmological constraint on dark matter scattering with
protons in the early Universe for the entire range of dark matter masses
between 1 keV and 1 TeV. This constraint is derived from the Planck
measurements of the cosmic microwave background (CMB) temperature and
polarization anisotropy, and the CMB lensing anisotropy. It improves upon
previous CMB constraints by many orders of magnitude, where limits are
available, and closes the gap in coverage for low-mass dark matter candidates.
We focus on two canonical interaction scenarios: spin-independent and
spin-dependent scattering with no velocity dependence. Our results exclude
(with 95% confidence) spin-independent interactions with cross sections greater
than $5.3 \times 10^{-27}$ cm$^2$ for 1 keV, $3.0 \times 10^{-26}$ cm$^2$ for 1
MeV, $1.7 \times 10^{-25}$ cm$^2$ for 1 GeV, and $1.6 \times 10^{-23}$ cm$^2$
for 1 TeV dark matter mass. Finally, we discuss the implications of this study
for dark matter physics and future observations.

26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an