Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on "Is Dark Matter with Long-Range Interactions a Solution to
  All Small-Scale Problems of \Lambda CDM Cosmology?"   In Phys. Rev. Lett. 109 (2012) 231301, van den Aarssen et al. attempt to
solve all the small-scale structure problems in the cold-dark-matter scenario
by introducing interaction between the dark-matter particle and an MeV-mass
vector boson. In addition, the latter is coupled to ordinary neutrinos, and the
neutrino-vector boson coupling constant 10^{-5} < g_nu < 0.1 is required for
that purpose. We show that this dark-matter scenario is subject to restrictive
constraints from Big Bang Nucleosynthesis.

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The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom