Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The COpernicus COmplexio: Statistical Properties of Warm Dark Matter
  Haloes   The recent detection of a 3.5 keV X-ray line from the centres of galaxies and
clusters by Bulbul et al. (2014a) and Boyarsky et al. (2014a) has been
interpreted as emission from the decay of 7 keV sterile neutrinos which could
make up the (warm) dark matter (WDM). As part of the COpernicus COmplexio
(COCO) programme, we investigate the properties of dark matter haloes formed in
a high-resolution cosmological $N$-body simulation from initial conditions
similar to those expected in a universe in which the dark matter consists of 7
keV sterile neutrinos. This simulation and its cold dark matter (CDM)
counterpart have $\sim13.4$bn particles, each of mass $\sim 10^5\, h^{-1}
M_\odot$, providing detailed information about halo structure and evolution
down to dwarf galaxy mass scales. Non-linear structure formation on small
scales ($M_{200}\, \leq\, 2 \times 10^9\,h^{-1}\,M_\odot$) begins slightly
later in COCO-Warm than in COCO-Cold. The halo mass function at the present day
in the WDM model begins to drop below its CDM counterpart at a mass $\sim 2
\times 10^{9}\,h^{-1}\,M_\odot$ and declines very rapidly towards lower masses
so that there are five times fewer haloes of mass $M_{200}=
10^{8}\,h^{-1}\,M_\odot$ in COCO-Warm than in COCO-Cold. Halo concentrations on
dwarf galaxy scales are correspondingly smaller in COCO-Warm, and we provide a
simple functional form that describes its evolution with redshift. The shapes
of haloes are similar in the two cases, but the smallest haloes in COCO-Warm
rotate slightly more slowly than their CDM counterparts.

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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: econ
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: physics
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The categories of this paper are: cond-mat
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ex