Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detection of CDM Substructure   The properties of multiple image gravitational lenses require a fractional
surface mass density in satellites of f=0.02 (0.006 < f < 0.07 at 90%
confidence) that is consistent with the expectations for CDM. The
characteristic satellite mass scale, 10^6-10^9 Msun, is also consistent with
the expectations for CDM. The agreement between the observed and expected
density of CDM substructure shows that most low mass galactic satellites fail
to form stars, and this absence of star formation explains the discrepancy
between the number of observed Galactic satellites and CDM predictions rather
than any modification to the CDM theory such as self-interacting dark matter or
a warm dark matter component.

26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph