Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A correlation between the amount of dark matter in elliptical galaxies
  and their shape   We discuss the correlation between the dark matter content of elliptical
galaxies and their ellipticities. We then explore a mechanism for which the
correlation would emerge naturally. Such mechanism leads to identifying the
dark matter particles to gravitons. A similar mechanism is known in Quantum
Chromodynamics (QCD) and is essential to our understanding of the mass and
structure of baryonic matter.

18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn