Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dark Matter as an active gravitational agent in cloud complexes   We study the effect that the dark matter background (DMB) has on the
gravitational energy content and, in general, on the star formation efficiency
of a molecular cloud (MC). We first analyze the effect that a dark matter halo,
described by the Navarro et al. (1996) density profile, has on the energy
budget of a spherical, homogeneous, cloud located at different distances from
the halo center. We found that MCs located in the innermost regions of a
massive galaxy can feel a contraction force greater than their self-gravity due
to the incorporation of the potential of the galaxy's dark matter halo. We also
calculated analytically the gravitational perturbation that a MC produces over
a uniform DMB (uniform at the scales of a MC) and how this perturbation will
affect the evolution of the MC itself. The study shows that the star formation
in a MC will be considerably enhanced if the cloud is located in a dense and
low velocity dark matter environment. We confirm our results by measuring the
star formation efficiency in numerical simulations of the formation and
evolution of MCs within different DMBs. Our study indicates that there are
situations where the dark matter's gravitational contribution to the evolution
of the molecular clouds should not be neglected.

11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
16
The categories of this paper are: stat