Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Can higher order curvature theories explain rotation curves of galaxies?   Higher order curvature gravity has recently received a lot of attention due
to the fact that it gives rise to cosmological models which seem capable of
solving dark energy and quintessence issues without using "ad hoc" scalar
fields. In this letter, a gravitational potential is obtained which differs
from the Newtonian one because of a repulsive correction increasing with
distance. We evaluate the rotation curve of our Galaxy and compare it with the
observed data in order both to test the viability of these theories and to
estimate the scalelength of the correction. It is remarkable that the Milky Way
rotation curve is well fitted without the need of any dark matter halo and a
similar result tentatively holds also for other galaxies.

27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol