Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A general relativistic effect in quasi-spherical objects as the possible
  origin of relativistic jets   Based on recently reported results, we present arguments that sign changes in
proper acceleration of test particles on the symmetry axis and close to the
r=2M surface of quasi-spherical objects - related to the quadrupole moment of
the source - might be at the origin of relativistic jets of quasars and
micro-quasars.

10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math