Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generation and Acceleration of Jets from Effective Boundary Layer around
  Black Hole   We propose the processes of generation and radiative acceleration of jets
from the centrifugal pressure dominated boundary layer around a black hole.

18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics