Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: General relativistic accretion with backreaction   The spherically symmetric steady accretion of polytropic perfect fluids onto
a black hole is the simplest flow model that can demonstrate the effects of
backreaction. Backreaction keeps intact most of the characteristics of the
sonic point. For any such system the mass accretion rate achieves maximal value
when the mass of the fluid is 1/3 of the total mass. Fixing the total mass of
the system, one observes the existence of two weakly accreting regimes, one
overabundant and the other poor in fluid content.

21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph