Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Occurrence of a turning point in the dynamic solution for a
  Reissner-Nordstr\"om black hole   A self-consistent exact solution for a Reissner-Nordstr\"om black-and-white
hole formed as a result of accretion has been considered. Prior to the
formation of a black-and-white hole, there is a bulk charged sphere at the
center of the system. The occurrence of a turning (bounce) point in the newly
formed black-and-white hole is investigated. The occurrence of a turning point
was investigated by an example of solution for the accretion of a neutral
spherical dust shell. The model equations are written with allowance for the
cosmological $\Lambda$-term. Within the model under consideration, both the
black-and-white hole and its turning point are formed in the already existing
Universe; therefore, the black-and-white hole in this model is not <<eternal>>.

19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci