Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transition from Established Stationary Vision of Black Holes to
  Never-Stationary Gravitational Collapse   The established concept of black hole emerged from several results founded on
Einstein's General Theory of Relativity. In this article, the relationship
between these results is analyzed, and it is pointed out how, in spite of being
individually correct, the sum of all them do not actually determine the
existence of black holes. Some logical incompatibilities in the standard Black
Hole model are put into evidence, and the alternative scheme of the
Never-Stationary Gravitational Collapse is defended. To illustrate the essence
of the new paradigm, a simple but conceptually complete toy model is worked out
and a qualitatively suitable metric for Never-Stationary Gravitational Collapse
is presented.

4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom