Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the possibility of observation of the future for movement in the
  field of black holes of different types   It is shown for a spherically symmetric black hole of general type that it is
impossible to observe the infinite future of the Universe external to the hole
during the finite proper time interval of the free fall. Quantitative
evaluations of the effect of time dilatation for circular orbits around the
Kerr black hole are obtained and it is shown that the effect is essential for
ultrarelativistic energies of the rotating particle.

30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int