Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Compact objects and Black Holes: Nobel Prize for Physics 2020   The Nobel Prize in Physics 2020 has been divided, one half awarded to Roger
Penrose for the discovery that black hole formation is a robust prediction of
the general theory of relativity. and the other half jointly to Reinhard Genzel
and Andrea Ghez for the discovery of a supermassive compact object at the
centre of our galaxy. Here we describe their work and put it in historical
context and discuss specific advances that have been rewarded.

6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph