Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Astro2020 Science White Paper: Fundamental Physics with Brown Dwarfs:
  The Mass-Radius Relation   The lowest-mass stars, brown dwarfs and giant exoplanets span a minimum in
the mass-radius relationship that probes the fundamental physics of extreme
states of matter, magnetism, and fusion. This White Paper outlines scientific
opportunities and the necessary resources for modeling and measuring the
mass-radius relationship in this regime.

28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci