Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A black hole solution to the cosmological monopole problem   We propose a solution to the cosmological monopole problem: Primordial black
holes, produced in the early universe, can accrete magnetic monopoles before
the relics dominate the energy density of the universe. These small black holes
quickly evaporate and thereby convert most of the monopole energy density into
radiation. We estimate the range of parameters for which this solution is
possible: under very conservative assumptions we find that the black hole mass
must be less than 10^9 gm.

9
The categories of this paper are: nlin
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph