Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On cosmic natural selection   The rate of black hole formation can be increased by increasing the value of
the cosmological constant. This falsifies Smolin's conjecture that the values
of all constants of nature are adjusted to maximize black hole production.

28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat