Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Resolving conclusions about the early Universe requires accurate nuclear
  measurements   Nuclear physics experiments give reaction rates that, via modelling and
comparison with primordial abundances, constrain cosmological parameters. The
error bars of a key reaction, \dpg, were tightened in 2020, bringing to light
discrepancies between different analyses and calling for more accurate
measurements of other reactions.

25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org