Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neutron injection during primordial nucleosynthesis alleviates the
  primordial 7Li problem   We present a parametrized study of the effects of free thermal neutron
injection on primordial nucleosynthesis, where both the rate and the time scale
of injection are varied. This generic approach is found to yield a successful
solution for reducing the 7Li abundance without causing significant problems to
other elemental abundances. Our analysis demonstrates that hadronic injection,
possibly due to decays or annihilations of dark matter particles with a mass of
about 1 to 30 GeV, provides a possible solution to an outstanding problem in
the standard Big Bang model.

16
The categories of this paper are: stat
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess