Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: String Theory and the Dark Glueball Problem   We study cosmological constraints on dark pure Yang-Mills sectors. Dark
glueballs are overproduced for large regions of ultraviolet parameter space.
The problem may be alleviated in two ways: via a large preferential reheating
into the visible sector, motivating certain inflation or modulus decay models,
or via decays into axions or moduli, which are strongly constrained by
nucleosynthesis and $\Delta N_{\text{eff}}$ bounds. String models frequently
have multiple hidden Yang-Mills sectors, which are subject to even stronger
constraints due to the existence of multiple dark glueballs.

25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
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The categories of this paper are: eess
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat