Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Expanding Universe and Dynamical Compactification Using Yang-Mills
  Instantons   We consider an eight-dimensional Einstein-Yang-Mills theory to explore
whether Yang-Mills instantons formed in extra dimensions can induce the
dynamical instability of our four-dimensional spacetime. We show that the
Yang-Mills instantons in extra dimensions can trigger the expansion of our
universe in four-dimensional spacetime as well as the dynamical
compactification of extra dimensions. We also discuss a possibility to realize
a reheating mechanism via the quantum back-reaction from the contracting tiny
internal space with a smeared instanton.

28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
3
The categories of this paper are: physics
18
The categories of this paper are: econ