Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Einstein Static Universe in Exponential $f(T)$ Gravity   We analyze the stability of the Einstein static closed and open universe in
two types of exponential $f(T)$ gravity theories. We show that the stable
solutions exist in these two models. In particular, we find that large regions
of parameter space in equation of state $w=p/\rho$ for the stable universe are
allowed in the $f(T)$ theories.

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The categories of this paper are: hep-th
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The categories of this paper are: cs
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex