Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraints on Mirror Models of Dark Matter from Observable
  Neutron-Mirror Neutron Oscillation   The process of neutron-mirror neutron oscillation, motivated by symmetric
mirror dark matter models, is governed by two parameters: $n-n'$ mixing
parameter $\delta$ and $n-n'$ mass splitting $\Delta$. For neutron mirror
neutron oscillation to be observable, the splitting between their masses
$\Delta$ must be small and current experiments lead to $\delta \leq 2\times
10^{-27}$ GeV and$\Delta \leq 10^{-24}$ GeV. We show that in mirror universe
models where this process is observable, this small mass splitting constrains
the way that one must implement asymmetric inflation to satisfy the limits of
Big Bang Nucleosynthesis on the number of effective light degrees of freedom.
In particular we find that if asymmetric inflation is implemented by inflaton
decay to color or electroweak charged particles, the oscillation is
unobservable. Also if one uses SM singlet fields for this purpose, they must be
weakly coupled to the SM fields.

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The categories of this paper are: gr-qc
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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: physics
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The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex
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The categories of this paper are: astro-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: cs