Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraints on Neutron-Mirror-Neutron Oscillation from Neutron Star
  Cooling   We address a method of limiting neutron-mirror neutron mixing ($\epsilon_{n
n'}$) by analyzing its effect on neutron star (NS) heating. This method employs
observational bounds on the surface temperature of NSs to constrain
$\epsilon_{n n'}$. The obtained bound is so stringent that it would exclude any
discovery of $n-n'$ oscillation by the planned terrestrial experiments.
Motivated by this last crucially important fact, we critically analyze this
suggestion and note a very interesting new effect present in nearly exact
mirror models, which significantly affect this bound. The new element in our
discussion is that in mirror models there is the $\beta$ decay $n' \to p'+ e'
+\bar{\nu}'_{e}$, which creates a cloud of mirror particles $n'$, $p'$, $e'$
and $D'$ inside the NS. The $e'$ can "rob" the energy generated by the $n \to
n'$ transition from the NS. This is achieved via $e-e'$ scattering enabled by
the presence of a (minute) milli-charge in mirror particles. This energy is
emitted as unobserved mirror photons via fast mirror bremsstrahlung. This will
lead to relaxing of the stringent bounds on $\epsilon_{nn'}$.

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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: math-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: physics
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The categories of this paper are: stat
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The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: econ