Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Skyrme Strings   We construct nontopological string solutions with U(1) Noether charge in the
Skyrme model with a pion mass term, and examine their stability by taking
linear perturbations. The solution exhibits a critical angular velocity beyond
which the configuration energetically prefers to decay by emitting pions. This
critical point is observed as a cusp in the relation between energy and charge.
We find that the maximum length for the string to be stable is comparable to
the size of one skyrmion. Beyond the length, it is unstable to decay. This
instability raises the possiblity of dynamical realization of Skyrme strings
from monopole strings inside a domain wall.

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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
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The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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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: ao-sci
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-ex