Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Skyrmions and Faddeev-Hopf Solitons   This paper describes a natural one-parameter family of generalized Skyrme
systems, which includes the usual SU(2) Skyrme model and the Skyrme-Faddeev
system. Ordinary Skyrmions resemble polyhedral shells, whereas the Hopf-type
solutions of the Skyrme-Faddeev model look like closed loops, possibly linked
or knotted. By looking at the minimal-energy solutions in various topological
classes, and for various values of the parameter, we see how the polyhedral
Skyrmions deform into loop-like Hopf Skyrmions.

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The categories of this paper are: cond-mat
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The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
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The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th
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The categories of this paper are: math
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The categories of this paper are: cs
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The categories of this paper are: hep-ex