Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Metastable Defects in Generic Extensions of the Standard Model   The main features of the recently found classically stable quasi-topological
membranes and strings in generic, topologically trivial and weakly coupled
two-Higgs extensions of the standard model are briefly reviewed. A variety of
localized solutions in the same model are also presented.

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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: supr-con
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th
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The categories of this paper are: stat
5
The categories of this paper are: gr-qc
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The categories of this paper are: nlin
2
The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
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The categories of this paper are: eess