Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum stabilization of Z-strings in the electroweak model   We study the quantum energy of the Z-string in 2+1 dimensions using the phase
shift formalism. Our main interest is the question of stability of a Z-string
carrying a finite fermion number.

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The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: cs
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-ph
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The categories of this paper are: math
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess