Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Composite-kink solutions of coupled nonlinear wave equations   We obtain exact traveling-wave solutions of the coupled nonlinear partial
differential equations that describe the dynamics of two classical scalar
fields in 1+1 dimensions. The solutions are kinks interpolating between
neighboring vacua. We compute the classical kink mass and show that it
saturates a Bogomol'nyi-type bound. We also present exact traveling-wave
solutions of a more general class of models. Examples include coupled $\phi^4$
and sine-Gordon models.

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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol