Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A stealth defect of spacetime   We discuss a special type of Skyrmion spacetime-defect solution, which has a
positive energy density of the matter fields but a vanishing asymptotic
gravitational mass. With a mass term for the matter field added to the action
(corresponding to massive "pions" in the Skyrme model), this particular
soliton-type solution has no long-range fields and can appropriately be called
a "stealth defect."

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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ph
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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: physics
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The categories of this paper are: hep-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: astro-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: patt-sol
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The categories of this paper are: cmp-lg
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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: q-fin