Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on Shadow and Non-Shadow Extensions of the Standard Model   The models in the two papers hep-ph/0608068 and hep-ph/0701254 by Chang et
al. with the so-called shadow gauge and scalar fields are nothing but
convenient tailored versions of our model in hep-th/0403039. The same remarks
applies to the work in hep-th/0612165 by Meissner and Nicolai.

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The categories of this paper are: nlin
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The categories of this paper are: alg-geom
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The categories of this paper are: physics
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The categories of this paper are: atom-ph
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The categories of this paper are: q-bio
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: cs
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The categories of this paper are: dg-ga