Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Merging Heterotic Orbifolds and K3 Compactifications with Line Bundles   We clarify the relation between six-dimensional Abelian orbifold
compactifications of the heterotic string and smooth heterotic K3
compactifications with line bundles for both SO(32) and E_8 x E_8 gauge groups.
The T^4/Z_N cases for N=2,3,4 are treated exhaustively, and for N=6 some
examples are given. While all T^4/Z_2 and nearly all T^4/Z_3 models have a
simple smooth match involving one line bundle only, this is only true for some
T^4/Z_4 and T^4/Z_6 cases. We comment on possible matchings with more than one
line bundle for the remaining cases. The matching is provided by comparisons of
the massless spectra and their anomalies as well as a field theoretic analysis
of the blow-ups.

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The categories of this paper are: eess
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The categories of this paper are: q-alg
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The categories of this paper are: cs
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The categories of this paper are: patt-sol
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
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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: physics
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The categories of this paper are: nlin
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The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: math