Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New Heterotic Non-Kahler Geometries   New heterotic torsional geometries are constructed as orbifolds of T^2
bundles over K3. The discrete symmetries considered can be freely-acting or
have fixed points and/or fixed curves. We give explicit constructions when the
base K3 is Kummer or algebraic. The orbifold geometries can preserve N=1,2
supersymmetry in four dimensions or be non-supersymmetric.

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The categories of this paper are: patt-sol
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The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: econ
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The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: cond-mat
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The categories of this paper are: nlin
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The categories of this paper are: ao-sci