Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chiral Supersymmetric Standard Model Spectra from Orientifolds of Gepner
  Models   We construct d=4,N=1 orientifolds of Gepner models with just the chiral
spectrum of the standard model. We consider all simple current modular
invariants of c=9 tensor products of N=2 minimal models. For some very specific
tensor combinations, and very specific modular invariants and orientifold
projections, we find a large number of such spectra. We allow for standard
model singlet (dark) matter and non-chiral exotics. The Chan-Paton gauge group
is either U(3) x Sp(2) x U(1) x U(1) or U(3) x U(2) x U(1) x U(1). In many
cases the standard model hypercharge U(1) has no coupling to RR 2-forms and
hence remains massless; in some of those models the B-L gauge boson does
acquire a mass.

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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: astro-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: econ
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The categories of this paper are: cs
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The categories of this paper are: math