Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Smearing orientifolds in flux compactifications can be OK   We present explicit examples of supergravity solutions corresponding to
backreacting localised (non-intersecting) O6 planes in flux reductions of
massive IIA supergravity and address some criticism towards the very existence
of such solutions. We verify in detail how the smeared orientifold solution
becomes a good approximation to the localised solution in the large volume/weak
coupling limit, as expected. We also find an exotic solution where prior to
backreaction the internal space has a boundary and when backreaction is
included the boundary disappears and the space closes off. The exotic example
is however outside of the supergravity approximation everywhere.

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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
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The categories of this paper are: q-bio
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The categories of this paper are: physics
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The categories of this paper are: econ
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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-ph