Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Orbifolds of Permutation-Type as Physical String Systems at
  Multiples of c=26 II. The Twisted BRST Systems of \hatc=52 Matter   This is the second in a series of papers which consider the orbifolds of
permutation-type as candidates for new physical string systems at higher
central charge. In the first paper, I worked out the extended actions of the
twisted sectors of these orbifolds -- which exhibit new permutation-twisted
world-sheet gravities and correspondingly extended diffeomorphism groups. In
this paper I begin the study of these systems as operator string theories,
limiting the discussion for simplicity to the strings with ${\hat c} = 52$
matter (which are those governed by ${\mathbb Z}_2$-twisted permutation
gravity). In particular, I present here a construction of the twisted
reparametrization ghosts and {\em new twisted BRST systems} of all ${\hat c} =
52$ strings. The twisted BRST systems also imply new {\em extended physical
state conditions}, whose analysis for individual ${\hat c} = 52$ strings is
deferred to the next paper of the series.

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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: astro-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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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: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: supr-con
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The categories of this paper are: funct-an
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The categories of this paper are: cond-mat
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The categories of this paper are: nlin