Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Real topological string amplitudes   We discuss the physical superstring correlation functions in type I theory
(or equivalently type II with orientifold) that compute real topological string
amplitudes. We consider the correlator corresponding to holomorphic derivative
of the real topological amplitude $G_\chi$, at fixed worldsheet Euler
characteristic $\chi$. This corresponds in the low-energy effective action to
N=2 Weyl multiplet, appropriately reduced to the orientifold invariant part,
and raised to the power $g'=-\chi+1$. We show that the physical string
correlator gives precisely the holomorphic derivative of topological amplitude.
Finally, we apply this method to the standard closed oriented case as well, and
prove a similar statement for the topological amplitude $F_g$.

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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
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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: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: nlin
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The categories of this paper are: hep-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph