Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: D-brane and Gauge Invariance in Closed String Field Theory   We construct a system of bosonic closed string field theory coupled to a
D-brane. The interaction between the D-brane and closed string field is
introduced using the boundary state which is a function of constant field
strength $F_{\mu\nu}$ and the tilt $\theta_\mu^i$ of the D-brane. We find that
the gauge invariance requirement on the system determines the
$(F_{\mu\nu},\theta_\mu^i)$-dependence of the normalization factor of the
boundary state as well as the form of the purely $(F_{\mu\nu},\theta_\mu^i)$
term of the action. Correspondence between the action in the present formalism
and the low energy effective action (bulk + D-brane actions) in the
$\sigma$-model approach is studied.

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The categories of this paper are: q-bio
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The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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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: comp-gas
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The categories of this paper are: hep-lat
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: math-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: econ
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The categories of this paper are: plasm-ph