Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Boundary States in B-Field Background   We consider the boundary states which describe D-branes in a constant B-field
background. We show that the two-form field Phi, which interpolates commutative
and noncommutative descriptions of D-branes, can be interpreted as the
invariant field strength in the T-dual picture. We also show that the extended
algebra parametrized by theta and Phi naturally appears as the commutation
relations of the original and the T-dual coordinates.

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The categories of this paper are: ao-sci
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: cs
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The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys