Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Noncommutative Tachyons   When unstable Dp-branes in type II string theory are placed in a B-field, the
resulting tachyonic world-volume theory becomes noncommutative. We argue that
for large noncommutativity parameter, condensation of the tachyon as a
noncommutative soliton leads to new decay modes of the Dp-brane into
(p-2)-brane configurations, which we interpret as suitably smeared BPS
D(p-1)-branes. Some of these configurations are metastable. We discuss various
generalizations of this decay process.

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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: eess
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org
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The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
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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: chao-dyn
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The categories of this paper are: cs