Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Attached Open Strings on a D$p$-brane in the Backgrounds of the pp-wave
  and Linear Dilation   Open strings on a D$p$-brane in the pp-wave spacetime, accompanied by a
linear dilaton background, will be studied. Various properties of this system
such as solvability of equations of motion and quantization will be
investigated.

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The categories of this paper are: cond-mat
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs