Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Aichelburg-Sexl Boost of Domain-Walls and Cosmic Strings   We consider the application of the Aichelburg-Sexl boost to plane and line
distributions of matter. Our analysis shows that for a domain wall the
space-time after the boost is flat except on a null hypersurface which is the
history of a null shell. For a cosmic string we study the influence of the
boost on the conical singularity and give the new value of the conical deficit.

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The categories of this paper are: cond-mat
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The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
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The categories of this paper are: stat
34
The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: nlin
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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol